com.espertech.esper.client.hook

Interface SQLColumnTypeConversion

public interface SQLColumnTypeConversion

Implement this interface when providing a callback for SQL input parameter and column result processing for a statement, converting an input parameter or converting an output column value into any other value.

An instance of the class implementating this interface exists typically per statement that the callback has been registered for by means of EPL statement annotation.

Method Summary

Modifier and Type	Method and Description
Class	getColumnType(SQLColumnTypeContext context) Return the new type of the column.
Object	getColumnValue(SQLColumnValueContext context) Return the new value of the column.
Object	getParameterValue(SQLInputParameterContext context) Return the new value of the input parameter.

Method Detail

getColumnType

Class getColumnType(SQLColumnTypeContext context)

Return the new type of the column. To leave the type unchanged, return SQLColumnTypeContext.getColumnClassType() or null.

Parameters:

context - contains the database name, query fired, column name, column type and column number

Returns:

type of column after conversion

getColumnValue

Object getColumnValue(SQLColumnValueContext context)

Return the new value of the column. To leave the value unchanged, return SQLColumnValueContext.getColumnValue().

Parameters:

context - contains the column name, column value and column number

Returns:

value of column after conversion

getParameterValue

Object getParameterValue(SQLInputParameterContext context)

Return the new value of the input parameter. To leave the value unchanged, return SQLInputParameterContext.getParameterValue().

Parameters:

context - contains the parameter name and number

Returns:

value of parameter after conversion