HHH-4486 : MySQL [DROP TEMPORARY TABLE] support

git-svn-id: https://svn.jboss.org/repos/hibernate/core/branches/Branch_3_2@17783 1b8cb986-b30d-0410-93ca-fae66ebed9b2

src/org/hibernate/dialect/Dialect.java

@@ -1090,6 +1090,15 @@ public String getCreateTemporaryTablePostfix() {
 		return "";
 	}
 
+	/**
+	 * Command used to drop a temporary table.
+	 *
+	 * @return The command used to drop a temporary table.
+	 */
+	public String getDropTemporaryTableString() {
+		return "drop table";
+	}
+
 	/**
 	 * Does the dialect require that temporary table DDL statements occur in
 	 * isolation from other statements?  This would be the case if the creation

src/org/hibernate/dialect/MySQLDialect.java

@@ -255,6 +255,16 @@ public String getCreateTemporaryTableString() {
 		return "create temporary table if not exists";
 	}
 
+	public String getDropTemporaryTableString() {
+		return "drop temporary table";
+	}
+
+	public Boolean performTemporaryTableDDLInIsolation() {
+		// because we [drop *temporary* table...] we do not
+		// have to perform these in isolation.
+		return Boolean.FALSE;
+	}
+
 	public String getCastTypeName(int code) {
 		if ( code==Types.INTEGER ) {
 			return "signed";
@@ -298,10 +308,6 @@ public boolean supportsRowValueConstructorSyntax() {
 		return true;
 	}
 
-	public Boolean performTemporaryTableDDLInIsolation() {
-		return Boolean.FALSE;
-	}
-
 
 	// Overridden informational metadata ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 

src/org/hibernate/hql/ast/exec/AbstractStatementExecutor.java

@@ -158,8 +158,10 @@ protected void dropTemporaryTableIfNecessary(final Queryable persister, final Se
 				public void doWork(Connection connection) throws HibernateException {
 					Statement stmnt = null;
 					try {
+						final String command = session.getFactory().getSettings().getDialect().getDropTemporaryTableString()
+								+ " " + persister.getTemporaryIdTableName();
 						stmnt = connection.createStatement();
-						stmnt.executeUpdate( "drop table " + persister.getTemporaryIdTableName() );
+						stmnt.executeUpdate( command );
 					}
 					catch( Throwable t ) {
 						log.warn( "unable to drop temporary id table after use [" + t.getMessage() + "]" );