/**
* Executes an arbitrary statement. If another result set exists for this statement, this will be
* closed (even if this statement fails).
*
* <p>If the statement is a create or drop and does not throw an exception, the current
* transaction (if any) is committed after executing the statement. If auto commit is on, and the
* statement is not a select, this statement will be committed.
*
* @param sql the SQL statement to execute
* @return true if a result set is available, false if not
*/
public boolean execute(String sql) throws SQLException {
try {
int id = getNextId(TraceObject.RESULT_SET);
if (isDebugEnabled()) {
debugCodeCall("execute", sql);
}
checkClosedForWrite();
closeOldResultSet();
sql = conn.translateSQL(sql, escapeProcessing);
CommandInterface command = conn.prepareCommand(sql, fetchSize);
boolean returnsResultSet;
synchronized (session) {
setExecutingStatement(command);
try {
if (command.isQuery()) {
returnsResultSet = true;
boolean scrollable = resultSetType != ResultSet.TYPE_FORWARD_ONLY;
boolean updatable = resultSetConcurrency == ResultSet.CONCUR_UPDATABLE;
ResultInterface result = command.executeQuery(maxRows, scrollable);
resultSet =
new JdbcResultSet(conn, this, result, id, closedByResultSet, scrollable, updatable);
} else {
returnsResultSet = false;
updateCount = command.executeUpdate();
}
} finally {
setExecutingStatement(null);
}
}
command.close();
return returnsResultSet;
} catch (Exception e) {
throw logAndConvert(e);
}
}
/**
* Executes a query (select statement) and returns the result set. If another result set exists
* for this statement, this will be closed (even if this statement fails).
*
* @param sql the SQL statement to execute
* @return the result set
*/
public ResultSet executeQuery(String sql) throws SQLException {
try {
int id = getNextId(TraceObject.RESULT_SET);
if (isDebugEnabled()) {
debugCodeAssign(
"ResultSet", TraceObject.RESULT_SET, id, "executeQuery(" + quote(sql) + ")");
}
checkClosed();
closeOldResultSet();
sql = conn.translateSQL(sql, escapeProcessing);
synchronized (session) {
CommandInterface command = conn.prepareCommand(sql, fetchSize);
ResultInterface result;
boolean scrollable = resultSetType != ResultSet.TYPE_FORWARD_ONLY;
boolean updatable = resultSetConcurrency == ResultSet.CONCUR_UPDATABLE;
setExecutingStatement(command);
try {
result = command.executeQuery(maxRows, scrollable);
} finally {
setExecutingStatement(null);
}
command.close();
resultSet =
new JdbcResultSet(conn, this, result, id, closedByResultSet, scrollable, updatable);
}
return resultSet;
} catch (Exception e) {
throw logAndConvert(e);
}
}
/**
* Returns the current transaction isolation level.
*
* @return the isolation level.
* @throws SQLException if the connection is closed
*/
public int getTransactionIsolation() throws SQLException {
try {
debugCodeCall("getTransactionIsolation");
checkClosed();
getLockMode = prepareCommand("CALL LOCK_MODE()", getLockMode);
ResultInterface result = getLockMode.executeQuery(0, false);
result.next();
int lockMode = result.currentRow()[0].getInt();
result.close();
int transactionIsolationLevel;
switch (lockMode) {
case Constants.LOCK_MODE_OFF:
transactionIsolationLevel = Connection.TRANSACTION_READ_UNCOMMITTED;
break;
case Constants.LOCK_MODE_READ_COMMITTED:
transactionIsolationLevel = Connection.TRANSACTION_READ_COMMITTED;
break;
case Constants.LOCK_MODE_TABLE:
case Constants.LOCK_MODE_TABLE_GC:
transactionIsolationLevel = Connection.TRANSACTION_SERIALIZABLE;
break;
default:
throw DbException.throwInternalError("lockMode:" + lockMode);
}
return transactionIsolationLevel;
} catch (Exception e) {
throw logAndConvert(e);
}
}
private boolean getInternalAutoCommit() {
getAutoCommit = prepareCommand("CALL AUTOCOMMIT()", getAutoCommit);
ResultInterface result = getAutoCommit.executeQuery(0, false);
result.next();
boolean autoCommit = result.currentRow()[0].getBoolean().booleanValue();
result.close();
return autoCommit;
}
/**
* Returns true if the database is read-only.
*
* @return if the database is read-only
* @throws SQLException if the connection is closed
*/
public boolean isReadOnly() throws SQLException {
try {
debugCodeCall("isReadOnly");
checkClosed();
getReadOnly = prepareCommand("CALL READONLY()", getReadOnly);
ResultInterface result = getReadOnly.executeQuery(0, false);
result.next();
boolean readOnly = result.currentRow()[0].getBoolean().booleanValue();
return readOnly;
} catch (Exception e) {
throw logAndConvert(e);
}
}
/**
* Gets the current catalog name.
*
* @return the catalog name
* @throws SQLException if the connection is closed
*/
public String getCatalog() throws SQLException {
try {
debugCodeCall("getCatalog");
checkClosed();
if (catalog == null) {
CommandInterface cat = prepareCommand("CALL DATABASE()", Integer.MAX_VALUE);
ResultInterface result = cat.executeQuery(0, false);
result.next();
catalog = result.currentRow()[0].getString();
cat.close();
}
return catalog;
} catch (Exception e) {
throw logAndConvert(e);
}
}
/**
* Read the serializer name from the persistent database settings.
*
* @return the serializer
*/
private String readSerializationSettings() {
String javaObjectSerializerFQN = null;
CommandInterface ci =
prepareCommand(
"SELECT VALUE FROM INFORMATION_SCHEMA.SETTINGS "
+ " WHERE NAME='JAVA_OBJECT_SERIALIZER'",
Integer.MAX_VALUE);
try {
ResultInterface result = ci.executeQuery(0, false);
if (result.next()) {
Value[] row = result.currentRow();
javaObjectSerializerFQN = row[0].getString();
}
} finally {
ci.close();
}
return javaObjectSerializerFQN;
}
/** INTERNAL */
public int getQueryTimeout() throws SQLException {
try {
debugCodeCall("getQueryTimeout");
checkClosed();
getQueryTimeout =
prepareCommand(
"SELECT VALUE FROM INFORMATION_SCHEMA.SETTINGS WHERE NAME=?", getQueryTimeout);
getQueryTimeout.getParameters().get(0).setValue(ValueString.get("QUERY_TIMEOUT"), false);
ResultInterface result = getQueryTimeout.executeQuery(0, false);
result.next();
int queryTimeout = result.currentRow()[0].getInt();
result.close();
if (queryTimeout == 0) {
return 0;
}
// round to the next second, otherwise 999 millis would return 0 seconds
return (queryTimeout + 999) / 1000;
} catch (Exception e) {
throw logAndConvert(e);
}
}
/** INTERNAL */
ResultSet getGeneratedKeys(JdbcStatement stat, int id) {
getGeneratedKeys = prepareCommand("CALL SCOPE_IDENTITY()", getGeneratedKeys);
ResultInterface result = getGeneratedKeys.executeQuery(0, false);
ResultSet rs = new JdbcResultSet(this, stat, result, id, false, true, false);
return rs;
}
