JAVA OOP 第八章JDBC练习+Basedao

package ls.happy1;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;

public class Test1select {

public static void main(String[] args) throws Exception {
// TODO Auto-generated method stub
String driver="com.microsoft.sqlserver.jdbc.SQLServerDriver";
String url="jdbc:sqlserver://localhost:1433;DatabaseName=subway";
String username="sa";
String pwd="1";
Class.forName(driver);

Connection con=DriverManager.getConnection(url, username, pwd);
String sql="select * from subwayinfo";
Statement state=con.createStatement();
ResultSet rs=state.executeQuery(sql);
while(rs.next()){

String subwayname=rs.getString("subwayname");
System.out.println(subwayname);
}
rs.close();
state.close();
con.close();
}

}

package ls.happy1;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.Statement;

public class Test {

public static void main(String[] args) throws Exception{
// TODO Auto-generated method stub
//
String driver="com.microsoft.sqlserver.jdbc.SQLServerDriver";
String url="jdbc:sqlserver://192.168.60.124:1433;DatabaseName=MySchool";
String username="sa";
String pwd="6375196";
Class.forName(driver);
Connection con=DriverManager.getConnection(url, username, pwd);
String sql="insert into Work values('Smith',6000,'excellerate your efforts.')";
Statement state=con.createStatement();
int count= state.executeUpdate(sql);
if(count>0){
System.out.println("添加成功！！");
}
state.close();
con.close();

}
}

package cn.happy2.com;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.Statement;
import java.util.concurrent.Executors;

public class JDBCupdate {

public static void main(String[] args) throws Exception{
// TODO Auto-generated method stub
String driver="com.microsoft.sqlserver.jdbc.SQLServerDriver";
String url="jdbc:sqlserver://localhost:1433;DatabaseName=MySchool";
String username="sa";
String pwd="1";
Class.forName(driver);
Connection con=DriverManager.getConnection(url, username, pwd);
String sql="update IsLogin set pwd='1'where id=3";
Statement state=con.createStatement();
int count= state.executeUpdate(sql);
if(count>0){
System.out.println("修改成功！！");
}
state.close();
con.close();

}
}

package cn.happy3.com;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.Statement;

public class JDBCdelete {

public static void main(String[] args) throws Exception{
// TODO Auto-generated method stub
String driver="com.microsoft.sqlserver.jdbc.SQLServerDriver";
String url="jdbc:sqlserver://localhost:1433;DatabaseName=MySchool";
String username="sa";
String pwd="1";
Class.forName(driver);
Connection con=DriverManager.getConnection(url, username, pwd);
String sql="delete from IsLogin where id=3";
Statement state=con.createStatement();
int count= state.executeUpdate(sql);
if(count>0){
System.out.println("删除成功！！");
}
state.close();
con.close();

}
}

package ls.happy.dao;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class Basedao {
public static final  String driver="com.microsoft.sqlserver.jdbc.SQLServerDriver";
public static final  String url="jdbc:sqlserver://localhost:1433;DatabaseName=subway";
public static final  String username="sa";
public static final  String pwd="1";

private Connection con;
private PreparedStatement ps;
private ResultSet rs;

//执行增删改
public int executeUpdate(String sql,Object...objs) throws Exception{
ps=con.prepareStatement(sql);
for(int i=0;i<objs.length;i++){
ps.setObject(i+1,objs[i]);
}
int count=ps.executeUpdate();
return count;
}

//读取操作
public ResultSet executeQuery(String sql,Object...objs) throws Exception{

ps=con.prepareStatement(sql);
for(int i=0;i<objs.length;i++){
ps.setObject(i+1,objs[i]);
}
rs=ps.executeQuery();
return rs;
}

//关闭连接
public void closeResoercers(){

}

static{
try{Class.forName(driver);
}
catch(Exception e){
e.printStackTrace();
}
}

public Connection getconnection() throws Exception{
try{
if(con==null||con.isClosed())
con=DriverManager.getConnection(url, username, pwd);
}catch(Exception e){
e.printStackTrace();
}
return con;
}
}