如何在Java JDBC的帮助下运行多个Delete sql语句？

Question

I want to delete three different tables at once and I have create a pretty simple SQL statement for that matter as following :

DELETE FROM tbl1;DELETE FROM tbl2;DELETE FROM tbl3;

this statement is correct when I run in mysql directly but from java no!

my java code :

public boolean clearTables()
     {
         boolean ans = false;
         if (con != null)
         {
             try
             {
                String deleteQuery = "    DELETE FROM tbl1;DELETE FROM tbl2;DELETE FROM tbl3;";
                Statement st = con.createStatement();
                st.execute(deleteQuery);

                ans = true;
             }
             catch (Exception e) 
             {
                e.printStackTrace();
                ans= false;
             }
         }
         return ans;
     }

how can I run multiple SQL statements at once in java?

Answer 1

Use addBatch then executeBatch :

   Statement st = con.createStatement();
   st.addBatch("DELETE FROM tbl1");
   st.addBatch("DELETE FROM tbl2");
   st.addBatch("DELETE FROM tbl3");
   int[] results = st.executeBatch();

Then results will contain an array with the number of rows deleted from each table.

Answer 2

use batch updates

http://docs.oracle.com/javase/1.3/docs/guide/jdbc/spec2/jdbc2.1.frame6.html