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Version: 8.1

MSSQL and PostgreSQL script examples

Level: intermediate

Example 1 (views)​

Example

Example of an SQL script that creates a view and triggers to add, modify, and delete records from the target table.

-- View and triggers that let you modify the target table
-- MSSQL
IF EXISTS (SELECT * FROM sys.views WHERE object_id = OBJECT_ID(N'[dbo].[VwSysAdminUnit]'))
DROP VIEW [dbo].[VwSysAdminUnit]
GO
CREATE VIEW [dbo].[VwSysAdminUnit]
AS
SELECT [SysAdminUnit].[Id]
    ,[SysAdminUnit].[CreatedOn]
    ,[SysAdminUnit].[CreatedById]
    ,[SysAdminUnit].[ModifiedOn]
    ,[SysAdminUnit].[ModifiedById]
    ,[SysAdminUnit].[Name]
    ,[SysAdminUnit].[Description]
    ,[SysAdminUnit].[ParentRoleId]
    ,[SysAdminUnit].[ContactId]
    ,[SysAdminUnit].[IsDirectoryEntry]
    ,[TimeZone].[Id] AS [TimeZoneId]
    ,[SysAdminUnit].[UserPassword]
    ,[SysAdminUnitType].[Id] AS [SysAdminUnitTypeId]
    ,[SysAdminUnit].[AccountId]
    ,[SysAdminUnit].[Active]
    ,[SysAdminUnit].[LoggedIn]
    ,[SysAdminUnit].[SynchronizeWithLDAP]
    ,[SysAdminUnit].[LDAPEntry]
    ,[SysAdminUnit].[LDAPEntryId]
    ,[SysAdminUnit].[LDAPEntryDN]
    ,[SysAdminUnit].[SysCultureId]
    ,[SysAdminUnit].[ProcessListeners]
    ,[SysAdminUnit].[PasswordExpireDate]
    ,[SysAdminUnit].[HomePageId]
    ,[SysAdminUnit].[ConnectionType]
    ,[ConnectionType].[Id] AS [UserConnectionTypeId]
    ,[SysAdminUnit].[ForceChangePassword]
    ,[SysAdminUnit].[DateTimeFormatId]
    ,[SysAdminUnit].[Id] as [SysAdminUnitId]
    ,[SysAdminUnit].[SessionTimeout] as [SessionTimeout]
FROM [SysAdminUnit]
INNER JOIN [SysAdminUnitType] ON [SysAdminUnitType].[Value] = [SysAdminUnit].[SysAdminUnitTypeValue]
LEFT JOIN [ConnectionType] AS [ConnectionType] ON [ConnectionType].[Value] = [SysAdminUnit].[ConnectionType]
LEFT JOIN [TimeZone] AS [TimeZone] ON [TimeZone].[Code] = [SysAdminUnit].[TimeZoneId]
GO
CREATE TRIGGER [dbo].[ITR_VwSysAdminUnit_I]
ON [dbo].[VwSysAdminUnit]
    INSTEAD OF INSERT
AS
BEGIN
SET NOCOUNT ON;
INSERT INTO [SysAdminUnit](
    [Id]
    ,[CreatedOn]
    ,[CreatedById]
    ,[ModifiedOn]
    ,[ModifiedById]
    ,[Name]
    ,[Description]
    ,[ParentRoleId]
    ,[ContactId]
    ,[IsDirectoryEntry]
    ,[TimeZoneId]
    ,[UserPassword]
    ,[SysAdminUnitTypeValue]
    ,[AccountId]
    ,[Active]
    ,[LoggedIn]
    ,[SynchronizeWithLDAP]
    ,[LDAPEntry]
    ,[LDAPEntryId]
    ,[LDAPEntryDN]
    ,[SysCultureId]
    ,[ProcessListeners]
    ,[PasswordExpireDate]
    ,[HomePageId]
    ,[ConnectionType]
    ,[ForceChangePassword]
    ,[DateTimeFormatId]
    ,[SessionTimeout])
SELECT [Id]
    ,[CreatedOn]
    ,[CreatedById]
    ,[ModifiedOn]
    ,[ModifiedById]
    ,[Name]
    ,[Description]
    ,[ParentRoleId]
    ,[ContactId]
    ,[IsDirectoryEntry]
    ,(SELECT COALESCE(
        (SELECT [TimeZone].[Code] FROM [TimeZone]
            WHERE [TimeZone].[Id] = [INSERTED].[TimeZoneId]), ''))
    ,[UserPassword]
    ,ISNULL((SELECT [SysAdminUnitType].[Value] FROM [SysAdminUnitType]
        WHERE [SysAdminUnitType].[Id] = [INSERTED].[SysAdminUnitTypeId]), 4)
    ,[AccountId]
    ,[Active]
    ,ISNULL([LoggedIn], 0)
    ,[SynchronizeWithLDAP]
    ,[LDAPEntry]
    ,[LDAPEntryId]
    ,[LDAPEntryDN]
    ,[SysCultureId]
    ,[ProcessListeners]
    ,[PasswordExpireDate]
    ,[HomePageId]
    ,COALESCE([INSERTED].[ConnectionType],
        (SELECT [ConnectionType].[Value] FROM [ConnectionType]
        WHERE [ConnectionType].[Id] = [INSERTED].[UserConnectionTypeId]), 0)
    ,ISNULL([ForceChangePassword], 0)
    ,[DateTimeFormatId]
    ,[SessionTimeout]
FROM [INSERTED]
END
GO
CREATE TRIGGER [dbo].[ITR_VwSysAdminUnit_U]
ON [dbo].[VwSysAdminUnit]
    INSTEAD OF UPDATE
AS
BEGIN
SET NOCOUNT ON;
UPDATE [SysAdminUnit]
SET [SysAdminUnit].[CreatedOn] = [INSERTED].[CreatedOn]
    ,[SysAdminUnit].[CreatedById] = [INSERTED].[CreatedById]
    ,[SysAdminUnit].[ModifiedOn] =[INSERTED].[ModifiedOn]
    ,[SysAdminUnit].[ModifiedById] = [INSERTED].[ModifiedById]
    ,[SysAdminUnit].[Name] = [INSERTED].[Name]
    ,[SysAdminUnit].[Description] = [INSERTED].[Description]
    ,[SysAdminUnit].[ParentRoleId] = [INSERTED].[ParentRoleId]
    ,[SysAdminUnit].[ContactId] = [INSERTED].[ContactId]
    ,[SysAdminUnit].[IsDirectoryEntry] = [INSERTED].[IsDirectoryEntry]
    ,[SysAdminUnit].[TimeZoneId] =
        (SELECT COALESCE(
            (SELECT [TimeZone].[Code] FROM [TimeZone]
                WHERE [TimeZone].[Id] = [INSERTED].[TimeZoneId]), ''))
    ,[SysAdminUnit].[UserPassword] = [INSERTED].[UserPassword]
    ,[SysAdminUnit].[SysAdminUnitTypeValue] =
        (SELECT [SysAdminUnitType].[Value] FROM [SysAdminUnitType]
            WHERE [SysAdminUnitType].[Id] = [INSERTED].[SysAdminUnitTypeId])
    ,[SysAdminUnit].[AccountId] = [INSERTED].[AccountId]
    ,[SysAdminUnit].[Active] = [INSERTED].[Active]
    ,[SysAdminUnit].[LoggedIn] = [INSERTED].[LoggedIn]
    ,[SysAdminUnit].[SynchronizeWithLDAP] = [INSERTED].[SynchronizeWithLDAP]
    ,[SysAdminUnit].[LDAPEntry] = [INSERTED].[LDAPEntry]
    ,[SysAdminUnit].[LDAPEntryId] = [INSERTED].[LDAPEntryId]
    ,[SysAdminUnit].[LDAPEntryDN] = [INSERTED].[LDAPEntryDN]
    ,[SysAdminUnit].[SysCultureId] = [INSERTED].[SysCultureId]
    ,[SysAdminUnit].[ProcessListeners] = [INSERTED].[ProcessListeners]
    ,[SysAdminUnit].[PasswordExpireDate] = [INSERTED].[PasswordExpireDate]
    ,[SysAdminUnit].[HomePageId] = [INSERTED].[HomePageId]
    ,[SysAdminUnit].[ConnectionType] = COALESCE([INSERTED].[ConnectionType],
        (SELECT [ConnectionType].[Value] FROM [ConnectionType]
        WHERE [ConnectionType].[Id] = [INSERTED].[UserConnectionTypeId]), 0)
    ,[SysAdminUnit].[ForceChangePassword] = [INSERTED].[ForceChangePassword]
    ,[SysAdminUnit].[DateTimeFormatId] = [INSERTED].[DateTimeFormatId]
    ,[SysAdminUnit].[SessionTimeout] = [INSERTED].[SessionTimeout]
FROM [SysAdminUnit]
INNER JOIN [INSERTED] ON [SysAdminUnit].[Id] = [INSERTED].[Id]
END
GO
CREATE TRIGGER [dbo].[ITR_VwSysAdminUnit_D]
ON [dbo].[VwSysAdminUnit]
    INSTEAD OF DELETE
AS
BEGIN
SET NOCOUNT ON;
DELETE FROM [SysAdminUnit]
WHERE EXISTS(SELECT * FROM [DELETED] WHERE [SysAdminUnit].[Id] = [DELETED].[Id])
END
GO

Example 2 (views)​

Example

Example of an SQL script that demonstrates how to use a RULE instead of the INSTEAD OF trigger in PostgreSQL.

-- Use the RULE instead of the INSTEAD OF trigger
-- MSSQL
IF EXISTS (SELECT * FROM sys.views WHERE object_id = OBJECT_ID(N'[dbo].[VwAdministrativeObjects]'))
DROP VIEW [dbo].[VwAdministrativeObjects]
GO
CREATE VIEW [dbo].[VwAdministrativeObjects]
AS
WITH
[SysSchemaAdministrationProperties] AS (
SELECT [AdministrationPropertiesAll].[Id] AS [SysSchemaId],
    max([AdministrationPropertiesAll].[AdministratedByOperations]) AS [AdministratedByOperations],
    max([AdministrationPropertiesAll].[AdministratedByColumns]) AS [AdministratedByColumns],
    max([AdministrationPropertiesAll].[AdministratedByRecords]) AS [AdministratedByRecords],
    max([AdministrationPropertiesAll].[IsTrackChangesInDB]) AS [IsTrackChangesInDB]
FROM (
    SELECT [SysSchema].[Id],
            (CASE WHEN EXISTS (
                SELECT 1
                FROM [SysSchemaProperty]
                WHERE (([SysSchemaProperty].[SysSchemaId] = [SysSchema].[Id] AND [SysSchema].[ExtendParent] = 0)
                    OR [SysSchemaProperty].[SysSchemaId] = [DerivedSysSchema].[Id])
                    AND [SysSchemaProperty].[Name] = 'AdministratedByOperations'
                    AND [SysSchemaProperty].[Value] = 'True'
                    AND [SysSchemaProperty].[SysSchemaId] IS NOT NULL
                )
            THEN 1 ELSE 0 END) AS [AdministratedByOperations],
            (CASE WHEN EXISTS (
                SELECT 1
                FROM [SysSchemaProperty]
                WHERE (([SysSchemaProperty].[SysSchemaId] = [SysSchema].[Id] AND [SysSchema].[ExtendParent] = 0)
                    OR [SysSchemaProperty].[SysSchemaId] = [DerivedSysSchema].[Id])
                    AND [SysSchemaProperty].[Name] = 'AdministratedByColumns'
                    AND [SysSchemaProperty].[Value] = 'True'
                    AND [SysSchemaProperty].[SysSchemaId] IS NOT NULL
                )
            THEN 1 ELSE 0 END) AS [AdministratedByColumns],
            (CASE WHEN EXISTS (
                SELECT 1
                FROM [SysSchemaProperty]
                WHERE (([SysSchemaProperty].[SysSchemaId] = [SysSchema].[Id] AND [SysSchema].[ExtendParent] = 0)
                    OR [SysSchemaProperty].[SysSchemaId] = [DerivedSysSchema].[Id])
                    AND [SysSchemaProperty].[Name] = 'AdministratedByRecords'
                    AND [SysSchemaProperty].[Value] = 'True'
                    AND [SysSchemaProperty].[SysSchemaId] IS NOT NULL
                )
            THEN 1 ELSE 0 END) AS [AdministratedByRecords],
            (CASE WHEN EXISTS (
                SELECT 1
                FROM [SysSchemaProperty]
                WHERE (([SysSchemaProperty].[SysSchemaId] = [SysSchema].[Id] AND [SysSchema].[ExtendParent] = 0)
                    OR [SysSchemaProperty].[SysSchemaId] = [DerivedSysSchema].[Id])
                    AND [SysSchemaProperty].[Name] = 'IsTrackChangesInDB'
                    AND [SysSchemaProperty].[Value] = 'True'
                    AND [SysSchemaProperty].[SysSchemaId] IS NOT NULL
                )
            THEN 1 ELSE 0 END) AS [IsTrackChangesInDB]
    FROM [SysSchema]
    LEFT OUTER JOIN [SysSchema] AS [DerivedSysSchema] ON ([SysSchema].[Id] = [DerivedSysSchema].[ParentId] AND [DerivedSysSchema].[ExtendParent] = 1)
    WHERE [SysSchema].[ManagerName] = 'EntitySchemaManager'
        AND [SysSchema].[ExtendParent] = 0
) AS [AdministrationPropertiesAll]
GROUP BY [AdministrationPropertiesAll].[Id]
)
SELECT [BaseSchemas].[UId] AS [Id],
    [BaseSchemas].[UId],
    [BaseSchemas].[CreatedOn],
    [BaseSchemas].[CreatedById],
    [BaseSchemas].[ModifiedOn],
    [BaseSchemas].[ModifiedById],
    [BaseSchemas].[Name],
    [VwSysSchemaExtending].[TopExtendingCaption] as Caption,
    [BaseSchemas].[Description],
    (CASE WHEN EXISTS (
        SELECT 1
        FROM [SysLookup]
        WHERE [SysLookup].[SysEntitySchemaUId] = [BaseSchemas].[UId])
        THEN 1 ELSE 0 END) AS [IsLookup],
    (CASE WHEN EXISTS (
        SELECT 1 FROM [SysModule]
        INNER JOIN [SysModuleEntity] ON [SysModuleEntity].[Id] = [SysModule].[SysModuleEntityId]
        WHERE [BaseSchemas].[UId] = [SysModuleEntity].[SysEntitySchemaUId])
        THEN 1 ELSE 0 END) AS [IsModule],
    [SysSchemaAdministrationProperties].[AdministratedByOperations],
    [SysSchemaAdministrationProperties].[AdministratedByColumns],
    [SysSchemaAdministrationProperties].[AdministratedByRecords],
    [SysSchemaAdministrationProperties].[IsTrackChangesInDB],
    [SysWorkspaceId],
    [BaseSchemas].[ProcessListeners],
    (CASE WHEN EXISTS (
        SELECT 1
        FROM [SysSSPEntitySchemaAccessList]
        WHERE [SysSSPEntitySchemaAccessList].[EntitySchemaUId] = [BaseSchemas].[UId]
        )
        THEN 1 ELSE 0 END) AS [IsInSSPEntitySchemaAccessList]
FROM  [SysSchema] as [BaseSchemas]
INNER JOIN [VwSysSchemaExtending] ON BaseSchemas.[Id] = [VwSysSchemaExtending].[BaseSchemaId]
INNER JOIN [SysPackage] on [BaseSchemas].[SysPackageId] = [SysPackage].[Id]
INNER JOIN [SysSchemaAdministrationProperties] ON [BaseSchemas].[Id] = [SysSchemaAdministrationProperties].[SysSchemaId]
GO
CREATE TRIGGER [dbo].[TRVwAdministrativeObjects_IU]
ON [dbo].[VwAdministrativeObjects]
    INSTEAD OF UPDATE
AS
BEGIN
    SET NOCOUNT ON;
    RETURN
END
GO

Example 3 (stored procedures)​

Example

Example of an SQL script that creates a stored procedure. The stored procedure uses loops, cursors, and temporary tables.

-- Stored procedure that uses loops, cursors, and temporary tables
-- MSSQL
IF NOT OBJECT_ID('[dbo].[tsp_ActualizeUserRoles]') IS NULL
BEGIN
    DROP PROCEDURE [dbo].[tsp_ActualizeUserRoles]
END
GO

CREATE PROCEDURE dbo.tsp_ActualizeUserRoles (@UserId uniqueidentifier)
AS
BEGIN
    SET NOCOUNT ON

    IF OBJECT_ID('tempdb..#AdminUnitListTemp') IS NOT NULL
    BEGIN
        DROP TABLE [#AdminUnitListTemp];
    END;
    CREATE TABLE [#AdminUnitListTemp] (
        [UserId] uniqueidentifier NOT NULL,
        [Id] uniqueidentifier NOT NULL,
        [Name] NVARCHAR(250) NOT NULL,
        [ParentRoleId] uniqueidentifier NULL,
        [Granted] BIT NULL
    );

    DECLARE @GetAdminUnitList TABLE (
        [Id] uniqueidentifier NOT NULL,
        [Name] nvarchar(260) NOT NULL,
        [ParentRoleId] uniqueidentifier NULL
    );
    DECLARE @NewRoles TABLE ([Id] uniqueidentifier NOT NULL);
    DECLARE @OldUserRoles TABLE ([Id] uniqueidentifier NOT NULL);

    DECLARE @getUserAdminUnits CURSOR;
    DECLARE @SysAdminUnitRoles TABLE (
        [Id] uniqueidentifier,
        [Name] nvarchar(260),
        [ParentRoleId] uniqueidentifier
    );
    DECLARE @ManagersBeforeActualization TABLE ([Id] uniqueidentifier NOT NULL);
    DECLARE @ManagersAfterActualization TABLE ([Id] uniqueidentifier NOT NULL);
    DECLARE @StillManagers TABLE ([Id] uniqueidentifier NOT NULL);
    DECLARE @NoLongerManagers TABLE ([Id] uniqueidentifier NOT NULL);
    DECLARE @NewManagers TABLE ([Id] uniqueidentifier NOT NULL);
    DECLARE @SysAdminUnitId uniqueidentifier;

    -- Old user roles
    INSERT INTO @OldUserRoles
        SELECT DISTINCT [SysAdminUnitInRole].[SysAdminUnitRoleId] [Id]
        FROM [SysAdminUnitInRole]
        WHERE [SysAdminUnitInRole].[SysAdminUnitId] = @UserId

    -- Old user managers
    INSERT INTO @ManagersBeforeActualization
        SELECT DISTINCT [SysUserInRole].[SysUserId] [Id]
        FROM [SysAdminUnitInRole]
        INNER JOIN [SysAdminUnit] [Roles]
            ON [SysAdminUnitInRole].[SysAdminUnitRoleId] = [Roles].[Id]
        INNER JOIN @OldUserRoles
            ON [Roles].[ParentRoleId] = [@OldUserRoles].[Id]
        INNER JOIN [SysUserInRole]
            ON [SysUserInRole].[SysRoleId] = [Roles].[Id]
        WHERE [Roles].[SysAdminUnitTypeValue] = 2

    -- Get and insert new user roles
    INSERT INTO @GetAdminUnitList EXEC [tsp_GetAdminUnitList] @UserId=@UserId;
    INSERT INTO @NewRoles SELECT [Id] FROM @GetAdminUnitList;
    DELETE FROM [SysAdminUnitInRole] WHERE [SysAdminUnitId] = @UserId;
    INSERT INTO [SysAdminUnitInRole] ([SysAdminUnitId], [SysAdminUnitRoleId])
        SELECT DISTINCT @UserId, [Id] FROM @NewRoles;

    -- User managers after actualization
    INSERT INTO @ManagersAfterActualization
        SELECT DISTINCT
            [SysUserInRole].[SysUserId] [Id]
        FROM [SysAdminUnitInRole]
        INNER JOIN [SysAdminUnit] [Roles]
            ON [SysAdminUnitInRole].[SysAdminUnitRoleId] = [Roles].[Id]
        INNER JOIN @NewRoles NewRoles
            ON [Roles].[ParentRoleId] = NewRoles.[Id]
        INNER JOIN [SysUserInRole]
            ON [SysUserInRole].[SysRoleId] = [Roles].[Id]
        WHERE [Roles].[SysAdminUnitTypeValue] = 2;

    -- New (who were not but become) user managers
    INSERT INTO @NewManagers
        SELECT [Id] FROM @ManagersAfterActualization AS managersAfterActualization
            WHERE NOT EXISTS (
                SELECT NULL
                FROM @ManagersBeforeActualization AS managersBeforeActualization
                WHERE managersBeforeActualization.[Id] = managersAfterActualization.[Id]
            );

    -- Add all user roles to new managers and their grantee-users, if they arent already have
    SET @getUserAdminUnits = CURSOR FOR
        SELECT DISTINCT [Id] FROM (
            SELECT [Id] FROM @NewManagers
            UNION
            SELECT [GranteeSysAdminUnitId]
            FROM [SysAdminUnitGrantedRight]
            WHERE EXISTS (
                SELECT NULL FROM @NewManagers as newManagers
                WHERE [SysAdminUnitGrantedRight].[GrantorSysAdminUnitId] = newManagers.[Id]
            )
        ) Roles;

    OPEN @getUserAdminUnits;
    FETCH NEXT
    FROM @getUserAdminUnits INTO @SysAdminUnitId;
    WHILE @@FETCH_STATUS = 0
    BEGIN
        INSERT INTO [SysAdminUnitInRole] ([SysAdminUnitId], [SysAdminUnitRoleId])
            SELECT DISTINCT @SysAdminUnitId, [Id]
            FROM @NewRoles AS newRoles
            WHERE NOT EXISTS (
                SELECT 1
                FROM [SysAdminUnitInRole]
                WHERE [SysAdminUnitInRole].[SysAdminUnitId] = @SysAdminUnitId
                AND [SysAdminUnitInRole].[SysAdminUnitRoleId] = newRoles.[Id]
            );
        FETCH NEXT FROM @getUserAdminUnits INTO @SysAdminUnitId;
    END;
    CLOSE @getUserAdminUnits;
    DEALLOCATE @getUserAdminUnits;

    DECLARE @isUserLostAtLeastOneRole INT = (
        SELECT COUNT(*)
        FROM @OldUserRoles AS oldUserRoles
        WHERE NOT EXISTS (
            SELECT 1
            FROM @NewRoles AS newUserRoles
            WHERE newUserRoles.[Id] = oldUserRoles.[Id]
        )
    );

    -- Still (who were and remained) user managers
    INSERT INTO @StillManagers
        SELECT  DISTINCT managersAfterActualization.[Id] AS [Id]
        FROM @ManagersAfterActualization AS managersAfterActualization
            JOIN @ManagersBeforeActualization AS managersBeforeActualization
                ON managersAfterActualization.[Id] = managersBeforeActualization.[Id];

    -- If user lost at least one role, we need to actualize all his still-managers.
    -- If not (user only gained new roles) - we just add to still-managers and their grantee-users new user roles.
    IF (@isUserLostAtLeastOneRole = 0)
    BEGIN
        -- Add all new user roles to his still-managers and to their grantee-users
        SET @getUserAdminUnits = CURSOR FOR
            SELECT DISTINCT [Id] FROM (
                SELECT stillManagers.[Id] AS [Id]
                FROM @StillManagers AS stillManagers
                UNION
                SELECT [GranteeSysAdminUnitId]
                FROM [SysAdminUnitGrantedRight]
                WHERE EXISTS (
                    SELECT NULL
                    FROM @StillManagers AS stillManagers
                    WHERE stillManagers.[Id] = [GrantorSysAdminUnitId]
                )
            ) Roles;

        OPEN @getUserAdminUnits;
        FETCH NEXT
        FROM @getUserAdminUnits INTO @SysAdminUnitId;
        WHILE @@FETCH_STATUS = 0
        BEGIN
            INSERT INTO [SysAdminUnitInRole] ([SysAdminUnitId], [SysAdminUnitRoleId])
                SELECT DISTINCT @SysAdminUnitId, [Id]
                FROM @NewRoles AS newRoles
                WHERE NOT EXISTS (
                    SELECT 1
                    FROM [SysAdminUnitInRole]
                    WHERE [SysAdminUnitInRole].[SysAdminUnitId] = @SysAdminUnitId
                        AND [SysAdminUnitInRole].[SysAdminUnitRoleId] = newRoles.[Id]
                );
            FETCH NEXT FROM @getUserAdminUnits INTO @SysAdminUnitId;
        END;
        CLOSE @getUserAdminUnits;
        DEALLOCATE @getUserAdminUnits;
    END ELSE
    BEGIN
        --Actualize all roles for still-managers
        SET @getUserAdminUnits = CURSOR FOR
            SELECT DISTINCT [Id]
            FROM @StillManagers
            UNION
                SELECT [GranteeSysAdminUnitId]
                FROM [SysAdminUnitGrantedRight]
                WHERE EXISTS (
                SELECT NULL
                FROM @StillManagers AS stillManagers
                WHERE stillManagers.[Id] = [GrantorSysAdminUnitId]
                );

        OPEN @getUserAdminUnits;
        FETCH NEXT
        FROM @getUserAdminUnits INTO @SysAdminUnitId;
        WHILE @@FETCH_STATUS = 0
        BEGIN
            DELETE FROM @SysAdminUnitRoles;
            INSERT INTO @SysAdminUnitRoles
                EXEC [tsp_GetAdminUnitList] @UserId=@SysAdminUnitId;
            BEGIN TRAN;
                DELETE FROM [dbo].[SysAdminUnitInRole] WHERE SysAdminUnitId = @SysAdminUnitId;
                INSERT INTO [dbo].[SysAdminUnitInRole] (SysAdminUnitId, SysAdminUnitRoleId)
                    SELECT @SysAdminUnitId, [Id] FROM @SysAdminUnitRoles;
            COMMIT;
            FETCH NEXT
                FROM @getUserAdminUnits INTO @SysAdminUnitId;
        END;
        CLOSE @getUserAdminUnits;
        DEALLOCATE @getUserAdminUnits;
    END;

    -- No longer (who were but not remained) user managers
    INSERT INTO @NoLongerManagers
        SELECT [Id] FROM @ManagersBeforeActualization as managersBeforeActualization
            WHERE NOT EXISTS (
                SELECT NULL
                FROM @ManagersAfterActualization AS managersAfterActualization
                WHERE managersAfterActualization.[Id] = managersBeforeActualization.[Id]
            );

    -- Actualize roles for all noLonger-managers, his grantee-users and all grantee-users of user
    SET @getUserAdminUnits = CURSOR FOR
        SELECT DISTINCT [Id] FROM (
            SELECT [Id] FROM @NoLongerManagers
            UNION
            SELECT [GranteeSysAdminUnitId]
            FROM [SysAdminUnitGrantedRight]
            WHERE EXISTS (
                SELECT NULL
                FROM @NoLongerManagers AS noLongerManagers
                WHERE noLongerManagers.[Id] = [GrantorSysAdminUnitId]
            )
            UNION ALL
            SELECT GranteeSysAdminUnitId
            FROM SysAdminUnitGrantedRight
            WHERE GrantorSysAdminUnitId = @UserId
        ) Roles;

    OPEN @getUserAdminUnits;
    FETCH NEXT
        FROM @getUserAdminUnits INTO @SysAdminUnitId;
    WHILE @@FETCH_STATUS = 0
    BEGIN
        DELETE FROM @SysAdminUnitRoles;
        INSERT INTO @SysAdminUnitRoles
            EXEC [tsp_GetAdminUnitList] @UserId=@SysAdminUnitId;
        BEGIN TRAN;
            DELETE FROM [dbo].[SysAdminUnitInRole] WHERE SysAdminUnitId = @SysAdminUnitId;
            INSERT INTO [dbo].[SysAdminUnitInRole] (SysAdminUnitId, SysAdminUnitRoleId)
                SELECT @SysAdminUnitId, [Id] FROM @SysAdminUnitRoles;
        COMMIT;
        FETCH NEXT
            FROM @getUserAdminUnits INTO @SysAdminUnitId;
    END;
    CLOSE @getUserAdminUnits;
    DEALLOCATE @getUserAdminUnits;

    IF OBJECT_ID('tempdb..#AdminUnitListTemp') IS NOT NULL
    BEGIN
        DROP TABLE [#AdminUnitListTemp];
    END;
END;
GO

Example 4 (stored procedures)​

Example

Example of a recursive stored procedure that returns a table and uses PERFORM.

-- Recursive stored procedure that returns a table and uses PERFORM:
-- MSSQL
IF NOT OBJECT_ID('[dbo].[tsp_GetAdminUnitList]') IS NULL
BEGIN
    DROP PROCEDURE [dbo].[tsp_GetAdminUnitList];
END;
GO

CREATE PROCEDURE dbo.tsp_GetAdminUnitList (
    @UserId uniqueidentifier, @Granted BIT = 0
)
AS
BEGIN
    SET NOCOUNT ON;

    DECLARE @StartNestedLevel INT;

    IF object_id('tempdb..#AdminUnitList') IS NULL
    BEGIN
        CREATE TABLE [#AdminUnitList]
        (
            [Id] uniqueidentifier NOT NULL,
            [Name] NVARCHAR(250) NULL,
            [ParentRoleId] uniqueidentifier NULL,
            [Granted] BIT NULL,
            Level INT NOT NULL
        );
        SET @StartNestedLevel = @@NESTLEVEL;
    END;

    DECLARE @ConnectionType INT = (SELECT [ConnectionType] FROM SysAdminUnit WHERE [Id] = @UserId);

    -- #AdminUnitListTemp should be created in tsp_ActualizeUserRoles or in tsp_ActualizeAdminUnitInRole
    DECLARE @IsAdminUnitListTempExists BIT = OBJECT_ID('tempdb..#AdminUnitListTemp');

    IF (@IsAdminUnitListTempExists IS NULL)
    BEGIN
        WITH
        [MainSelect] AS (
            SELECT
                [Id] [Id],
                [Name] [Name],
                [ParentRoleId] [ParentRoleId]
            FROM
                [dbo].[SysAdminUnit]
            WHERE
                ([SysAdminUnitTypeValue] <= 4 OR [SysAdminUnitTypeValue] = 6)
            AND [ConnectionType] = @ConnectionType
            UNION ALL
            SELECT
                [Id] [Id],
                [Name] [Name],
                [ParentRoleId] [ParentRoleId]
            FROM
                [dbo].[SysAdminUnit]
            WHERE
                [Id] = @UserId),
        [ChiefUnitsSelect] AS (
            (
                SELECT
                    [Chief].[ParentRoleId] [Id]
                FROM
                    [dbo].[SysUserInRole] userInRole
                    INNER JOIN [dbo].[SysAdminUnit] sau ON (sau.[Id] = userInRole.[SysUserId])
                    INNER JOIN [dbo].[SysAdminUnit] [Chief] ON ([Chief].[Id] = userInRole.[SysRoleId])
                WHERE
                    sau.[Id] = @UserId AND NOT (userInRole.[SysRoleId] IS NULL) AND [Chief].[SysAdminUnitTypeValue] = 2
                UNION ALL
                SELECT
                    [Chief].[ParentRoleId] [Id]
                FROM
                    [dbo].[SysAdminUnit] [Chief]
                WHERE
                    [Chief].[Id] = @UserId AND [Chief].[SysAdminUnitTypeValue] = 2
            )
            UNION ALL
            SELECT
                sau.[Id]
            FROM
                [ChiefUnitsSelect]
                INNER JOIN [dbo].[SysAdminUnit] sau ON (sau.[ParentRoleId] = [ChiefUnitsSelect].[Id])
            WHERE
                sau.[SysAdminUnitTypeValue] < 4
        ),
        [HierarchicalSelect] AS (
            SELECT
                [Id],
                [Name],
                [ParentRoleId],
                0 [Level]
            FROM
                [MainSelect] [SelectStartLevel]
            WHERE
                [Id] IN (
                    SELECT
                        userInRole.[SysRoleId]
                    FROM
                        [dbo].[SysUserInRole] userInRole
                        INNER JOIN [dbo].[SysAdminUnit] sau ON (sau.[Id] = userInRole.[SysUserId])
                    WHERE
                        sau.[Id] = @UserId
                    UNION ALL
                    SELECT [Id] FROM [ChiefUnitsSelect]
                    UNION ALL
                    SELECT
                        [Id]
                    FROM
                        [dbo].[SysAdminUnit]
                    WHERE
                        ([ParentRoleId] IS NULL OR [Id] = @UserId)
                        AND [SysAdminUnitTypeValue] < 4
                    UNION ALL
                    SELECT
                        [FuncRoleId]
                    FROM
                        [dbo].[SysFuncRoleInOrgRole]
                    WHERE
                        [SysFuncRoleInOrgRole].[OrgRoleId] = @UserId
                    )
            UNION ALL
            SELECT
                [SelectPriorLevel].[Id],
                [SelectPriorLevel].[Name],
                [SelectPriorLevel].[ParentRoleId],
                [Level] + 1 level
            FROM
                [MainSelect] [SelectPriorLevel]
                INNER JOIN [HierarchicalSelect] hierSelect ON (hierSelect.[ParentRoleId] = [SelectPriorLevel].[Id])
        ),
        [FuncRoleHierarchicalSelect] AS (
            SELECT
                [Id],
                [Name],
                [ParentRoleId],
                0 [Level]
            FROM
                [MainSelect] [StartLevel]
            WHERE EXISTS (
                SELECT NULL
                FROM [dbo].[SysFuncRoleInOrgRole] funcRoleInOrgRole
                    INNER JOIN [HierarchicalSelect] hierSelect ON funcRoleInOrgRole.[OrgRoleId] = hierSelect.[Id]
                WHERE funcRoleInOrgRole.[FuncRoleId] = [StartLevel].[Id]
            )
            UNION ALL
            SELECT
                [PriorLevel].[Id],
                [PriorLevel].[Name],
                [PriorLevel].[ParentRoleId],
                [Level] + 1 level
            FROM
                [MainSelect] [PriorLevel]
                INNER JOIN [FuncRoleHierarchicalSelect] funcRoleHierSelect ON (funcRoleHierSelect.[ParentRoleId] = [PriorLevel].[Id])
        ),
        [DependentUserSelect] AS (
            SELECT
                mainSelect.[Id] [Id],
                mainSelect.[Name] [Name],
                mainSelect.[ParentRoleId] [ParentRoleId],
                0 [Level]
            FROM
                [MainSelect] mainSelect
            INNER JOIN [SysUserInRole] userInRole
                ON mainSelect.[Id] = userInRole.[SysUserId]
            INNER JOIN [ChiefUnitsSelect] [AllUnits]
                ON [AllUnits].[Id] = userInRole.[SysRoleId]
            WHERE
                NOT EXISTS (
                        SELECT
                            [UserUnits].[Id]
                        FROM [ChiefUnitsSelect] [UserUnits]
                        INNER JOIN [SysUserInRole] [UserInRole]
                            ON [UserUnits].[Id] = [UserInRole].[SysRoleId]
                        INNER JOIN [SysAdminUnit] sau
                            ON sau.[Id] = [UserUnits].[Id]
                        WHERE sau.[SysAdminUnitTypeValue] = 2
                            AND [UserInRole].[SysUserId] = @UserId
                            AND [UserUnits].[Id] = [AllUnits].[Id])
        )
        INSERT INTO [#AdminUnitList] ([Id], [Name], [ParentRoleId], [Granted], [Level])
        SELECT DISTINCT
            [Id],
            [Name],
            [ParentRoleId],
            @Granted,
            @@NESTLEVEL
        FROM
            (
                SELECT
                    [Id],
                    [Name],
                    [ParentRoleId]
                FROM
                    [HierarchicalSelect]
                UNION ALL
                SELECT
                    [Id],
                    [Name],
                    [ParentRoleId]
                FROM
                    [dbo].[SysAdminUnit]
                WHERE
                    [Id] = @UserId
            UNION ALL
                SELECT
                    [Id],
                    [Name],
                    [ParentRoleId]
                FROM
                    [FuncRoleHierarchicalSelect]
            UNION ALL
                SELECT
                    [Id],
                    [Name],
                    [ParentRoleId]
                FROM
            [DependentUserSelect]
        ) [AdminUnitList];
    END ELSE
    BEGIN
        DECLARE @alreadyGotRolesForThisUser bit = 0;

        IF (@IsAdminUnitListTempExists = 1)
        BEGIN
            SET @alreadyGotRolesForThisUser = (SELECT CAST( CASE WHEN EXISTS(SELECT 1 FROM [#AdminUnitListTemp]
                    WHERE [UserId] = @UserId
                    )
                    THEN 1
                    ELSE 0
                END
            AS BIT));
        END;

        IF (@alreadyGotRolesForThisUser = 1)
        BEGIN
            INSERT INTO [#AdminUnitList] ([Id], [Name], [ParentRoleId], [Granted], [Level])
                SELECT DISTINCT
                    [Id],
                    [Name],
                    [ParentRoleId],
                    @Granted,
                    @@NESTLEVEL
                FROM [#AdminUnitListTemp] WHERE UserId = @UserId;
        END ELSE
        BEGIN
            WITH
            [MainSelect] AS (
                SELECT
                    [Id] [Id],
                    [Name] [Name],
                    [ParentRoleId] [ParentRoleId]
                FROM
                    [dbo].[SysAdminUnit]
                WHERE
                    ([SysAdminUnitTypeValue] <= 4 OR [SysAdminUnitTypeValue] = 6)
                AND [ConnectionType] = @ConnectionType
                UNION ALL
                SELECT
                    [Id] [Id],
                    [Name] [Name],
                    [ParentRoleId] [ParentRoleId]
                FROM
                    [dbo].[SysAdminUnit]
                WHERE
                    [Id] = @UserId),
            [ChiefUnitsSelect] AS (
                (
                    SELECT
                        [Chief].[ParentRoleId] [Id]
                    FROM
                        [dbo].[SysUserInRole] sysUserInRole
                        INNER JOIN [dbo].[SysAdminUnit] sau ON (sau.[Id] = sysUserInRole.[SysUserId])
                        INNER JOIN [dbo].[SysAdminUnit] [Chief] ON ([Chief].[Id] = sysUserInRole.[SysRoleId])
                    WHERE
                        sau.[Id] = @UserId AND NOT (sysUserInRole.[SysRoleId] IS NULL) AND [Chief].[SysAdminUnitTypeValue] = 2
                    UNION ALL
                    SELECT
                        [Chief].[ParentRoleId] [Id]
                    FROM
                        [dbo].[SysAdminUnit] [Chief]
                    WHERE
                        [Chief].[Id] = @UserId AND [Chief].[SysAdminUnitTypeValue] = 2
                )
                UNION ALL
                SELECT
                    sau.[Id]
                FROM
                    [ChiefUnitsSelect] ChiefUnitsSelect
                    INNER JOIN [dbo].[SysAdminUnit] sau ON (sau.[ParentRoleId] = [ChiefUnitsSelect].[Id])
                WHERE
                    sau.[SysAdminUnitTypeValue] < 4
            ),
            [HierarchicalSelect] AS (
                SELECT
                    [Id],
                    [Name],
                    [ParentRoleId],
                    0 [Level]
                FROM
                    [MainSelect] [SelectStartLevel]
                WHERE EXISTS (
                    SELECT NULL
                    FROM (
                        SELECT [SysUserInRole].[SysRoleId] AS RoleId
                        FROM [dbo].[SysUserInRole]
                            INNER JOIN [dbo].[SysAdminUnit] ON ([SysAdminUnit].[Id] = [SysUserInRole].[SysUserId])
                        WHERE [SysAdminUnit].[Id] = @UserId

                        UNION ALL

                        SELECT [Id] AS RoleId
                        FROM [ChiefUnitsSelect]

                        UNION ALL

                        SELECT [Id] AS RoleId
                        FROM [dbo].[SysAdminUnit]
                        WHERE ([ParentRoleId] IS NULL OR [Id] = @UserId)
                            AND [SysAdminUnitTypeValue] < 4

                        UNION ALL

                        SELECT [FuncRoleId] AS RoleId
                        FROM [dbo].[SysFuncRoleInOrgRole]
                        WHERE [SysFuncRoleInOrgRole].[OrgRoleId] = @UserId
                    ) AS Roles
                    WHERE Roles.RoleId = [SelectStartLevel].[Id]

                )
                UNION ALL
                SELECT
                    [SelectPriorLevel].[Id],
                    [SelectPriorLevel].[Name],
                    [SelectPriorLevel].[ParentRoleId],
                    [Level] + 1 level
                FROM
                    [MainSelect] [SelectPriorLevel]
                    INNER JOIN [HierarchicalSelect] hierSelect ON (hierSelect.[ParentRoleId] = [SelectPriorLevel].[Id])
            ),
            [FuncRoleHierarchicalSelect] AS (
                SELECT
                    [Id],
                    [Name],
                    [ParentRoleId],
                    0 [Level]
                FROM
                    [MainSelect] [StartLevel]
                WHERE EXISTS (
                    SELECT NULL
                    FROM [dbo].[SysFuncRoleInOrgRole] funcRoleInOrgRole
                        INNER JOIN [HierarchicalSelect] hierSelect ON funcRoleInOrgRole.[OrgRoleId] = hierSelect.[Id]
                    WHERE funcRoleInOrgRole.[FuncRoleId] = [StartLevel].[Id]
                )
                UNION ALL
                SELECT
                    [PriorLevel].[Id],
                    [PriorLevel].[Name],
                    [PriorLevel].[ParentRoleId],
                    [Level] + 1
                FROM
                    [MainSelect] [PriorLevel]
                    INNER JOIN [FuncRoleHierarchicalSelect] funcRolesHierSelect ON (funcRolesHierSelect.[ParentRoleId] = [PriorLevel].[Id])
            ),
            [DependentUserSelect] AS (
                SELECT
                    [MainSelect].[Id] [Id],
                    [MainSelect].[Name] [Name],
                    [MainSelect].[ParentRoleId] [ParentRoleId],
                    0 [Level]
                FROM
                    [MainSelect]
                INNER JOIN [SysUserInRole] sysUserInRole
                    ON [MainSelect].[Id] = sysUserInRole.[SysUserId]
                INNER JOIN [ChiefUnitsSelect] [AllUnits]
                    ON [AllUnits].[Id] = sysUserInRole.[SysRoleId]
                WHERE
                    NOT EXISTS (
                            SELECT
                                [UserUnits].[Id]
                            FROM [ChiefUnitsSelect] [UserUnits]
                            INNER JOIN [SysUserInRole] [UserInRole]
                                ON [UserUnits].[Id] = [UserInRole].[SysRoleId]
                            INNER JOIN [SysAdminUnit] sau
                                ON sau.[Id] = [UserUnits].[Id]
                            WHERE sau.[SysAdminUnitTypeValue] = 2
                                AND [UserInRole].[SysUserId] = @UserId
                                AND [UserUnits].[Id] = [AllUnits].[Id])
            )
            INSERT INTO #AdminUnitListTemp ([UserId], [Id], [Name], [ParentRoleId], [Granted])
            SELECT DISTINCT
                @UserId,
                [Id],
                [Name],
                [ParentRoleId],
                @Granted
            FROM
                (
                    SELECT
                        [Id],
                        [Name],
                        [ParentRoleId]
                    FROM
                        [HierarchicalSelect]
                    UNION ALL
                    SELECT
                        [Id],
                        [Name],
                        [ParentRoleId]
                    FROM
                        [dbo].[SysAdminUnit]
                    WHERE
                        [Id] = @UserId
                UNION ALL
                    SELECT
                        [Id],
                        [Name],
                        [ParentRoleId]
                    FROM
                        [FuncRoleHierarchicalSelect]
                UNION ALL
                    SELECT
                        [Id],
                        [Name],
                        [ParentRoleId]
                    FROM
                [DependentUserSelect]
                ) [AdminUnitList];

            INSERT INTO [#AdminUnitList] ([Id], [Name], [ParentRoleId], [Granted], [Level])
            SELECT DISTINCT
                [Id],
                [Name],
                [ParentRoleId],
                @Granted,
                @@NESTLEVEL
            FROM [#AdminUnitListTemp] WHERE UserId = @UserId;
        END;
    END;

    DECLARE @DependentUserId uniqueidentifier;
    DECLARE @DependentUsersList CURSOR;
    SET @DependentUsersList = CURSOR FOR
        SELECT
            [#AdminUnitList].[Id]
        FROM
            [#AdminUnitList]
        INNER JOIN [SysAdminUnit] ON [#AdminUnitList].[Id] = [SysAdminUnit].[Id]
        WHERE
            [SysAdminUnit].[SysAdminUnitTypeValue] = 4 AND [#AdminUnitList].[Id] <> @UserId
            AND [#AdminUnitList].[Granted] <> 1 AND [#AdminUnitList].[Level] >= @@NESTLEVEL;
    OPEN @DependentUsersList;
    FETCH NEXT
    FROM @DependentUsersList INTO @DependentUserId;
    WHILE @@FETCH_STATUS = 0
    BEGIN
        EXEC [tsp_GetAdminUnitList] @UserId=@DependentUserId, @Granted=1;
    FETCH NEXT
    FROM @DependentUsersList INTO @DependentUserId;
    END;
    CLOSE @DependentUsersList;
    DEALLOCATE @DependentUsersList;

    DECLARE @GrantorSysAdminUnitId uniqueidentifier;
    DECLARE @getGrantorSysAdminUnitList CURSOR;
    SET @getGrantorSysAdminUnitList = CURSOR FOR
        SELECT
            [GrantorSysAdminUnitId]
        FROM
            [dbo].[SysAdminUnitGrantedRight]
        WHERE
            [GranteeSysAdminUnitId] = @UserId
            AND NOT EXISTS(SELECT * FROM [#AdminUnitList] WHERE [Id] = @UserId AND [Granted] = 1 AND [Level] < @@NESTLEVEL);
    OPEN @getGrantorSysAdminUnitList;
    FETCH NEXT
    FROM @getGrantorSysAdminUnitList INTO @GrantorSysAdminUnitId;
    WHILE @@FETCH_STATUS = 0
    BEGIN
        EXEC [tsp_GetAdminUnitList] @UserId=@GrantorSysAdminUnitId, @Granted=1;
    FETCH NEXT
    FROM @getGrantorSysAdminUnitList INTO @GrantorSysAdminUnitId;
    END;
    CLOSE @getGrantorSysAdminUnitList;
    DEALLOCATE @getGrantorSysAdminUnitList;

    IF @@NESTLEVEL = @StartNestedLevel
    BEGIN
        WITH QQ ([Id], [Name], [ParentRoleId], SysAdminUnitTypeValue) as (
            SELECT DISTINCT adminUnitList.[Id],
                adminUnitList.[Name],
                adminUnitList.[ParentRoleId],
                sau.SysAdminUnitTypeValue
            FROM [#AdminUnitList] adminUnitList
            INNER JOIN SysAdminUnit sau on sau.Id = adminUnitList.[Id]
        )
        SELECT [Id], [Name], [ParentRoleId] FROM QQ
        ORDER BY SysAdminUnitTypeValue DESC;
    END;
END;
GO

Example 5 (stored procedures)​

Example

Example of a stored procedure that uses exception handling and executes a custom script.

-- Stored procedure that uses exception handling and executes a custom script
-- MSSQL
IF  EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[tsp_CanConvertData]') AND type IN (N'P', N'PC'))
DROP PROCEDURE [dbo].[tsp_CanConvertData]
GO
CREATE PROCEDURE [dbo].[tsp_CanConvertData]
    @EntitySchemaName SYSNAME,
    @SourceColumnName SYSNAME,
    @NewColumnDataType SYSNAME,
    @Result BIT OUT
AS
BEGIN
    SET NOCOUNT ON

    SET @Result = 0

    DECLARE @sql NVARCHAR(MAX)
    DECLARE @unicodeCharLength INT = 2
    DECLARE @dataTypeName SYSNAME
    DECLARE @dataTypeSize INT
    DECLARE @dataTypePrecision INT

    SELECT
        @dataTypeName = UPPER(DATA_TYPE),
        @dataTypeSize =
        CASE
            WHEN CHARACTER_MAXIMUM_LENGTH IS NULL THEN NUMERIC_PRECISION
            ELSE CHARACTER_MAXIMUM_LENGTH
        END,
        @dataTypePrecision = ISNULL(NUMERIC_SCALE, 0)
    FROM INFORMATION_SCHEMA.COLUMNS
    WHERE TABLE_NAME = @EntitySchemaName
    AND COLUMN_NAME = @SourceColumnName

    IF (@dataTypeName IS NULL)
    BEGIN
        RETURN
    END

    DECLARE @newDataTypeName SYSNAME
    DECLARE @newDataTypeSize INT
    DECLARE @newDataTypePrecision INT
    DEClARE @i INT
    DECLARE @newDataTypeSizeDefinition NVARCHAR(MAX)

    SET @i = CHARINDEX('(', @NewColumnDataType)
    IF (@i = 0)
    BEGIN
        SET @newDataTypeName = @NewColumnDataType
        SET @newDataTypeSize = 0
        SET @newDataTypePrecision = 0
    END ELSE
    BEGIN
        SET @newDataTypeName = UPPER(LTRIM(RTRIM(SUBSTRING(@NewColumnDataType, 1, @i - 1))))
        SET @newDataTypeSizeDefinition = LTRIM(RTRIM(SUBSTRING(@NewColumnDataType, @i + 1,
            LEN(@NewColumnDataType))))
        SET @i = CHARINDEX(')', @newDataTypeSizeDefinition)
        IF (@i > 0)
        BEGIN
            SET @newDataTypeSizeDefinition = LTRIM(RTRIM(SUBSTRING(@newDataTypeSizeDefinition, 1, @i - 1)))
        END
        SET @i = CHARINDEX(',', @newDataTypeSizeDefinition)
        IF (@i > 0)
        BEGIN
            SET @newDataTypeSize = CAST(LTRIM(RTRIM(SUBSTRING(@newDataTypeSizeDefinition, 1, @i - 1))) AS INT)
            SET @newDataTypePrecision = CAST(LTRIM(RTRIM(SUBSTRING(@newDataTypeSizeDefinition, @i + 1,
                LEN(@newDataTypeSizeDefinition)))) AS INT)
        END ELSE
        BEGIN
            SET @newDataTypePrecision = 0
            IF (UPPER(@newDataTypeSizeDefinition) = 'MAX')
            BEGIN
                SET @newDataTypeSize = -1
            END ELSE
            BEGIN
                SET @newDataTypeSize = CAST(@newDataTypeSizeDefinition AS INT)
            END
        END
    END

    DECLARE @ImplicitDataConvertTable TABLE (
        SourceDataType SYSNAME,
        DestinationDataType SYSNAME
    )
    INSERT INTO @ImplicitDataConvertTable
    SELECT 'INT', 'INT'
    UNION ALL
    SELECT 'INT', 'BIT'
    UNION ALL
    SELECT 'INT', 'DECIMAL'
    UNION ALL
    SELECT 'INT', 'VARCHAR'
    UNION ALL
    SELECT 'INT', 'NVARCHAR'
    UNION ALL
    SELECT 'INT', 'VARBINARY'
    UNION ALL
    SELECT 'BIT', 'BIT'
    UNION ALL
    SELECT 'BIT', 'INT'
    UNION ALL
    SELECT 'BIT', 'DECIMAL'
    UNION ALL
    SELECT 'BIT', 'VARCHAR'
    UNION ALL
    SELECT 'BIT', 'NVARCHAR'
    UNION ALL
    SELECT 'BIT', 'VARBINARY'
    UNION ALL
    SELECT 'DECIMAL', 'BIT'
    UNION ALL
    SELECT 'UNIQUEIDENTIFIER', 'UNIQUEIDENTIFIER'
    UNION ALL
    SELECT 'UNIQUEIDENTIFIER', 'VARBINARY'
    UNION ALL
    SELECT 'VARCHAR', 'INT'
    UNION ALL
    SELECT 'VARCHAR', 'BIT'
    UNION ALL
    SELECT 'VARCHAR', 'UNIQUEIDENTIFIER'
    UNION ALL
    SELECT 'DATETIME2', 'DATETIME2'
    UNION ALL
    SELECT 'DATETIME2', 'DATE'
    UNION ALL
    SELECT 'DATETIME2', 'TIME'
    UNION ALL
    SELECT 'DATETIME2', 'VARCHAR'
    UNION ALL
    SELECT 'DATE', 'DATE'
    UNION ALL
    SELECT 'DATE', 'DATETIME2'
    UNION ALL
    SELECT 'DATE', 'VARCHAR'
    UNION ALL
    SELECT 'DATE', 'NVARCHAR'
    UNION ALL
    SELECT 'TIME', 'TIME'
    UNION ALL
    SELECT 'TIME', 'DATETIME2'
    UNION ALL
    SELECT 'TIME', 'VARCHAR'
    UNION ALL
    SELECT 'TIME', 'NVARCHAR'
    UNION ALL
    SELECT 'VARBINARY', 'INT'
    UNION ALL
    SELECT 'VARBINARY', 'BIT'
    UNION ALL
    SELECT 'VARBINARY', 'UNIQUEIDENTIFIER'

    IF EXISTS(SELECT * FROM @ImplicitDataConvertTable
        WHERE SourceDataType = @dataTypeName AND DestinationDataType = @newDataTypeName)
    BEGIN
        SET @Result = 1
        RETURN
    END

    DECLARE @ImplicitDataOverflowConvertTable TABLE (
        SourceDataType SYSNAME,
        DestinationDataType SYSNAME
    )
    INSERT INTO @ImplicitDataOverflowConvertTable
    SELECT 'DECIMAL', 'INT'
    UNION ALL
    SELECT 'DECIMAL', 'DECIMAL'
    UNION ALL
    SELECT 'DECIMAL', 'VARCHAR'
    UNION ALL
    SELECT 'DECIMAL', 'NVARCHAR'
    UNION ALL
    SELECT 'DECIMAL', 'VARBINARY'
    UNION ALL
    SELECT 'UNIQUEIDENTIFIER', 'VARCHAR'
    UNION ALL
    SELECT 'UNIQUEIDENTIFIER', 'NVARCHAR'
    UNION ALL
    SELECT 'VARCHAR', 'INT'
    UNION ALL
    SELECT 'VARCHAR', 'BIT'
    UNION ALL
    SELECT 'VARCHAR', 'DECIMAL'
    UNION ALL
    SELECT 'VARCHAR', 'VARCHAR'
    UNION ALL
    SELECT 'VARCHAR', 'NVARCHAR'
    UNION ALL
    SELECT 'NVARCHAR', 'INT'
    UNION ALL
    SELECT 'NVARCHAR', 'BIT'
    UNION ALL
    SELECT 'NVARCHAR', 'DECIMAL'
    UNION ALL
    SELECT 'NVARCHAR', 'VARCHAR'
    UNION ALL
    SELECT 'NVARCHAR', 'NVARCHAR'
    UNION ALL
    SELECT 'VARBINARY', 'VARCHAR'
    UNION ALL
    SELECT 'VARBINARY', 'NVARCHAR'
    UNION ALL
    SELECT 'VARBINARY', 'VARBINARY'

    IF EXISTS(SELECT * FROM @ImplicitDataOverflowConvertTable
        WHERE SourceDataType = @dataTypeName AND DestinationDataType = @newDataTypeName)
    BEGIN
        SET @sql = N'IF EXISTS(SELECT * FROM [' + @EntitySchemaName + ']) SET @Result = 0 ELSE SET @Result = 1'
        EXEC sp_executesql @sql, N'@Result BIT OUT', @Result = @Result OUT

        IF (@Result = 1)
        BEGIN
            RETURN
        END
        BEGIN TRY
            IF (@dataTypeName = 'DECIMAL' AND @newDataTypeName = 'INT') OR
                (@dataTypeName = 'DECIMAL' AND @newDataTypeName = 'VARCHAR') OR
                (@dataTypeName = 'DECIMAL' AND @newDataTypeName = 'NVARCHAR') OR
                (@dataTypeName = 'DECIMAL' AND @newDataTypeName = 'VARBINARY') OR
                (@dataTypeName = 'DECIMAL' AND @newDataTypeName = 'DECIMAL')
            BEGIN
                DECLARE @cnt INT
                DECLARE @ConvertDescription NVARCHAR(MAX)
                SET @ConvertDescription = 'CONVERT(' + @NewColumnDataType +', [' + @SourceColumnName+ '])'
                SET @sql = N'IF EXISTS(SELECT * FROM [' + @EntitySchemaName +\*'] WHERE ' +
                @ConvertDescription + ' = ' + @ConvertDescription + ') SET @cnt = 1 ELSE SET @cnt = 0'
                EXEC sp_executesql @sql, N'@cnt INT OUT', @cnt = @cnt OUT
                SET @Result = 1
            END ELSE
            BEGIN
                DECLARE @dl INT
                SET @sql = N'SELECT @dl = MAX(DATALENGTH([' + @SourceColumnName + '])) ' +
                'FROM [' + @EntitySchemaName + ']'
                EXEC sp_executesql @sql, N'@dl INT OUT', @dl = @dl OUT
                IF (@newDataTypeName IN ('VARCHAR', 'NVARCHAR', 'VARBINARY') AND @newDataTypeSize = -1)
                BEGIN
                    SET @Result = 1
                END ELSE
                IF (@dl <= @newDataTypeSize OR (
                    @newDataTypeName IN ('NVARCHAR', 'NCHAR') AND (@dl / @unicodeCharLength) <= @newDataTypeSize))
                BEGIN
                    SET @Result = 1
                END ELSE
                BEGIN
                    SET @Result = 0
                END
            END
        END TRY
        BEGIN CATCH
            SET @Result = 0
        END CATCH
    END ELSE
    BEGIN
        SET @Result = 0
    END
END
GO

Example 6 (functions)​

Example

Example of a function.

-- Function
-- MSSQL
IF  EXISTS (SELECT * FROM sys.objects
        WHERE object_id = OBJECT_ID(N'[dbo].[fn_IsGuid]') AND type = N'FN')
DROP FUNCTION [dbo].[fn_IsGuid]
GO

CREATE FUNCTION [dbo].[fn_IsGuid] (
    @ValidateValue NVARCHAR(MAX))
RETURNS BIT
AS
BEGIN
    DECLARE @hasLeftBraces BIT
    IF @ValidateValue LIKE '{%'
    BEGIN
        SET @ValidateValue = SUBSTRING(@ValidateValue, 2, LEN(@ValidateValue) - 1)
        SET @hasLeftBraces = 1
    END ELSE
    BEGIN
        SET @hasLeftBraces = 0
    END
    DECLARE @hasRightBraces BIT
    IF @ValidateValue LIKE '%}'
    BEGIN
        SET @ValidateValue = SUBSTRING(@ValidateValue, 1, LEN(@ValidateValue) - 1)
        SET @hasRightBraces = 1
    END ELSE
    BEGIN
        SET @hasRightBraces = 0
    END
    DECLARE @Result BIT
    IF @ValidateValue LIKE '[0-9a-fA-F][0-9a-fA-F][0-9a-fA-F][0-9a-fA-F][0-9a-fA-F][0-9a-fA-F][0-9a-fA-F][0-9a-fA-F]-[0-9a-fA-F][0-9a-fA-F][0-9a-fA-F][0-9a-fA-F]-[0-9a-fA-F][0-9a-fA-F][0-9a-fA-F][0-9a-fA-F]-[0-9a-fA-F][0-9a-fA-F][0-9a-fA-F][0-9a-fA-F]-[0-9a-fA-F][0-9a-fA-F][0-9a-fA-F][0-9a-fA-F][0-9a-fA-F][0-9a-fA-F][0-9a-fA-F][0-9a-fA-F][0-9a-fA-F][0-9a-fA-F][0-9a-fA-F][0-9a-fA-F]'
    BEGIN
        SET @Result = 1
    END ELSE
    BEGIN
        SET @Result = 0
    END
    IF @hasLeftBraces = @hasRightBraces
    BEGIN
        RETURN @Result
    END ELSE
    BEGIN
        SET @Result = 0
    END
    RETURN @Result
END
GO

Resources​

Official PostgreSQL documentation