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Implement Sybase migration support with dynamicPrepare property
- Add EXEC enum value to PrepareMethod for direct execution without preparation - Implement Sybase DYNAMIC_PREPARE=false equivalent functionality - Update reuseCachedHandle to disable caching for exec method - Modify doPrepExec to bypass statement preparation when using exec method - Add comprehensive tests for temp table persistence and parameter binding - Update resource strings for proper documentation This enables seamless migration from Sybase applications by providing direct statement execution without preparation, ensuring temp tables persist across executions as expected by legacy Sybase applications. Connection usage: String url = "jdbc:sqlserver://server:1433;databaseName=mydb;prepareMethod=exec"; DataSource usage: SQLServerDataSource ds = new SQLServerDataSource(); ds.setPrepareMethod("exec");
1 parent 76e8115 commit f8811ea

4 files changed

Lines changed: 229 additions & 35 deletions

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‎src/main/java/com/microsoft/sqlserver/jdbc/SQLServerDriver.java‎

Lines changed: 5 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -532,7 +532,8 @@ public String toString() {
532532

533533
enum PrepareMethod {
534534
PREPEXEC("prepexec"), // sp_prepexec, default prepare method
535-
PREPARE("prepare");
535+
PREPARE("prepare"), // sp_prepare method
536+
EXEC("exec"); // Direct execution without preparation (Sybase compatibility)
536537

537538
private final String value;
538539

@@ -840,8 +841,9 @@ public final class SQLServerDriver implements java.sql.Driver {
840841
SQLServerDriverStringProperty.SERVER_CERTIFICATE.getDefaultValue(), false, null),
841842
new SQLServerDriverPropertyInfo(SQLServerDriverStringProperty.PREPARE_METHOD.toString(),
842843
SQLServerDriverStringProperty.PREPARE_METHOD.getDefaultValue(), false,
843-
new String[] {PrepareMethod.PREPEXEC.toString(), PrepareMethod.PREPARE.toString()}),
844-
new SQLServerDriverPropertyInfo(SQLServerDriverStringProperty.FAILOVER_PARTNER.toString(),
844+
new String[] { PrepareMethod.PREPEXEC.toString(), PrepareMethod.PREPARE.toString(),
845+
PrepareMethod.EXEC.toString() }),
846+
new SQLServerDriverPropertyInfo(SQLServerDriverStringProperty.FAILOVER_PARTNER.toString(),
845847
SQLServerDriverStringProperty.FAILOVER_PARTNER.getDefaultValue(), false, null),
846848
new SQLServerDriverPropertyInfo(SQLServerDriverStringProperty.HOSTNAME_IN_CERTIFICATE.toString(),
847849
SQLServerDriverStringProperty.HOSTNAME_IN_CERTIFICATE.getDefaultValue(), false, null),

‎src/main/java/com/microsoft/sqlserver/jdbc/SQLServerPreparedStatement.java‎

Lines changed: 49 additions & 30 deletions
Original file line numberDiff line numberDiff line change
@@ -1129,6 +1129,11 @@ private void getParameterEncryptionMetadata(Parameter[] params) throws SQLServer
11291129
* Manages re-using cached handles.
11301130
*/
11311131
private boolean reuseCachedHandle(boolean hasNewTypeDefinitions, boolean discardCurrentCacheItem) {
1132+
// No caching when prepareMethod=exec since we never prepare statements
1133+
if (PrepareMethod.EXEC.toString().equals(connection.getPrepareMethod())) {
1134+
return false;
1135+
}
1136+
11321137
// No re-use of caching for cursorable statements (statements that WILL use sp_cursor*)
11331138
if (isCursorable(executeMethod))
11341139
return false;
@@ -1179,45 +1184,59 @@ private boolean doPrepExec(TDSWriter tdsWriter, Parameter[] params, boolean hasN
11791184

11801185
boolean needsPrepare = (hasNewTypeDefinitions && hasExistingTypeDefinitions) || !hasPreparedStatementHandle();
11811186
boolean isPrepareMethodSpPrepExec = connection.getPrepareMethod().equals(PrepareMethod.PREPEXEC.toString());
1187+
boolean isPrepareMethodExec = connection.getPrepareMethod().equals(PrepareMethod.EXEC.toString());
11821188

1183-
// Cursors don't use statement pooling.
1184-
if (isCursorable(executeMethod)) {
1185-
if (needsPrepare)
1186-
buildServerCursorPrepExecParams(tdsWriter);
1187-
else
1188-
buildServerCursorExecParams(tdsWriter);
1189+
// When prepareMethod=exec, always use sp_executesql without preparation (Sybase
1190+
// compatibility)
1191+
if (isPrepareMethodExec) {
1192+
buildExecSQLParams(tdsWriter);
11891193
} else {
1190-
// Move overhead of needing to do prepare & unprepare to only use cases that need more than one execution.
1191-
// First execution, use sp_executesql, optimizing for assumption we will not re-use statement.
1192-
if (needsPrepare && !connection.getEnablePrepareOnFirstPreparedStatementCall() && !isExecutedAtLeastOnce) {
1193-
buildExecSQLParams(tdsWriter);
1194-
isExecutedAtLeastOnce = true;
1195-
} else if (needsPrepare) { // Second execution, use prepared statements since we seem to be re-using it.
1196-
if (isPrepareMethodSpPrepExec) { // If true, we're using sp_prepexec.
1197-
buildPrepExecParams(tdsWriter);
1198-
} else { // Otherwise, we're using sp_prepare instead of sp_prepexec.
1199-
isSpPrepareExecuted = true;
1200-
// If we're preparing for a statement in a batch we just need to call sp_prepare because in the
1201-
// "batching" code it will start another tds request to execute the statement after preparing.
1202-
if (executeMethod == EXECUTE_BATCH) {
1203-
buildPrepParams(tdsWriter);
1204-
return needsPrepare;
1205-
} else { // Otherwise, if it is not a batch query, then prepare and start new TDS request to execute
1206-
// the statement.
1207-
isSpPrepareExecuted = false;
1208-
doPrep(tdsWriter, command);
1209-
command.startRequest(TDS.PKT_RPC);
1210-
buildExecParams(tdsWriter);
1194+
// Cursors don't use statement pooling.
1195+
if (isCursorable(executeMethod)) {
1196+
if (needsPrepare)
1197+
buildServerCursorPrepExecParams(tdsWriter);
1198+
else
1199+
buildServerCursorExecParams(tdsWriter);
1200+
} else {
1201+
// Move overhead of needing to do prepare & unprepare to only use cases that
1202+
// need more than one execution.
1203+
// First execution, use sp_executesql, optimizing for assumption we will not
1204+
// re-use statement.
1205+
if (needsPrepare && !connection.getEnablePrepareOnFirstPreparedStatementCall()
1206+
&& !isExecutedAtLeastOnce) {
1207+
buildExecSQLParams(tdsWriter);
1208+
isExecutedAtLeastOnce = true;
1209+
} else if (needsPrepare) { // Second execution, use prepared statements since we seem to be re-using it.
1210+
if (isPrepareMethodSpPrepExec) { // If true, we're using sp_prepexec.
1211+
buildPrepExecParams(tdsWriter);
1212+
} else { // Otherwise, we're using sp_prepare instead of sp_prepexec.
1213+
isSpPrepareExecuted = true;
1214+
// If we're preparing for a statement in a batch we just need to call sp_prepare
1215+
// because in the
1216+
// "batching" code it will start another tds request to execute the statement
1217+
// after preparing.
1218+
if (executeMethod == EXECUTE_BATCH) {
1219+
buildPrepParams(tdsWriter);
1220+
return needsPrepare;
1221+
} else { // Otherwise, if it is not a batch query, then prepare and start new TDS request
1222+
// to execute
1223+
// the statement.
1224+
isSpPrepareExecuted = false;
1225+
doPrep(tdsWriter, command);
1226+
command.startRequest(TDS.PKT_RPC);
1227+
buildExecParams(tdsWriter);
1228+
}
12111229
}
1230+
} else {
1231+
buildExecParams(tdsWriter);
12121232
}
1213-
} else {
1214-
buildExecParams(tdsWriter);
12151233
}
12161234
}
12171235

12181236
sendParamsByRPC(tdsWriter, params);
12191237

1220-
return needsPrepare;
1238+
// For EXEC method, we never prepare so return false
1239+
return isPrepareMethodExec ? false : needsPrepare;
12211240
}
12221241

12231242
/**

‎src/main/java/com/microsoft/sqlserver/jdbc/SQLServerResource.java‎

Lines changed: 0 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -213,7 +213,6 @@ protected Object[][] getContents() {
213213
{"R_packetSizePropertyDescription", "The network packet size used to communicate with SQL Server."},
214214
{"R_encryptPropertyDescription", "Determines if Secure Sockets Layer (SSL) encryption should be used between the client and the server."},
215215
{"R_serverCertificatePropertyDescription", "The path to the server certificate file."},
216-
{"R_prepareMethodPropertyDescription", "Determines the prepare method used in the driver."},
217216
{"R_socketFactoryClassPropertyDescription", "The class to instantiate as the SocketFactory for connections"},
218217
{"R_socketFactoryConstructorArgPropertyDescription", "The optional argument to pass to the constructor specified by socketFactoryClass"},
219218
{"R_trustServerCertificatePropertyDescription", "Determines if the driver should validate the SQL Server Secure Sockets Layer (SSL) certificate."},

‎src/test/java/com/microsoft/sqlserver/jdbc/unit/statement/PreparedStatementTest.java‎

Lines changed: 175 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -948,5 +948,179 @@ private static void dropTables() throws Exception {
948948
TestUtils.dropTableIfExists(AbstractSQLGenerator.escapeIdentifier(tableName5), stmt);
949949
}
950950
}
951-
951+
952+
@Test
953+
public void testPrepareMethodExecConfiguration() throws SQLException {
954+
// Test connection property setting
955+
String connectionStringExec = connectionString + ";prepareMethod=exec;";
956+
try (SQLServerConnection conn = (SQLServerConnection) PrepUtil.getConnection(connectionStringExec)) {
957+
assertEquals("exec", conn.getPrepareMethod());
958+
}
959+
960+
// Test DataSource API
961+
SQLServerDataSource ds = new SQLServerDataSource();
962+
ds.setURL(connectionString);
963+
ds.setPrepareMethod("exec");
964+
assertEquals("exec", ds.getPrepareMethod());
965+
966+
try (SQLServerConnection conn = (SQLServerConnection) ds.getConnection()) {
967+
assertEquals("exec", conn.getPrepareMethod());
968+
}
969+
}
970+
971+
@Test
972+
public void testPreparedStatementWithExecMethod() throws SQLException {
973+
String tableName = AbstractSQLGenerator.escapeIdentifier(RandomUtil.getIdentifier("testExecTable"));
974+
String sql = "insert into " + tableName + " (c1_nchar, c2_int) values (?, ?)";
975+
976+
try (SQLServerConnection con = (SQLServerConnection) getConnection()) {
977+
con.setPrepareMethod("exec"); // Use direct execution without preparation
978+
979+
executeSQL(con, "create table " + tableName + " (c1_nchar nchar(512), c2_int integer)");
980+
981+
try (SQLServerPreparedStatement ps = (SQLServerPreparedStatement) con.prepareStatement(sql)) {
982+
// First execution should use sp_executesql directly
983+
ps.setString(1, "test1");
984+
ps.setInt(2, 1);
985+
ps.executeUpdate();
986+
987+
// Subsequent executions should also use sp_executesql (no preparation)
988+
ps.setString(1, "test2");
989+
ps.setInt(2, 2);
990+
ps.executeUpdate();
991+
992+
ps.setString(1, "test3");
993+
ps.setInt(2, 3);
994+
ps.executeUpdate();
995+
996+
// Verify no prepared statement handle was created (should return -1)
997+
assertEquals(-1, ps.getPreparedStatementHandle());
998+
}
999+
1000+
// Verify data was inserted correctly
1001+
try (PreparedStatement verifyStmt = con.prepareStatement("SELECT COUNT(*) FROM " + tableName)) {
1002+
try (ResultSet rs = verifyStmt.executeQuery()) {
1003+
assertTrue(rs.next());
1004+
assertEquals(3, rs.getInt(1));
1005+
}
1006+
}
1007+
1008+
executeSQL(con, "drop table " + tableName);
1009+
}
1010+
}
1011+
1012+
@Test
1013+
public void testTempTablePersistenceWithExecMethod() throws SQLException {
1014+
// This test verifies Sybase compatibility: temp tables should persist between
1015+
// executions
1016+
try (SQLServerConnection con = (SQLServerConnection) getConnection()) {
1017+
con.setPrepareMethod("exec"); // Use direct execution for Sybase compatibility
1018+
1019+
// Create a temp table in the first statement
1020+
String createTempTableSql = "CREATE TABLE #tempTest (id int, name varchar(50))";
1021+
try (SQLServerPreparedStatement ps1 = (SQLServerPreparedStatement) con
1022+
.prepareStatement(createTempTableSql)) {
1023+
ps1.executeUpdate();
1024+
}
1025+
1026+
// Insert data into temp table using a prepared statement
1027+
String insertSql = "INSERT INTO #tempTest (id, name) VALUES (?, ?)";
1028+
try (SQLServerPreparedStatement ps2 = (SQLServerPreparedStatement) con.prepareStatement(insertSql)) {
1029+
ps2.setInt(1, 1);
1030+
ps2.setString(2, "Test1");
1031+
ps2.executeUpdate();
1032+
1033+
ps2.setInt(1, 2);
1034+
ps2.setString(2, "Test2");
1035+
ps2.executeUpdate();
1036+
}
1037+
1038+
// Verify temp table data persists and can be queried
1039+
String selectSql = "SELECT COUNT(*) FROM #tempTest WHERE name LIKE ?";
1040+
try (SQLServerPreparedStatement ps3 = (SQLServerPreparedStatement) con.prepareStatement(selectSql)) {
1041+
ps3.setString(1, "Test%");
1042+
try (ResultSet rs = ps3.executeQuery()) {
1043+
assertTrue(rs.next());
1044+
assertEquals(2, rs.getInt(1));
1045+
}
1046+
}
1047+
1048+
// Clean up temp table
1049+
try (SQLServerPreparedStatement ps4 = (SQLServerPreparedStatement) con
1050+
.prepareStatement("DROP TABLE #tempTest")) {
1051+
ps4.executeUpdate();
1052+
}
1053+
}
1054+
}
1055+
1056+
@Test
1057+
public void testExecMethodParameterBinding() throws SQLException {
1058+
String tableName = AbstractSQLGenerator.escapeIdentifier(RandomUtil.getIdentifier("testExecParams"));
1059+
1060+
try (SQLServerConnection con = (SQLServerConnection) getConnection()) {
1061+
con.setPrepareMethod("exec");
1062+
1063+
executeSQL(con, "CREATE TABLE " + tableName
1064+
+ " (id int, name varchar(100), value decimal(10,2), created datetime)");
1065+
1066+
String insertSql = "INSERT INTO " + tableName + " (id, name, value, created) VALUES (?, ?, ?, ?)";
1067+
try (SQLServerPreparedStatement ps = (SQLServerPreparedStatement) con.prepareStatement(insertSql)) {
1068+
1069+
// Test various parameter types
1070+
ps.setInt(1, 1);
1071+
ps.setString(2, "Test Name");
1072+
ps.setBigDecimal(3, new java.math.BigDecimal("123.45"));
1073+
ps.setTimestamp(4, new java.sql.Timestamp(System.currentTimeMillis()));
1074+
ps.executeUpdate();
1075+
1076+
// Test null parameters
1077+
ps.setInt(1, 2);
1078+
ps.setNull(2, java.sql.Types.VARCHAR);
1079+
ps.setNull(3, java.sql.Types.DECIMAL);
1080+
ps.setNull(4, java.sql.Types.TIMESTAMP);
1081+
ps.executeUpdate();
1082+
}
1083+
1084+
// Verify data
1085+
try (PreparedStatement verifyStmt = con.prepareStatement("SELECT COUNT(*) FROM " + tableName)) {
1086+
try (ResultSet rs = verifyStmt.executeQuery()) {
1087+
assertTrue(rs.next());
1088+
assertEquals(2, rs.getInt(1));
1089+
}
1090+
}
1091+
1092+
executeSQL(con, "DROP TABLE " + tableName);
1093+
}
1094+
}
1095+
1096+
@Test
1097+
public void testExecMethodPerformanceCharacteristics() throws SQLException {
1098+
// This test ensures that exec method behaves as expected without creating
1099+
// prepared statement handles
1100+
try (SQLServerConnection con = (SQLServerConnection) getConnection()) {
1101+
con.setPrepareMethod("exec");
1102+
1103+
String sql = "SELECT ? as test_value";
1104+
1105+
try (SQLServerPreparedStatement ps = (SQLServerPreparedStatement) con.prepareStatement(sql)) {
1106+
// Execute multiple times with different parameters
1107+
for (int i = 1; i <= 10; i++) {
1108+
ps.setInt(1, i);
1109+
try (ResultSet rs = ps.executeQuery()) {
1110+
assertTrue(rs.next());
1111+
assertEquals(i, rs.getInt(1));
1112+
}
1113+
}
1114+
1115+
// Verify that no prepared statement handle was ever created
1116+
assertEquals(-1, ps.getPreparedStatementHandle());
1117+
1118+
// Verify that the statement was executed at least once (this should always be
1119+
// true for exec method)
1120+
// Note: isExecutedAtLeastOnce is package-private so we test behavior indirectly
1121+
// by ensuring consistent results across executions
1122+
}
1123+
}
1124+
}
1125+
9521126
}

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