org.apache.ignite.internal.processors.query.h2.dml

Class DmlAstUtils

java.lang.Object

org.apache.ignite.internal.processors.query.h2.dml.DmlAstUtils

public final class DmlAstUtils
extends Object

AST utils for DML

Method Summary

Modifier and Type	Method and Description
static void	collectAllGridTablesInTarget(GridSqlElement from, Set<GridSqlTable> tbls)
static FastUpdate	getFastDeleteArgs(GridSqlDelete del)
static FastUpdate	getFastUpdateArgs(GridSqlUpdate update)
static GridSqlTable	gridTableForElement(GridSqlElement target)
static GridSqlSelect	selectForDelete(GridSqlDelete del) Generate SQL SELECT based on DELETE's WHERE, LIMIT, etc.
static GridSqlQuery	selectForInsertOrMerge(GridSqlColumn[] cols, List<GridSqlElement[]> rows, GridSqlQuery subQry) Create SELECT on which subsequent INSERT or MERGE will be based.
static GridSqlSelect	selectForUpdate(GridSqlUpdate update) Generate SQL SELECT based on UPDATE's WHERE, LIMIT, etc.

Methods inherited from class java.lang.Object

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

Method Detail

selectForInsertOrMerge

public static GridSqlQuery selectForInsertOrMerge(GridSqlColumn[] cols,
                                                  List<GridSqlElement[]> rows,
                                                  GridSqlQuery subQry)

Create SELECT on which subsequent INSERT or MERGE will be based.

Parameters:

cols - Columns to insert values into.

rows - Rows to create pseudo-SELECT upon.

subQry - Subquery to use rather than rows.

Returns:

Subquery or pseudo-SELECT to evaluate inserted expressions, or null no query needs to be run.

selectForDelete

public static GridSqlSelect selectForDelete(GridSqlDelete del)

Generate SQL SELECT based on DELETE's WHERE, LIMIT, etc.

Parameters:

del - Delete statement.

Returns:

SELECT statement.

getFastUpdateArgs

public static FastUpdate getFastUpdateArgs(GridSqlUpdate update)

Parameters:

update - UPDATE statement.

Returns:

null if given statement directly updates _val column with a literal or param value and filters by single non expression key (and, optionally, by single non expression value).

getFastDeleteArgs

public static FastUpdate getFastDeleteArgs(GridSqlDelete del)

Parameters:

del - DELETE statement.

Returns:

true if given statement filters by single non expression key.

selectForUpdate

public static GridSqlSelect selectForUpdate(GridSqlUpdate update)

Generate SQL SELECT based on UPDATE's WHERE, LIMIT, etc.

Parameters:

update - Update statement.

Returns:

SELECT statement.

collectAllGridTablesInTarget

public static void collectAllGridTablesInTarget(GridSqlElement from,
                                                Set<GridSqlTable> tbls)

Parameters:

from - From element.

tbls - Tables.

gridTableForElement

public static GridSqlTable gridTableForElement(GridSqlElement target)

Parameters:

target - Expression to extract the table from.

Returns:

Back end table for this element.