我想知道Java是否有可能
String A = "UPDATE blah set x=? y=? z=?" String B = "UPDATE blah set a=? b=? c=? d=?"
我想有一个准备好的声明,主要是为了提高速度,其次是为了提高安全性。我希望能够填写A的绑定变量,执行A,B的绑定变量并执行B,然后提交整个事务。有没有更好的方法可以做到这一点?
您可以利用多个PreparedStatement获得所需的结果:
// Prepare code for PreparedStatement #1 String varOne = "A"; String varTwo = "B"; String varThree = "C"; String queryOne = "UPDATE blah set x=? y=? z=?" PreparedStatement firstStmt = conn.prepareStatement(queryOne); firstStmt.setString(1, varOne); firstStmt.setString(2, varTwo); firstStmt.setString(3, varThree); firstStmt.executeUpdate(); conn.commit(); // Prepare code for PreparedStatement #2 String varOneB = "X"; String varTwoB = "Y"; String varThreeB = "Z"; String varFourB = "A"; String queryOne = "UPDATE blah set a=? b=? c=? d=?" PreparedStatement secondStmt = conn.prepareStatement(queryTwo); secondStmt.setString(1, varOneB); secondStmt.setString(2, varTwoB); secondStmt.setString(3, varThreeB); secondStmt.executeUpdate(); conn.commit();