Class EntitySchemaCastQueryFunction
Function of casting the argument expression to the specified data type.
Inherited Members
Namespace: Terrasoft.Core.Entities
Assembly: Terrasoft.Core.dll
Syntax
public class EntitySchemaCastQueryFunction : EntitySchemaQueryFunction, IMetaItem, IMetaDataSerializable, ICloneable
Constructors
EntitySchemaCastQueryFunction(EntitySchemaCastQueryFunction)
Initializes the EntitySchemaCastQueryFunction instance that is a clone of the passed-in function instance.
Declaration
public EntitySchemaCastQueryFunction(EntitySchemaCastQueryFunction source)
Parameters
Type | Name | Description |
---|---|---|
EntitySchemaCastQueryFunction | source | The instance of the EntitySchemaCastQueryFunction function whose clone is being created. |
EntitySchemaCastQueryFunction(EntitySchemaQuery, DBDataValueType)
Initializes the EntitySchemaCastQueryFunction instance for the specified query to the schema of the object with the specified target data type.
Declaration
public EntitySchemaCastQueryFunction(EntitySchemaQuery parentQuery, DBDataValueType castType)
Parameters
Type | Name | Description |
---|---|---|
EntitySchemaQuery | parentQuery | Query against the schema of the entity that contains the function. |
DBDataValueType | castType | The target data type. |
EntitySchemaCastQueryFunction(EntitySchemaQuery, EntitySchemaQueryExpression, DBDataValueType)
Initializes the EntitySchemaCastQueryFunction instance with the specified expression and target data type.
Declaration
public EntitySchemaCastQueryFunction(EntitySchemaQuery parentQuery, EntitySchemaQueryExpression expression, DBDataValueType castType)
Parameters
Type | Name | Description |
---|---|---|
EntitySchemaQuery | parentQuery | Query against the schema of the entity that contains the function. |
EntitySchemaQueryExpression | expression | The query expression. |
DBDataValueType | castType | The target data type. |
Properties
CastType
The target data type.
Declaration
public DBDataValueType CastType { get; set; }
Property Value
Type | Description |
---|---|
DBDataValueType |
Expression
The expression of the function argument.
Declaration
public EntitySchemaQueryExpression Expression { get; set; }
Property Value
Type | Description |
---|---|
EntitySchemaQueryExpression |
QueryAlias
The alias of the function in the SQL query.
Declaration
public override string QueryAlias { get; }
Property Value
Type | Description |
---|---|
System.String |
Overrides
Methods
ApplyMetaDataValue(DataReader)
Declaration
protected override void ApplyMetaDataValue(DataReader reader)
Parameters
Type | Name | Description |
---|---|---|
DataReader | reader |
Overrides
Clone()
Creates the clone of the current EntitySchemaCastQueryFunction instance.
Declaration
public override object Clone()
Returns
Type | Description |
---|---|
System.Object | The System.Object instance that is a clone of the current function instance. |
Overrides
CreateQueryColumnExpression(DBSecurityEngine)
Gets the expression of the request column for the current function, formed with the given access rights.
Declaration
public override QueryColumnExpression CreateQueryColumnExpression(DBSecurityEngine dbSecurityEngine)
Parameters
Type | Name | Description |
---|---|---|
DBSecurityEngine | dbSecurityEngine | The DBSecurityEngine instance that determines the access rights. |
Returns
Type | Description |
---|---|
QueryColumnExpression | The QueryColumnExpression instance for the current function, which is generated taking into account the |
Overrides
Exceptions
Type | Condition |
---|---|
InvalidObjectStateException | If the expression of the function argument is |
GetArguments()
Gets the collection of expressions of function arguments.
Declaration
public override EntitySchemaQueryExpressionCollection GetArguments()
Returns
Type | Description |
---|---|
EntitySchemaQueryExpressionCollection | Collection of expressions of function arguments. |
Overrides
GetCaption()
Gets the caption of the expression function.
Declaration
public override string GetCaption()
Returns
Type | Description |
---|---|
System.String | String of the function caption. |
Overrides
GetIsSupportedDataValueType(DataValueType)
Indicates whether the output of the function has the specified data type.
Declaration
public override bool GetIsSupportedDataValueType(DataValueType dataValueType)
Parameters
Type | Name | Description |
---|---|---|
DataValueType | dataValueType | Data type. |
Returns
Type | Description |
---|---|
System.Boolean |
|
Overrides
GetResultDataValueType(DataValueTypeManager)
Gets the data type of the output returned by the function, using the specified data type manager.
Declaration
public override DataValueType GetResultDataValueType(DataValueTypeManager dataValueTypeManager)
Parameters
Type | Name | Description |
---|---|---|
DataValueTypeManager | dataValueTypeManager | Data type manager. |
Returns
Type | Description |
---|---|
DataValueType | Data type of the output returned by the function. |
Overrides
WriteMetaData(DataWriter)
Serializes the function, using the passed-in DataWriter instance.
Declaration
public override void WriteMetaData(DataWriter writer)
Parameters
Type | Name | Description |
---|---|---|
DataWriter | writer | The DataWriter instance used for serialization. |