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Improve support for DB2[z] empty table precondition #5043

Merged
merged 7 commits into from
Jan 15, 2024
Merged

Improve support for DB2[z] empty table precondition #5043

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7a5d6a8
Support the empty table precondition for DB2
michaelmatthiaskern Oct 10, 2023
14a7adf
Merge branch 'feature/TableiIEmptyPreconditionForDB2' of https://gith…
MalloD12 Oct 13, 2023
8674619
Merge branch 'master' into feature/TableiIEmptyPreconditionForDB2
filipelautert Oct 23, 2023
83e04f0
Merge branch 'master' into feature/TableiIEmptyPreconditionForDB2
filipelautert Dec 13, 2023
58434b9
Merge branch 'master' into feature/TableiIEmptyPreconditionForDB2
MichaelKern-IVV Dec 23, 2023
8593316
Merge branch 'master' into feature/TableiIEmptyPreconditionForDB2
filipelautert Jan 15, 2024
f216c97
Remove unreachable statement
Jan 15, 2024
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15 changes: 8 additions & 7 deletions liquibase-standard/src/main/java/liquibase/sqlgenerator/core/TableIsEmptyGenerator.java
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Original file line number Diff line number Diff line change
Expand Up @@ -29,14 +29,17 @@ public ValidationErrors validate(TableIsEmptyStatement tableIsEmptyStatement, Da

protected String generateCountSql(TableIsEmptyStatement statement, Database database) {
String tableName = database.escapeTableName(statement.getCatalogName(), statement.getSchemaName(), statement.getTableName());
if (database instanceof HsqlDatabase) {
if (database instanceof HsqlDatabase || database instanceof DB2Database) {
return String.format("SELECT COUNT(1) FROM (VALUES(0)) WHERE EXISTS (SELECT * FROM %s)", tableName);
} else if (database instanceof OracleDatabase || database instanceof MySQLDatabase) {
}
if (database instanceof Db2zDatabase) {
return String.format("SELECT COUNT(1) FROM SYSIBM.SYSDUMMY1 WHERE EXISTS (SELECT * FROM %s)", tableName);
}
if (database instanceof OracleDatabase || database instanceof MySQLDatabase) {
return String.format("SELECT COUNT(1) FROM DUAL WHERE EXISTS (SELECT * FROM %s)", tableName);
} else if (database instanceof FirebirdDatabase) {
}
if (database instanceof FirebirdDatabase) {
return String.format("SELECT COUNT(1) FROM RDB$DATABASE WHERE EXISTS (SELECT * FROM %s)", tableName);
} else if (database instanceof DB2Database) {
return String.format("SELECT COUNT(1) FROM sysibm.sysdummy1 WHERE EXISTS (SELECT * FROM %s)", tableName);
}
return String.format("SELECT COUNT(1) WHERE EXISTS (SELECT * FROM %s)", tableName);
}
Expand All @@ -46,6 +49,4 @@ protected String generateCountSql(TableIsEmptyStatement statement, Database data
public Sql[] generateSql(TableIsEmptyStatement statement, Database database, SqlGeneratorChain sqlGeneratorChain) {
return new Sql[] { new UnparsedSql(generateCountSql(statement, database)) };
}


}