Class Expressions

java.lang.Object

org.springframework.data.relational.core.sql.Expressions

public abstract class Expressions
extends Object

Factory for common Expressions.

Since:

1.1

Author:

Mark Paluch, Jens Schauder

See Also:

• SQL
• Conditions
• Functions

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	Expressions.SimpleExpression

Method Summary

Modifier and Type	Method	Description
static Expression	asterisk()
static Expression	asterisk(Table table)
static Expression	cast(Expression expression, String targetType)
static Expression	just(String sql)	Creates a plain sql Expression.
static InfixOperation	minus(Expression left, Expression right)	Creates an arithmetic operation that subtracts right from left using the - operator.
static Expression	of(List<Column> columns)	Creates an Expression based on the provided list of Columns.
static InfixOperation	plus(Expression left, Expression right)	Creates an arithmetic operation that adds right to left using the + operator.

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Details

asterisk

public static Expression asterisk()

Returns:

a new asterisk * expression.

just

public static Expression just(String sql)

Creates a plain sql Expression.

Parameters:

sql - the SQL, must not be null or empty.

Returns:

a SQL Expression.

asterisk

public static Expression asterisk(Table table)

Returns:

a new Table.scoped asterisk <table>.* expression.

cast

public static Expression cast(Expression expression,
 String targetType)

Returns:

a new Cast expression.

Since:

2.3

of

public static Expression of(List<Column> columns)

Creates an Expression based on the provided list of Columns.

If the list contains only a single column, this method returns that column directly as the resulting Expression. Otherwise, it creates and returns a TupleExpression that represents multiple columns as a single expression.

Parameters:

columns - the list of Columns to include in the expression.

Returns:

an Expression corresponding to the input columns: either a single column or a TupleExpression for multiple columns.

Since:

4.0

plus

public static InfixOperation plus(Expression left,
 Expression right)

Creates an arithmetic operation that adds right to left using the + operator.

Parameters:

left - the left-hand operand.

right - the right-hand operand.

Returns:

the addition InfixOperation.

Since:

4.1.1

minus

public static InfixOperation minus(Expression left,
 Expression right)

Creates an arithmetic operation that subtracts right from left using the - operator.

Parameters:

left - the left-hand operand.

right - the right-hand operand.

Returns:

the subtraction InfixOperation.

Since:

4.1.1