/**
* Executes a generic CompiledStatement. Execution includes first building any subquery result
* dependencies and clearing them after the main result is built.
*
* @return the result of executing the statement
* @param cs any valid CompiledStatement
*/
Result execute(CompiledStatement cs) {
Result result = null;
DatabaseManager.gc();
try {
cs.materializeSubQueries(session);
result = executeImpl(cs);
} catch (Throwable t) {
// t.printStackTrace();
result = new Result(t, cs.sql);
}
// clear redundant data
cs.dematerializeSubQueries();
if (result == null) {
result = emptyResult;
}
return result;
}
/**
* Executes the command encapsulated by the cmd argument.
*
* @param cmd the command to execute
* @return the result of executing the command
*/
public Result execute(Result cmd) {
try {
if (Trace.DOASSERT) {
Trace.doAssert(!isNestedTransaction);
}
Trace.check(!isClosed, Trace.ACCESS_IS_DENIED, "Session is closed");
} catch (Throwable t) {
return new Result(t, null);
}
int type = cmd.iMode;
synchronized (dDatabase) {
if (sessionMaxRows == 0) {
currentMaxRows = cmd.iUpdateCount;
}
DatabaseManager.gc();
switch (type) {
case ResultConstants.SQLEXECUTE:
{
return cmd.getSize() > 1 ? sqlExecuteBatch(cmd) : sqlExecute(cmd);
}
case ResultConstants.SQLEXECDIRECT:
{
return cmd.getSize() > 0
? sqlExecuteBatchDirect(cmd)
: sqlExecuteDirectNoPreChecks(cmd.getMainString());
}
case ResultConstants.SQLPREPARE:
{
return sqlPrepare(cmd.getMainString(), cmd.getStatementType());
}
case ResultConstants.SQLFREESTMT:
{
return sqlFreeStatement(cmd.getStatementID());
}
case ResultConstants.GETSESSIONATTR:
{
return getAttributes();
}
case ResultConstants.SETSESSIONATTR:
{
return setAttributes(cmd);
}
case ResultConstants.SQLENDTRAN:
{
switch (cmd.getEndTranType()) {
case ResultConstants.COMMIT:
commit();
break;
case ResultConstants.ROLLBACK:
rollback();
break;
case ResultConstants.SAVEPOINT_NAME_RELEASE:
try {
String name = cmd.getMainString();
releaseSavepoint(name);
} catch (Throwable t) {
return new Result(t, null);
}
break;
case ResultConstants.SAVEPOINT_NAME_ROLLBACK:
try {
rollbackToSavepoint(cmd.getMainString());
} catch (Throwable t) {
return new Result(t, null);
}
break;
// not yet
// case ResultConstants.COMMIT_AND_CHAIN :
// case ResultConstants.ROLLBACK_AND_CHAIN :
}
return emptyUpdateCount;
}
case ResultConstants.SQLSETCONNECTATTR:
{
switch (cmd.getConnectionAttrType()) {
case ResultConstants.SQL_ATTR_SAVEPOINT_NAME:
try {
savepoint(cmd.getMainString());
} catch (Throwable t) {
return new Result(t, null);
}
// case ResultConstants.SQL_ATTR_AUTO_IPD
// - always true
// default: throw - case never happens
}
return emptyUpdateCount;
}
default:
{
String msg = "operation type:" + type;
return new Result(msg, "s1000", Trace.OPERATION_NOT_SUPPORTED);
}
}
}
}
