关于PreparedStatement.addBatch()方法

 

Statement和PreparedStatement的区别就不多废话了,直接说PreparedStatement最重要的addbatch()结构的使用.

1.建立链接,(打电话拨号 )    

   Connection    connection =getConnection();

2.不自动 Commit (瓜子不是一个一个吃,全部剥开放桌子上,然后一口舔了)

connection.setAutoCommit(false);   

3.预编译SQL语句,只编译一回哦,效率高啊.(发明一个剥瓜子的方法,以后不要总想怎么剥瓜子好.就这样剥.)
PreparedStatement statement = connection.prepareStatement("INSERT INTO TABLEX VALUES(?, ?)");   

4.来一个剥一个,然后放桌子上

//记录1
statement.setInt(1, 1);
statement.setString(2, "Cujo");
statement.addBatch();   

//记录2
statement.setInt(1, 2);
statement.setString(2, "Fred");
statement.addBatch();   

//记录3
statement.setInt(1, 3);
statement.setString(2, "Mark");
statement.addBatch();   

//批量执行上面3条语句. 一口吞了,很爽
int [] counts = statement.executeBatch();   

//Commit it 咽下去,到肚子(DB)里面
connection.commit();

stmt.addBatch("update  TABLE1 set 题目="盛夏话足部保健1"   where id="3407"");
stmt.addBatch("update  TABLE1 set 题目="夏季预防中暑膳食1" where id="3408"");
stmt.addBatch("INSERT INTO  TABLE1  VALUES("11","12","13","","")");
stmt.addBatch("INSERT INTO  TABLE1  VALUES("12","12","13","","")");
stmt.addBatch("INSERT INTO  TABLE1  VALUES("13","12","13","","")");
stmt.addBatch("INSERT INTO  TABLE1  VALUES("14","12","13","","")");
stmt.addBatch("INSERT INTO  TABLE1  VALUES("15","12","13","","")");
stmt.addBatch("INSERT INTO  TABLE1  VALUES("16","12","13","","")");
stmt.addBatch("INSERT INTO  TABLE1  VALUES("17","12","13","","")");
stmt.addBatch("INSERT INTO  TABLE1  VALUES("18","12","13","","")");

int [] updateCounts=stmt.executeBatch();
cn.commit();

例如:

    public static void execteBatch(Connection conn)throws Exception{
        String sql1 = "delete from student where id =3 ";
        String sql2 = "delete from student where id =5 ";
        String sql3 = "delete from student where id =6 ";
        String sql4 = "delete from student where id =7 ";
        PreparedStatement pstmt = conn.prepareStatement(sql1);
        pstmt.addBatch();
        pstmt.addBatch(sql2);
        pstmt.addBatch(sql3);
        pstmt.addBatch(sql4);
        pstmt.executeBatch();
    };