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();

    };