关于PreparedStatement.addBatch()方法
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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();
引自：：http://hi.baidu.com/charlielogic/blog/item/69b8775536da18c0b645ae36.html/cmtid/46c7ef5846b338d29d820434
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();
??? };
