JDBC Batch执行速度极慢

Question

任何人都可以告诉我我做错了什么我在mysql中执行350个插件并且它需要40秒.

这是代码

long t0 = System.currentTimeMillis();
        Connection con = connectionProvider.getConnection();
        PreparedStatement s = con.prepareStatement("insert into domkee.friends(idFriends,friend1Id,friend2Id,friend2Name) values(?,?,?,?)");
        con.setAutoCommit(false);
        for (Friend f : friends) {
            s.setLong(1, 0);
            s.setLong(2, f.getFriend1Id());
            s.setLong(3, f.getFriend2Id());
            s.setString(4, f.getFriend2Name());
            s.addBatch();

        }
        long t1 = System.currentTimeMillis() - t0;
        s.executeBatch();
        long t2 = System.currentTimeMillis()-t0;
        con.commit();
        long t3 = System.currentTimeMillis()-t0;
        s.close();
        con.close();
        long t4 = System.currentTimeMillis()-t0;
        System.out.println(((double)t1/1000) + ";" + ((double)t2/1000) + ";" + ((double)t3/1000) + ";" + ((double)t4/1000));

这是控制台:

0.156;39.251;39.376;39.486

所以这.executeBatch()是40秒,这可能是什么问题？

Answer 1

添加?rewriteBatchedStatements=true到JDBC url的末尾.它会给你带来严重的性能提升.请注意,这是特定于MySql的,不会对任何其他JDBC驱动程序产生任何影响.