Java批量插入更新操作

以前总是说批量插入和更新的效率比非批量的要高，但是一直没有使用过批量处理数据的功能，现在由于项目中需要处理的数据量比较大，所以使用了批量处理的功能，java代码如下：

1.java实现批量插入数据：

 Connection conn;
        try {
            Class.forName("com.mysql.jdbc.Driver");
            conn = DriverManager.getConnection("jdbc:mysql://192.168.0.200:3306/xxx", "root", "root");
            conn.setAutoCommit(false);
            String sql = "insert into test_user (u_name,create_date) value (?,SYSDATE())";
            PreparedStatement prest = conn.prepareStatement(sql, ResultSet.TYPE_SCROLL_SENSITIVE,
                    ResultSet.CONCUR_READ_ONLY);
            conn.setAutoCommit(false);

            for (int i = 1; i <= 100; i++) {
                prest.setString(1, "a" + i);
                prest.addBatch();
            }
            prest.executeBatch();
            conn.commit();


            conn.close();
        } catch (Exception ex) {
            ex.printStackTrace();
        }

2.java实现批量更新数据：

Connection conn;
        try {
            Class.forName("com.mysql.jdbc.Driver");
            conn = DriverManager.getConnection("jdbc:mysql://192.168.0.200:3306/xxx", "root", "root");
            conn.setAutoCommit(false);

            // 保存当前自动提交模式
            boolean autoCommit = conn.getAutoCommit();
            // 关闭自动提交
            conn.setAutoCommit(false);
             Statement stmt =conn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_READ_ONLY); 

            for (int i = 1; i <= num; i++) {
                //通过遍历可以一次性插入多条sql语句
                stmt.addBatch("update test_user set test_user.u_name = ('d"+i+"') where test_user.u_name = ('c"+i+"')"); 
            }

            stmt.executeBatch();   
            stmt.clearBatch();
            conn.commit(); 
            conn.close();
        } catch (Exception ex) {
            ex.printStackTrace();
        }