question: public static synchronized boolean execute ( String sqlStatement ) { boolean executeOk = false ; logger . trace ( String . format ( "execute( %s ) -->entry" , sqlStatement ) ) ; final Statement S = getStatement ( ) ; if ( S == null ) { logger . error ( "execute() <--exit (error: Statement unavailable)" ) ; return false ; } try { executeOk = S . execute ( sqlStatement ) ; } catch ( Throwable t ) { surfaceThrowable ( String . format ( "execute( %s )" , sqlStatement ) , t ) ; } finally { cleanup ( S ) ; } logger . trace ( "execute() <--exit (normal): " + executeOk ) ; return executeOk ; }
target:  This method is a thin wrapper for the JDBC execute. It is offered in this way to ensure consistency of error logging. WARNING: boolean return value here comes from JDBC and is not fully understood at this time.  It may return false even when dml is successfully executed, so cannot be used as a judgment of statement execution success.