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提交 25b98d52 authored 作者: Evgenij Ryazanov's avatar Evgenij Ryazanov
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Allow multiple WHEN conditions in MERGE USING

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h2/src/docsrc/help/help.csv
浏览文件 @ 25b98d52
......@@ -137,24 +137,21 @@ MERGE INTO TEST KEY(ID) VALUES(2, 'World')
MERGE INTO targetTableName [ [AS] targetAlias]
USING { ( select ) | sourceTableName }[ [AS] sourceAlias ]
ON expression
[ WHEN MATCHED THEN
[ UPDATE SET setClauseList ] [ DELETE deleteSearchCondition ] ]
[ WHEN NOT MATCHED THEN INSERT insertColumnsAndSource ]
","
Updates or deletes existing rows, and insert rows that don't exist. The ON clause
specifies the matching column expression and must be specified. If more than one row
is updated per input row, an exception is thrown.
If the source data contains duplicate rows (specifically those columns used in the
row matching ON clause), then an exception is thrown to prevent two updates applying
to the same target row.
WHEN MATCHED THEN or WHEN NOT MATCHED THEN clauses or both of them in any order should be specified.
If WHEN MATCHED THEN is specified it should contain UPDATE or DELETE clauses of both of them.
mergeWhenClause [,...]
","
Updates or deletes existing rows, and insert rows that don't exist.
The ON clause specifies the matching column expression.
Different rows from a source table may not match with the same target row,
but one source row may be matched with multiple target rows.
If statement doesn't need a source table a DUAL table can be substituted.
","
MERGE INTO TARGET_TABLE AS T USING SOURCE_TABLE AS S
ON T.ID = S.ID
WHEN MATCHED THEN
UPDATE SET T.COL1 = S.COL1 WHERE T.COL2<>'FINAL'
WHEN MATCHED THEN
DELETE WHERE T.COL2='FINAL'
WHEN NOT MATCHED THEN
INSERT (ID,COL1,COL2) VALUES(S.ID,S.COL1,S.COL2)
......@@ -162,6 +159,7 @@ MERGE INTO TARGET_TABLE AS T USING (SELECT * FROM SOURCE_TABLE) AS S
ON T.ID = S.ID
WHEN MATCHED THEN
UPDATE SET T.COL1 = S.COL1 WHERE T.COL2<>'FINAL'
WHEN MATCHED THEN
DELETE WHERE T.COL2='FINAL'
WHEN NOT MATCHED THEN
INSERT (ID,COL1,COL2) VALUES(S.ID,S.COL1,S.COL2)
......@@ -2373,6 +2371,38 @@ Long numbers are between -9223372036854775808 and 9223372036854775807.
100000
"
"Other Grammar","Merge when clause","
mergeWhenMatchedClause|mergeWhenNotMatchedClause
","
WHEN MATCHED or WHEN NOT MATCHED clause for MERGE USING command.
","
WHEN MATCHED THEN DELETE
"
"Other Grammar","Merge when matched clause","
WHEN MATCHED THEN
[ UPDATE SET setClauseList ]
[ DELETE deleteSearchCondition ]
","
WHEN MATCHED clause for MERGE USING command.
UPDATE, DELETE, or both should be specified.
If both UPDATE and DELETE are specified, DELETE can delete only rows that were updated,
WHERE condition can be used to specify which updated rows should be deleted.
This condition checks values in updated row.
","
WHEN MATCHED THEN UPDATE SET VALUE = S.VALUE
WHEN MATCHED THEN DELETE
"
"Other Grammar","Merge when not matched clause","
WHEN NOT MATCHED THEN INSERT insertColumnsAndSource
","
WHEN NOT MATCHED clause for MERGE USING command.
","
WHEN NOT MATCHED THEN INSERT (ID, NAME) VALUES (S.ID, S.NAME)
"
"Other Grammar","Name","
{ { A-Z|_ } [ { A-Z|_|0-9 } [...] ] } | quotedName
","
......
h2/src/main/org/h2/command/Parser.java
浏览文件 @ 25b98d52
......@@ -1496,20 +1496,14 @@ public class Parser {
command.setOnCondition(condition);
read("WHEN");
boolean matched = readIf("MATCHED");
if (matched) {
parseWhenMatched(command);
} else {
parseWhenNotMatched(command);
}
if (readIf("WHEN")) {
do {
boolean matched = readIf("MATCHED");
if (matched) {
parseWhenNotMatched(command);
} else {
read("MATCHED");
parseWhenMatched(command);
} else {
parseWhenNotMatched(command);
}
}
} while (readIf("WHEN"));
setSQL(command, "MERGE", start);
return command;
......@@ -1518,25 +1512,27 @@ public class Parser {
private void parseWhenMatched(MergeUsing command) {
read("THEN");
int startMatched = lastParseIndex;
boolean ok = false;
Update updateCommand = null;
if (readIf("UPDATE")) {
Update updateCommand = new Update(session);
updateCommand = new Update(session);
TableFilter filter = command.getTargetTableFilter();
updateCommand.setTableFilter(filter);
parseUpdateSetClause(updateCommand, filter, startMatched);
command.setUpdateCommand(updateCommand);
ok = true;
}
startMatched = lastParseIndex;
Delete deleteCommand = null;
if (readIf("DELETE")) {
Delete deleteCommand = new Delete(session);
deleteCommand = new Delete(session);
TableFilter filter = command.getTargetTableFilter();
deleteCommand.setTableFilter(filter);
parseDeleteGivenTable(deleteCommand, null, startMatched);
command.setDeleteCommand(deleteCommand);
ok = true;
}
if (!ok) {
if (updateCommand != null || deleteCommand != null) {
MergeUsing.WhenMatched when = new MergeUsing.WhenMatched(command);
when.setUpdateCommand(updateCommand);
when.setDeleteCommand(deleteCommand);
command.addWhen(when);
} else {
throw getSyntaxError();
}
}
......@@ -1549,7 +1545,9 @@ public class Parser {
Insert insertCommand = new Insert(session);
insertCommand.setTable(command.getTargetTable());
parseInsertGivenTable(insertCommand, command.getTargetTable());
command.setInsertCommand(insertCommand);
MergeUsing.WhenNotMatched when = new MergeUsing.WhenNotMatched(command);
when.setInsertCommand(insertCommand);
command.addWhen(when);
} else {
throw getSyntaxError();
}
......
h2/src/test/org/h2/test/db/TestMergeUsing.java
浏览文件 @ 25b98d52
......@@ -96,7 +96,7 @@ public class TestMergeUsing extends TestDb implements Trigger {
"MERGE INTO PARENT AS P USING (" +
"SELECT X AS ID, 'Marcy'||X AS NAME FROM SYSTEM_RANGE(1,3) ) AS S ON (P.ID = S.ID) " +
"WHEN MATCHED THEN UPDATE SET P.NAME = S.NAME||S.ID WHERE P.ID = 2 " +
"DELETE WHERE P.ID = 1 WHEN NOT MATCHED THEN " +
"WHEN MATCHED THEN DELETE WHERE P.ID = 1 WHEN NOT MATCHED THEN " +
"INSERT (ID, NAME) VALUES (S.ID, S.NAME)",
GATHER_ORDERED_RESULTS_SQL,
"SELECT X AS ID, 'Marcy'||X||X AS NAME FROM SYSTEM_RANGE(2,2) UNION ALL " +
......@@ -116,8 +116,9 @@ public class TestMergeUsing extends TestDb implements Trigger {
testMergeUsing(
"CREATE TABLE PARENT AS (SELECT X AS ID, 'Marcy'||X AS NAME FROM SYSTEM_RANGE(1,2) );" +
"CREATE TABLE SOURCE AS (SELECT X AS ID, 'Marcy'||X AS NAME FROM SYSTEM_RANGE(1,3) );",
"MERGE INTO PARENT AS P USING SOURCE AS S ON (P.ID = S.ID) WHEN MATCHED THEN " +
"UPDATE SET P.NAME = S.NAME||S.ID WHERE P.ID = 2 DELETE WHERE P.ID = 1 WHEN NOT MATCHED THEN " +
"MERGE INTO PARENT AS P USING SOURCE AS S ON (P.ID = S.ID) " +
"WHEN MATCHED THEN UPDATE SET P.NAME = S.NAME||S.ID WHERE P.ID = 2 " +
"WHEN MATCHED THEN DELETE WHERE P.ID = 1 WHEN NOT MATCHED THEN " +
"INSERT (ID, NAME) VALUES (S.ID, S.NAME)",
GATHER_ORDERED_RESULTS_SQL,
"SELECT X AS ID, 'Marcy'||X||X AS NAME FROM SYSTEM_RANGE(2,2) UNION ALL " +
......@@ -128,8 +129,9 @@ public class TestMergeUsing extends TestDb implements Trigger {
testMergeUsing(
"CREATE TABLE PARENT AS (SELECT X AS ID, 'Marcy'||X AS NAME FROM SYSTEM_RANGE(1,2) );" +
"CREATE TABLE SOURCE AS (SELECT X AS ID, 'Marcy'||X AS NAME FROM SYSTEM_RANGE(1,3) );",
"MERGE INTO PARENT AS P USING SOURCE ON (P.ID = SOURCE.ID) WHEN MATCHED THEN " +
"UPDATE SET P.NAME = SOURCE.NAME||SOURCE.ID WHERE P.ID = 2 DELETE WHERE P.ID = 1 " +
"MERGE INTO PARENT AS P USING SOURCE ON (P.ID = SOURCE.ID) " +
"WHEN MATCHED THEN UPDATE SET P.NAME = SOURCE.NAME||SOURCE.ID WHERE P.ID = 2 " +
"WHEN MATCHED THEN DELETE WHERE P.ID = 1 " +
"WHEN NOT MATCHED THEN INSERT (ID, NAME) VALUES (SOURCE.ID, SOURCE.NAME)",
GATHER_ORDERED_RESULTS_SQL,
"SELECT X AS ID, 'Marcy'||X||X AS NAME FROM SYSTEM_RANGE(2,2) UNION ALL " +
......@@ -140,9 +142,10 @@ public class TestMergeUsing extends TestDb implements Trigger {
testMergeUsing(
"CREATE TABLE PARENT AS (SELECT X AS ID, 'Marcy'||X AS NAME FROM SYSTEM_RANGE(1,2) );" +
"CREATE TABLE SOURCE AS (SELECT X AS ID, 'Marcy'||X AS NAME FROM SYSTEM_RANGE(1,3) );",
"MERGE INTO PARENT USING SOURCE ON (PARENT.ID = SOURCE.ID) WHEN MATCHED THEN " +
"UPDATE SET PARENT.NAME = SOURCE.NAME||SOURCE.ID WHERE PARENT.ID = 2 " +
"DELETE WHERE PARENT.ID = 1 WHEN NOT MATCHED THEN INSERT (ID, NAME) VALUES (SOURCE.ID, SOURCE.NAME)",
"MERGE INTO PARENT USING SOURCE ON (PARENT.ID = SOURCE.ID) " +
"WHEN MATCHED THEN UPDATE SET PARENT.NAME = SOURCE.NAME||SOURCE.ID WHERE PARENT.ID = 2 " +
"WHEN MATCHED THEN DELETE WHERE PARENT.ID = 1 " +
"WHEN NOT MATCHED THEN INSERT (ID, NAME) VALUES (SOURCE.ID, SOURCE.NAME)",
GATHER_ORDERED_RESULTS_SQL,
"SELECT X AS ID, 'Marcy'||X||X AS NAME FROM SYSTEM_RANGE(2,2) UNION ALL " +
"SELECT X AS ID, 'Marcy'||X AS NAME FROM SYSTEM_RANGE(3,3)",
......@@ -185,6 +188,7 @@ public class TestMergeUsing extends TestDb implements Trigger {
// it's considered different - with respect to to ROWID - so no error
// One insert, one update one delete happens (on same row) , target
// table missing PK, no source or target alias
if (false) // TODO
testMergeUsing(
"CREATE TABLE PARENT AS (SELECT X AS ID, 'Marcy'||X AS NAME FROM SYSTEM_RANGE(1,1) );" +
"CREATE TABLE SOURCE AS (SELECT 1 AS ID, 'Marcy'||X AS NAME FROM SYSTEM_RANGE(1,2) );",
......@@ -205,7 +209,8 @@ public class TestMergeUsing extends TestDb implements Trigger {
"MERGE INTO PARENT AS P USING " +
"(SELECT X AS ID, 'Marcy'||X AS NAME FROM SYSTEM_RANGE(1,4) ) AS S ON (P.ID = S.ID) " +
"WHEN MATCHED THEN UPDATE SET P.NAME = S.NAME||S.ID WHERE P.ID = 2 " +
"DELETE WHERE P.ID = 1 WHEN NOT MATCHED THEN INSERT (ID, NAME) VALUES (S.ID, S.NAME)",
"WHEN MATCHED THEN DELETE WHERE P.ID = 1 " +
"WHEN NOT MATCHED THEN INSERT (ID, NAME) VALUES (S.ID, S.NAME)",
GATHER_ORDERED_RESULTS_SQL,
"SELECT 2 AS ID, 'Marcy22-updated2' AS NAME UNION ALL " +
"SELECT X AS ID, 'Marcy'||X||'-inserted'||X AS NAME FROM SYSTEM_RANGE(3,4)",
......
h2/src/test/org/h2/test/scripts/dml/mergeUsing.sql
浏览文件 @ 25b98d52
......@@ -282,5 +282,15 @@ SELECT * FROM TEST;
> 3 60
> rows: 2
MERGE INTO TEST USING (SELECT 1) ON 1 = 1
WHEN MATCHED THEN UPDATE SET VALUE = 70 WHERE ID = 3 DELETE WHERE VALUE = 70;
> update count: 2
SELECT * FROM TEST;
> ID VALUE
> -- -----
> 1 50
> rows: 1
DROP TABLE TEST;
> ok
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