Package org.apache.empire.db.expr.column
package org.apache.empire.db.expr.column
This package contains SQL-generator classes for column expressions.
There is no need to use these classes directly. They are internally created through functions on the DBColumnExpr object.
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ClassDescriptionThis implements some basic functionality for SQL functions based on a column expressionThis class allows column renaming in SQL.This class is used for performing calculations in SQL
It handles the mathematical operations ("+", "-", "*", "/") for the current column.This class represents a SQL case expression like "case when ?This class is used to create a SQL CASE constraint in the form of case {expr} when {value1} then {result1} when {value2} then {result2} ...This class is used to create a SQL CASE constraint in the form of case when {cond1} then {result1} when {cond2} then {result2} ...This class is used for performing string concatenation in SQLDBConcatExpressionThis class is used to convert a value to a different data type.This class is used to add the "count" statement to the SQL-Command.This class is used to decode a set of keys to the corresponding target values.This class is used for performing various SQL functions on a column or column expression.This class allows column renaming in SQL.DBPreparable This interface indicates that a DBExpr Object wants to perform preparation tasks when added to a DBCommandThis class is used for declaring scalar functions in SQL (like e.g. random).This class is used for declaring constant values in SQL.