标签:
做游戏客户端多一年多了,在大学学的java的SSH,基本上都忘完了,今天看了一下发现基本的连接数据库的都忘了。。。太可怕了这遗忘的速度。
所以写了个连接的例子吧。。安装好mysql数据库之后新建了两张表tx1,tx2。接下来连接数据库,往前面两张表里插入数据。
首先是公共连接类:
TestConnection.java
package cn.wan; import java.sql.Connection; import java.sql.*; public class TestConnection { private String driver; private String url; private String dbName; private String password; Connection conn; Statement sta; PreparedStatement prepare; public TestConnection() { this.driver = "com.mysql.jdbc.Driver"; this.url = "jdbc:mysql://localhost:3306/tx"; this.dbName = "root"; this.password = "126"; } public Connection getConnection()throws Exception { try { Class.forName(driver); conn = DriverManager.getConnection(url, dbName, password); } catch (Exception e) { e.printStackTrace(); } return conn; } public void closeConn() { try { if(this.conn!=null) { this.conn.close(); } } catch (Exception e) { // TODO: handle exception e.printStackTrace(); } } }
使用Statement类向tx1中插入数据,值得注意的是tx1表的key是整型的,所以注意插入数据的写法。。
package cn.wan; import java.sql.Connection; import java.sql.Statement; public class TestStatement { // private static TestConnection connection; public static void main(String[] args)throws Exception { Connection conn; Statement state = null; Long start = System.currentTimeMillis(); TestConnection connection =new TestConnection(); try { conn = connection.getConnection(); state = conn.createStatement(); // 需要使用100条sql语句来插入数据 for(int i= 0;i<100;i++) { int num= i; String str2 = "name"+i; state.executeUpdate("insert into tx1 values(‘"+num+"‘,‘str"+i+"‘)"); } System.out.println("使用Statement费时:"+(System.currentTimeMillis()- start)); } catch (Exception e) { // TODO: handle exception e.printStackTrace(); }finally { connection.closeConn(); if(state !=null) { state.close(); } } } }
使用PreparedStatement类向tx2表中插入数据,也要注意他的语句的写法:
package cn.wan; import java.sql.Connection; import java.sql.PreparedStatement; import java.sql.Statement; public class TestPrepared { public static void main(String[] args)throws Exception { String sqlString = "insert into tx2 values(?,?)"; Connection conn= null; PreparedStatement state = null; Long startLong = System.currentTimeMillis(); TestConnection connection = new TestConnection(); try { conn = connection.getConnection(); // 使用Connection来创建一个PreparedStatemet对象 state = conn.prepareStatement(sqlString); // 100次为PreparedStatemet的参数赋值,就能插入100条记录 for(int i = 0;i<100;i++) { state.setInt(1, i); state.setString(2, i+""); state.executeUpdate(); } System.out.println("使用PreparedStatemet耗时:"+(System.currentTimeMillis()-startLong)); } catch (Exception e) { // TODO: handle exception e.printStackTrace(); } finally { connection.closeConn(); if(state !=null) { state.close(); } } } }
至此连接和两种不同的数据插入就已经完成了。。
标签:
原文地址:http://www.cnblogs.com/duhuo/p/4276226.html