Statement和PreparedStatement的區別就不多廢話了,直接說PreparedStatement最重要的addbatch()結構的使用.
1.建立鏈接,(打電話撥號 )
Connection connection =getConnection();
2.不自動 Commit (瓜子不是一個一個吃,全部剝開放桌子上,然後一口舔了)
connection.setAutoCommit(false);
3.預編譯SQL語句,只編譯一回哦,效率高啊.(發明一個剝瓜子的方法,以後不要總想怎麼剝瓜子好.就這樣剝.)
PreparedStatement statement = connection.prepareStatement("INSERT INTO TABLEX VALUES(?, ?)");
4.來一個剝一個,然後放桌子上
//記錄1
statement.setInt(1, 1);
statement.setString(2, "Cujo");
statement.addBatch();
//記錄2
statement.setInt(1, 2);
statement.setString(2, "Fred");
statement.addBatch();
//記錄3
statement.setInt(1, 3);
statement.setString(2, "Mark");
statement.addBatch();
//批量執行上面3條語句. 一口吞了,很爽
int [] counts = statement.executeBatch();
//Commit it 嚥下去,到肚子(DB)裏面
connection.commit();
stmt.addBatch("update TABLE1 set 題目="盛夏話足部保健1" where id="3407"");
stmt.addBatch("update TABLE1 set 題目="夏季預防中暑膳食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();
};