QueryFunction class

Level: advanced

The Terrasoft.Core.DB.QueryFunction class implements the expression function.

The following classes implement the expression function:

• QueryFunction. The base class of the expression function.
• AggregationQueryFunction. Implements the aggregate expression function.
• IsNullQueryFunction. Replaces null values with the replacing expression.
• CreateGuidQueryFunction. Implements the expression function for a new ID.
• CurrentDateTimeQueryFunction. Implements the expression function for the current date and time.
• CoalesceQueryFunction. Returns the first non-null expression from the argument list.
• DatePartQueryFunction. Implements the expression function for a part of a Date/Time type value.
• DateAddQueryFunction. Implements the expression function for the date, calculated by adding the period to the date.
• DateDiffQueryFunction. Implements the expression function for the difference between the dates, calculated by subtracting the dates.
• CastQueryFunction. Casts the argument expression to the specified data type.
• UpperQueryFunction. Converts the argument expression characters to uppercase.
• CustomQueryFunction. Implements a custom function.
• DataLengthQueryFunction. Calculates bytes used to represent the expression.
• TrimQueryFunction. Removes whitespaces from both ends of the expression.
• LengthQueryFunction. Returns the expression length.
• SubstringQueryFunction. Retrieves a part of the string.
• ConcatQueryFunction. Creates a string by merging the string arguments of the function.
• WindowQueryFunction. Implements an SQL window function.

QueryFunction class

The Terrasoft.Core.DB namespace.

The base class of the expression function.

note

View the entire list of methods of the QueryFunction class, its parent classes, as well as the interfaces it implements, in the .NET classes reference documentation.

Methods

static QueryColumnExpression Negate(QueryFunction operand)

Returns the expression that negates the value of the passed function.

Parameters

operand

The expression function.

static QueryColumnExpression operator -(QueryFunction operand)

Overloads the operator that negates the passed expression function.

Parameters

operand

The expression function.

static QueryColumnExpression Add(QueryFunction leftOperand, QueryFunction rightOperand)

Returns the expression that adds the passed expression functions.

Parameters

leftOperand	The left operand in the addition operation.
rightOperand	The right operand in the addition operation.

static QueryColumnExpression operator +(QueryFunction leftOperand, QueryFunction rightOperand)

Overloads the operator that adds two expression functions.

Parameters

leftOperand	The left operand in the addition operation.
rightOperand	The right operand in the addition operation.

static QueryColumnExpression Subtract(QueryFunction leftOperand, QueryFunction rightOperand)

Returns the expression that subtracts the right expression function from the left function.

Parameters

leftOperand	The left operand in the subtraction operation.
rightOperand	The right operand in the subtraction operation.

static QueryColumnExpression operator -(QueryFunction leftOperand, QueryFunction rightOperand)

Overloads the operator that subtracts the right expression function from the left function.

Parameters

leftOperand	The left operand in the subtraction operation.
rightOperand	The right operand in the subtraction operation.

static QueryColumnExpression Multiply(QueryFunction leftOperand, QueryFunction rightOperand)

Returns the expression that multiplies the passed expression functions.

Parameters

leftOperand	The left operand in the multiplication operation.
rightOperand	The right operand in the multiplication operation.

static QueryColumnExpression operator *(QueryFunction leftOperand, QueryFunction rightOperand)

Overloads the operator that multiplies two expression functions.

Parameters

leftOperand	The left operand in the multiplication operation.
rightOperand	The right operand in the multiplication operation.

static QueryColumnExpression Divide(QueryFunction leftOperand, QueryFunction rightOperand)

Returns the expression that divides the left expression function by the right function.

Parameters

leftOperand	The left operand in the division operation.
rightOperand	The right operand in the division operation.

static QueryColumnExpression operator /(QueryFunction leftOperand, QueryFunction rightOperand)

Overloads the operator that divides the expression functions.

Parameters

leftOperand	The left operand in the division operation.
rightOperand	The right operand in the division operation.

abstract object Clone()

Makes a copy of the current QueryFunction instance.

abstract void BuildSqlText(StringBuilder sb, DBEngine dbEngine)

Generates the query string using the passed StringBuilder instance and the DBEngine query builder.

Parameters

sb	The StringBuilder instance required to create the query string.
dbEngine	The instance of the database query builder.

virtual void AddUsingParameters(QueryParameterCollection resultParameters)

Adds the passed collection of parameters to the function arguments.

Parameters

resultParameters

A collection of query parameters to add to the function arguments.

QueryColumnExpressionCollection GetQueryColumnExpressions()

Returns the collection of query column expressions for the current query function.

QueryColumnExpression GetQueryColumnExpression()

Returns the query column expression for the current query function.

AggregationQueryFunction class

Terrasoft.Core.DB namespace.

The class implements the aggregate expression function.

note

View the entire list of methods and properties of the AggregationQueryFunction class, its parent classes, as well as the interfaces it implements, in the .NET classes reference documentation.

Constructors

AggregationQueryFunction();

Initializes a new AggregationQueryFunction instance.

AggregationQueryFunction(AggregationTypeStrict aggregationType, QueryColumnExpression expression)

Initializes a new AggregationQueryFunction instance with the specified type of the aggregate function for the specified column expression.

Parameters

aggregationType	The aggregate function type.
expression	The column expression to apply the aggregate function.

AggregationQueryFunction(AggregationTypeStrict aggregationType, IQueryColumnExpressionConvertible expression)

Initializes a new AggregationQueryFunction instance with the specified type of the aggregate function for the column expression.

Parameters

aggregationType	The aggregate function type.
expression	The column expression to apply the aggregate function.

AggregationQueryFunction(AggregationQueryFunction source)

Initializes a new AggregationQueryFunction instance that is a clone of the passed aggregate expression function.

Parameters

source

The aggregate function of the AggregationQueryFunction expression to clone.

Properties

AggregationType AggregationTypeStrict

The aggregate function type.

AggregationEvalType AggregationEvalType

The aggregate function scope.

Expression QueryColumnExpression

The function argument expression.

Methods

override void BuildSqlText(StringBuilder sb, DBEngine dbEngine)

Generates the query string using the specified StringBuilder instance and the DBEngine query builder.

Parameters

sb	The StringBuilder instance required to create the query string.
dbEngine	The instance of the database query builder.

override void AddUsingParameters(QueryParameterCollection resultParameters)

Adds the passed collection of parameters to the function arguments.

Parameters

resultParameters

A collection of query parameters to add to the function arguments.

override object Clone()

Creates a clone of the current AggregationQueryFunction instance.

AggregationQueryFunction All()

Sets the To All Values scope for the current aggregate function.

AggregationQueryFunction Distinct()

Sets the To Unique Values scope for the current aggregate function.

IsNullQueryFunction class

Terrasoft.Core.DB namespace.

The class replaces null values with the replacing expression.

note

View the entire list of methods and properties of the IsNullQueryFunction class, its parent classes, as well as the interfaces it implements, in the .NET classes reference documentation.

Constructors

IsNullQueryFunction();

Initializes a new IsNullQueryFunction instance.

IsNullQueryFunction(QueryColumnExpression checkExpression, QueryColumnExpression replacementExpression)
IsNullQueryFunction(IQueryColumnExpressionConvertible checkExpression, IQueryColumnExpressionConvertible replacementExpression)

Initializes a new IsNullQueryFunction instance for the check expression and the replacing expression.

Parameters

checkExpression	The expression to compare to null.
replacementExpression	The expression the function returns if checkExpression is null.

IsNullQueryFunction(IsNullQueryFunction source)

Initializes a new IsNullQueryFunction instance that is a clone of the passed expression function.

Parameters

source

The aggregate function of the IsNullQueryFunction expression to clone.

Properties

CheckExpression QueryColumnExpression

The function argument expression to compare to null.

ReplacementExpression QueryColumnExpression

The function argument expression to return if the check expression is null.

Methods

override void BuildSqlText(StringBuilder sb, DBEngine dbEngine)

Generates the query string using the specified StringBuilder instance and the DBEngine query builder.

Parameters

sb	The StringBuilder instance required to create the query string.
dbEngine	The instance of the database query builder.

override void AddUsingParameters(QueryParameterCollection resultParameters)

Adds the passed collection of parameters to the function arguments.

Parameters

resultParameters

A collection of query parameters to add to the function arguments.

override object Clone()

Creates a clone of the current IsNullQueryFunction instance

CreateGuidQueryFunction class

Terrasoft.Core.DB namespace.

The class implements the expression function for a new ID.

note

View the entire list of methods of the CreateGuidQueryFunction class, its parent classes, as well as the interfaces it implements, in the .NET classes reference documentation.

Constructors

CreateGuidQueryFunction();

Initializes a new CreateGuidQueryFunction instance.

CreateGuidQueryFunction(CreateGuidQueryFunction source)

Initializes a new CreateGuidQueryFunction instance that is a clone of the passed function.

Parameters

source

The CreateGuidQueryFunction function to clone.

Methods

override void BuildSqlText(StringBuilder sb, DBEngine dbEngine)

Generates the query string using the specified StringBuilder instance and the DBEngine query builder.

Parameters

sb	The StringBuilder instance required to create the query string.
dbEngine	The instance of the database query builder.

override object Clone()

Clones the current CreateGuidQueryFunction instance.

CurrentDateTimeQueryFunction class

The Terrasoft.Core.DB namespace.

The class implements the expression function for the current date and time.

note

View the entire list of methods of the CurrentDateTimeQueryFunction class, its parent classes, as well as the interfaces it implements, in the .NET classes reference documentation.

Constructors

CurrentDateTimeQueryFunction();

Initializes a new CurrentDateTimeQueryFunction instance.

CurrentDateTimeQueryFunction(CurrentDateTimeQueryFunction source)

Initializes a new CurrentDateTimeQueryFunction instance that is a clone of the passed function.

Parameters

source

The CurrentDateTimeQueryFunction function to clone.

Methods

override void BuildSqlText(StringBuilder sb, DBEngine dbEngine)

Generates the query string using the specified StringBuilder instance and the DBEngine query builder.

Parameters

sb	The StringBuilder instance required to create the query string.
dbEngine	The instance of the database query builder.

override object Clone()

Creates a clone of the current CurrentDateTimeQueryFunction instance.

CoalesceQueryFunction class

Terrasoft.Core.DB namespace.

The class returns the first non-null expression from the argument list.

note

View the entire list of methods and properties of the CoalesceQueryFunction class, its parent classes, as well as the interfaces it implements, in the .NET classes reference documentation.

Constructors

CoalesceQueryFunction();

Initializes a new CoalesceQueryFunction instance.

CoalesceQueryFunction(CoalesceQueryFunction source)

Initializes a new CoalesceQueryFunction instance that is a clone of the passed function.

Parameters

source

The CoalesceQueryFunction function to clone.

CoalesceQueryFunction(QueryColumnExpressionCollection expressions)

Initializes a new CoalesceQueryFunction instance for the passed collection of column expressions.

Parameters

expressions

The collection of query column expressions.

CoalesceQueryFunction(QueryColumnExpression[] expressions)
CoalesceQueryFunction(IQueryColumnExpressionConvertible[] expressions)

Initializes a new CoalesceQueryFunction instance for the passed array of column expressions.

Parameters

expressions

The array of query column expressions.

Properties

Expressions QueryColumnExpressionCollection

The collection of function argument expressions.

Methods

override void BuildSqlText(StringBuilder sb, DBEngine dbEngine)

Generates the query string using the specified StringBuilder instance and the DBEngine query builder.

Parameters

sb	The StringBuilder instance required to create the query string.
dbEngine	The instance of the database query builder.

override object Clone()

Creates a clone of the current CoalesceQueryFunction instance.

override void AddUsingParameters(QueryParameterCollection resultParameters)

Adds the specified parameters to the collection.

Parameters

resultParameters

A collection of query parameters to add to the function arguments.

DatePartQueryFunction class

Terrasoft.Core.DB namespace.

The class implements the expression function for a part of a Date/Time type value.

note

View the entire list of methods and properties of the DatePartQueryFunction class, its parent classes, as well as the interfaces it implements, in the .NET classes reference documentation.

Constructors

DatePartQueryFunction();

Initializes a new instance of the DatePartQueryFunction class.

DatePartQueryFunction(DatePartQueryFunctionInterval interval, QueryColumnExpression expression)
DatePartQueryFunction(DatePartQueryFunctionInterval interval, IQueryColumnExpressionConvertible expression)

Initializes a new DatePartQueryFunction instance with the set expression of the Date/Time type column and the specified date part.

Parameters

interval	The date part.
expression	The expression of the Date/Time type column.

DatePartQueryFunction(DatePartQueryFunction source)

Initializes a new DatePartQueryFunction instance that is a clone of the passed function.

Parameters

source

The DatePartQueryFunction function to clone.

Properties

Expression QueryColumnExpression

The expression of the function argument.

Interval DatePartQueryFunctionInterval

The date part that the function returns.

UseUtcOffset bool

Whether to use the Universal Coordinated Time (UTC) offset relative to the set local time.

UtcOffset int?

The UTC offset.

Methods

override void BuildSqlText(StringBuilder sb, DBEngine dbEngine)

Generates the query string using the specified StringBuilder instance and the DBEngine query builder.

Parameters

sb	The StringBuilder instance required to create the query string.
dbEngine	The instance of the database query builder.

override void AddUsingParameters(QueryParameterCollection resultParameters)

Adds the specified parameters to the collection.

Parameters

resultParameters

A collection of query parameters to add to the function arguments.

override object Clone()

Creates a clone of the current DatePartQueryFunction instance.

DateAddQueryFunction class

Terrasoft.Core.DB namespace.

The class implements the expression function for the date, calculated by adding the period to the date.

note

View the entire list of methods and properties of the DateAddQueryFunction class, its parent classes, as well as the interfaces it implements, in the .NET classes reference documentation.

Constructors

DateAddQueryFunction();

Initializes a new instance of the DateAddQueryFunction class.

DateAddQueryFunction(DatePartQueryFunctionInterval interval, int number, QueryColumnExpression expression)
DateAddQueryFunction(DatePartQueryFunctionInterval interval, IQueryColumnExpressionConvertible numberExpression, IQueryColumnExpressionConvertible expression)
DateAddQueryFunction(DatePartQueryFunctionInterval interval, int number, IQueryColumnExpressionConvertible expression)

Initializes a DateAddQueryFunction instance with the specified parameters.

Parameters

interval	The date part to add the period.
number	The value to add to interval.
expression	The expression of the column that contains the original date.

DateAddQueryFunction(DateAddQueryFunction source)

Initializes a DateAddQueryFunction instance that is a clone of the passed function.

Parameters

source

The instance of the DateAddQueryFunction function to clone.

Properties

Expression QueryColumnExpression

The expression of the column that contains the original date.

Interval DatePartQueryFunctionInterval

The date part to add the period.

Number int

The period to add.

NumberExpression QueryColumnExpression

The expression that contains the period to add.

Methods

override void BuildSqlText(StringBuilder sb, DBEngine dbEngine)

Generates the query string using the specified StringBuilder instance and the DBEngine query builder.

Parameters

sb	The StringBuilder instance required to create the query string.
dbEngine	The instance of the database query builder.

override void AddUsingParameters(QueryParameterCollection resultParameters)

Adds the specified parameters to the collection.

Parameters

resultParameters

A collection of query parameters to add to the function arguments.

override object Clone()

Creates a clone of the current DateAddQueryFunction instance.

DateDiffQueryFunction class

Terrasoft.Core.DB namespace.

The class implements the expression function for the difference between the dates, calculated by subtraction.

note

View the entire list of methods and properties of the DateDiffQueryFunction class, its parent classes, as well as the interfaces it implements, in the .NET classes reference documentation.

Constructors

DateDiffQueryFunction(DateDiffQueryFunctionInterval interval, QueryColumnExpression startDateExpression, QueryColumnExpression endDateExpression)
DateDiffQueryFunction(DateDiffQueryFunctionInterval interval, IQueryColumnExpressionConvertible startDateExpression, IQueryColumnExpressionConvertible endDateExpression)

Initializes a DateDiffQueryFunction instance with the specified parameters.

Parameters

interval	The date interval unit.
startDateExpression	The expression of the column that contains the start date.
endDateExpression	The expression of the column that contains the end date.

DateDiffQueryFunction(DateDiffQueryFunction source)

Initializes a DateDiffQueryFunction instance that is a clone of the passed function.

Parameters

source

The instance of the DateDiffQueryFunction to clone.

Properties

StartDateExpression QueryColumnExpression

The expression of the column that contains the start date.

EndDateExpression QueryColumnExpression

The expression of the column that contains the end date.

Interval DateDiffQueryFunctionInterval

The date difference’s measurement unit that the function returns.

Methods

override void BuildSqlText(StringBuilder sb, DBEngine dbEngine)

Generates the query string using the specified StringBuilder instance and the DBEngine query builder.

Parameters

sb	The StringBuilder instance required to create the query string.
dbEngine	The instance of the database query builder.

override void AddUsingParameters(QueryParameterCollection resultParameters)

Adds the specified parameters to the collection.

Parameters

resultParameters

A collection of query parameters to add to the function arguments.

override object Clone()

Creates a clone of the current DateDiffQueryFunction instance.

CastQueryFunction class

Terrasoft.Core.DB namespace.

The class casts the argument expression to the specified data type.

note

View the entire list of methods and properties of the CastQueryFunction class, its parent classes, as well as the interfaces it implements, in the .NET classes reference documentation.

Constructors

CastQueryFunction(QueryColumnExpression expression, DBDataValueType castType)
CastQueryFunction(IQueryColumnExpressionConvertible expression, DBDataValueType castType)

Initializes a new CastQueryFunction instance with the specified column expression and target data type.

Parameters

expression	The query column expression.
castType	The target data type.

CastQueryFunction(CastQueryFunction source)

Initializes a new CastQueryFunction instance that is a clone of the passed function.

Parameters

source

The CastQueryFunction function to clone.

Properties

Expression QueryColumnExpression

The expression of the function argument.

CastType DBDataValueType

The target data type.

Methods

override void BuildSqlText(StringBuilder sb, DBEngine dbEngine)

Generates the query string using the specified StringBuilder instance and the DBEngine query builder.

Parameters

sb	The StringBuilder instance required to create the query string.
dbEngine	The instance of the database query builder.

override void AddUsingParameters(QueryParameterCollection resultParameters)

Adds the specified parameters to the collection.

Parameters

resultParameters

A collection of query parameters to add to the function arguments.

override object Clone()

Creates a clone of the current CastQueryFunction instance.

UpperQueryFunction class

Terrasoft.Core.DB namespace.

The class converts the argument expression characters to uppercase.

note

View the entire list of methods and properties of the UpperQueryFunction class, its parent classes, as well as the interfaces it implements, in the .NET classes reference documentation.

Constructors

UpperQueryFunction();

Initializes a new instance of the UpperQueryFunction class.

UpperQueryFunction(QueryColumnExpression expression)
UpperQueryFunction(IQueryColumnExpressionConvertible expression)

Initializes a new UpperQueryFunction instance for the specified column expression.

Parameters

expression

The query column expression.

UpperQueryFunction(UpperQueryFunction source)

Initializes a new UpperQueryFunction instance that is a clone of the passed function.

Parameters

source

The UpperQueryFunction function to clone.

Properties

Expression;

The expression of the function argument.

Methods

override void BuildSqlText(StringBuilder sb, DBEngine dbEngine)

Generates the query string using the specified StringBuilder instance and the DBEngine query builder.

Parameters

sb	The StringBuilder instance required to create the query string.
dbEngine	The instance of the database query builder.

override void AddUsingParameters(QueryParameterCollection resultParameters)

Adds the specified parameters to the collection.

Parameters

resultParameters

A collection of query parameters to add to the function arguments.

override object Clone()

Creates a clone of the current UpperQueryFunction instance.

CustomQueryFunction class

Terrasoft.Core.DB namespace.

The class implements a custom function.

note

View the entire list of methods and properties of the CustomQueryFunction class, its parent classes, as well as the interfaces it implements, in the .NET classes reference documentation.

Constructors

CustomQueryFunction();

Initializes a new instance of the CustomQueryFunction class.

CustomQueryFunction(string functionName, QueryColumnExpressionCollection expressions)

Initializes a new CustomQueryFunction instance for the specified function and passed collection of column expressions.

Parameters

functionName	The name of the function.
expressions	The collection of query column expressions.

CustomQueryFunction(string functionName, QueryColumnExpression[] expressions)
CustomQueryFunction(string functionName, IQueryColumnExpressionConvertible[] expressions)

Initializes a new CustomQueryFunction instance for the specified function and passed array of column expressions.

Parameters

functionName	The name of the function.
expressions	The array of query column expressions.

CustomQueryFunction(CustomQueryFunction source)

Initializes a new CustomQueryFunction instance that is a clone of the passed function.

Parameters

source

The CustomQueryFunction function to clone.

Properties

Expressions QueryColumnExpressionCollection

The collection of function argument expressions.

FunctionName string

The name of the function.

Methods

override void BuildSqlText(StringBuilder sb, DBEngine dbEngine)

Generates the query string using the specified StringBuilder instance and the DBEngine query builder.

Parameters

sb	The StringBuilder instance required to create the query string.
dbEngine	The instance of the database query builder.

override void AddUsingParameters(QueryParameterCollection resultParameters)

Adds the specified parameters to the collection.

Parameters

resultParameters

A collection of query parameters to add to the function arguments.

override object Clone()

Creates a clone of the current CustomQueryFunction instance.

DataLengthQueryFunction class

Terrasoft.Core.DB namespace.

The class calculates bytes used to represent the expression.

note

View the entire list of methods and properties of the DataLengthQueryFunction class, its parent classes, as well as the interfaces it implements, in the .NET classes reference documentation.

Constructors

DataLengthQueryFunction();

Initializes a new instance of the DataLengthQueryFunction class.

DataLengthQueryFunction(QueryColumnExpression expression)

Initializes a new DataLengthQueryFunction instance for the specified column expression.

Parameters

expression

The query column expression.

DataLengthQueryFunction(IQueryColumnExpressionConvertible columnNameExpression)

Initializes a new DataLengthQueryFunction instance for the specified column expression.

Parameters

columnNameExpression

The query column expression.

DataLengthQueryFunction(DataLengthQueryFunction source)

Initializes a new DataLengthQueryFunction instance that is a clone of the passed function.

Parameters

source

The DataLengthQueryFunction function to clone.

Properties

Expression QueryColumnExpression

The function argument expression.

Methods

override void BuildSqlText(StringBuilder sb, DBEngine dbEngine)

Generates the query string using the specified StringBuilder instance and the DBEngine query builder.

Parameters

sb	The StringBuilder instance required to create the query string.
dbEngine	The instance of the database query builder.

override void AddUsingParameters(QueryParameterCollection resultParameters)

Adds the passed collection of parameters to the function arguments.

Parameters

resultParameters

A collection of query parameters to add to the function arguments.

override object Clone()

Creates a clone of the current DataLengthQueryFunction instance.

TrimQueryFunction class

Terrasoft.Core.DB namespace.

The class removes whitespaces from both ends of the expression.

note

View the entire list of methods and properties of the TrimQueryFunction class, its parent classes, as well as the interfaces it implements, in the .NET classes reference documentation.

Constructors

TrimQueryFunction(QueryColumnExpression expression)
TrimQueryFunction(IQueryColumnExpressionConvertible expression)

Initializes a new TrimQueryFunction instance for the specified column expression.

Parameters

expression

The query column expression.

TrimQueryFunction(TrimQueryFunction source)

Initializes a new TrimQueryFunction instance that is a clone of the passed function.

Parameters

source

The TrimQueryFunction function to clone.

Properties

Expression QueryColumnExpression

The expression of the function argument.

Methods

override void BuildSqlText(StringBuilder sb, DBEngine dbEngine)

Generates the query string using the specified StringBuilder instance and the DBEngine query builder.

Parameters

sb	The StringBuilder instance required to create the query string.
dbEngine	The instance of the database query builder.

override void AddUsingParameters(QueryParameterCollection resultParameters)

Adds the passed collection of parameters to the function arguments.

Parameters

resultParameters

A collection of query parameters to add to the function arguments.

override object Clone()

Creates a clone of the current TrimQueryFunction instance.

LengthQueryFunction class

Terrasoft.Core.DB namespace.

The class returns the length of the expression.

note

View the entire list of methods and properties of the LengthQueryFunction class, its parent classes, as well as the interfaces it implements, in the .NET classes reference documentation.

Constructors

LengthQueryFunction();

Initializes a new instance of the LengthQueryFunction class.

LengthQueryFunction(QueryColumnExpression expression)
LengthQueryFunction(IQueryColumnExpressionConvertible expression)

Initializes a new LengthQueryFunction instance for the specified column expression.

Parameters

expression

The query column expression.

LengthQueryFunction(LengthQueryFunction source)

Initializes a new LengthQueryFunction instance that is a clone of the passed function.

Parameters

source

The LengthQueryFunction function to clone.

Properties

Expression QueryColumnExpression

The function argument expression.

Methods

override void BuildSqlText(StringBuilder sb, DBEngine dbEngine)

Generates the query string using the specified StringBuilder instance and the DBEngine query builder.

Parameters

sb	The StringBuilder instance required to create the query string.
dbEngine	The instance of the database query builder.

override void AddUsingParameters(QueryParameterCollection resultParameters)

Adds the passed collection of parameters to the function arguments.

Parameters

resultParameters

A collection of query parameters to add to the function arguments.

override object Clone()

Creates a clone of the current LengthQueryFunction instance.

SubstringQueryFunction class

Terrasoft.Core.DB namespace.

The class retrieves a part of the string.

note

View the entire list of methods and properties of the SubstringQueryFunction class, its parent classes, as well as the interfaces it implements, in the .NET classes reference documentation.

Constructors

SubstringQueryFunction(QueryColumnExpression expression, int start, int length)
SubstringQueryFunction(IQueryColumnExpressionConvertible expression, int start, int length)

Initializes a new SubstringQueryFunction instance for the specified column expression, starting position and the substring length.

Parameters

expression	The query column expression.
start	The starting position of the substring.
length	The length of the substring.

SubstringQueryFunction(SubstringQueryFunction source)

Initializes a new SubstringQueryFunction instance that is a clone of the passed function.

Parameters

source

The SubstringQueryFunction function to clone.

Properties

Expression QueryColumnExpression

The expression of the function argument.

StartExpression QueryColumnExpression

The starting position of the substring.

LengthExpression QueryColumnExpression

The length of the substring.

Methods

override void BuildSqlText(StringBuilder sb, DBEngine dbEngine)

Generates the query string using the specified StringBuilder instance and the DBEngine query builder.

Parameters

sb	The StringBuilder instance required to create the query string.
dbEngine	The instance of the database query builder.

override void AddUsingParameters(QueryParameterCollection resultParameters)

Adds the passed collection of parameters to the function arguments.

Parameters

resultParameters

A collection of query parameters to add to the function arguments.

override object Clone()

Creates a clone of the current SubstringQueryFunction instance.

ConcatQueryFunction class

Terrasoft.Core.DB namespace.

The class creates a string by merging the string arguments of the function.

note

View the entire list of methods and properties of the ConcatQueryFunction class, its parent classes, as well as the interfaces it implements, in the .NET classes reference documentation.

Constructors

ConcatQueryFunction(QueryColumnExpressionCollection expressions)

Initializes a new ConcatQueryFunction instance for the passed expression collection.

Parameters

expressions

The collection of query column expressions.

ConcatQueryFunction(ConcatQueryFunction source)

Initializes a new ConcatQueryFunction instance that is a clone of the passed function.

Parameters

source

The ConcatQueryFunction function to clone.

Properties

Expressions QueryColumnExpressionCollection

The collection of function argument expressions.

Methods

override void BuildSqlText(StringBuilder sb, DBEngine dbEngine)

Generates the query string using the specified StringBuilder instance and the DBEngine query builder.

Parameters

sb	The StringBuilder instance required to create the query string.
dbEngine	The instance of the database query builder.

override void AddUsingParameters(QueryParameterCollection resultParameters)

Adds the passed collection of parameters to the function arguments.

Parameters

resultParameters

A collection of query parameters to add to the function arguments.

override object Clone()

Creates a clone of the current ConcatQueryFunction instance.

WindowQueryFunction class

The Terrasoft.Core.DB namespace.

The class implements an SQL window function.

note

View the entire list of methods and properties of the WindowQueryFunction class, its parent classes, as well as the interfaces it implements, in the .NET classes reference documentation.

Constructors

WindowQueryFunction(QueryFunction innerFunction)

Implements an SQL window function.

Parameters

innerFunction

The nested function.

WindowQueryFunction(QueryFunction innerFunction, QueryColumnExpression partitionByExpression = null, QueryColumnExpression orderByExpression = null) : this(innerFunction)

Implements an SQL window function.

Parameters

innerFunction	The nested function.
partitionByExpression	The expression that separates the query.
orderByExpression	The expression that sorts the query.

WindowQueryFunction(WindowQueryFunction source) : this( source.InnerFunction, source.PartitionByExpression, source.OrderByExpression)

Initializes a new WindowQueryFunction instance that is a clone of the passed function.

Parameters

source

The WindowQueryFunction function to clone.

Properties

InnerFunction QueryFunction

The function to apply.

PartitionByExpression QueryColumnExpression

Partition by items.

OrderByExpression QueryColumnExpression

Sorts by items.

Methods

override void BuildSqlText(StringBuilder sb, DBEngine dbEngine)

Generates the query string using the specified StringBuilder instance and the DBEngine query builder.

Parameters

sb	The StringBuilder instance required to create the query string.
dbEngine	The instance of the database query builder.

override void AddUsingParameters(QueryParameterCollection resultParameters)

Adds the passed collection of parameters to the function arguments.

Parameters

resultParameters

A collection of query parameters to add to the function arguments.

override object Clone()

Creates a clone of the current WindowQueryFunction instance.