dao
| 创建时间： | 2015/8/23 14:39 |
| 更新时间： | 2015/8/23 14:40 |
package com.text.mysql;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;
class Text{
private int id;
private String name;
private String password;
public Text(){
super();
}
public String toString() {
return "id="+id+" name="+name+" password"+password;
}
public Text (int id,String name,String password){
super();
this.id=id;
this.name=name;
this.password=password;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
}
public class Dao {
static {
try {
Class.forName("com.mysql.jdbc.Driver");
} catch (ClassNotFoundException e) {
System.out.println("加载驱动出错");
e.printStackTrace();
}
}
private Connection getConn(){
try {
return DriverManager.getConnection("jdbc:mysql://localhost:3306/sh", "root", "" );
} catch (SQLException e) {
System.out.println("数据库连接出错");
e.printStackTrace();
}
return null;
}
private void release (ResultSet rs,Statement ps,Connection conn){
if(rs!=null){
try {
rs.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
if(ps!=null){
try {
ps.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
if(conn!=null){
try {
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
public Text getUserById(int id){
ResultSet rs=null;
PreparedStatement ps=null;
Connection conn=null;
Text text=new Text();
String sql="select * from t_text where id=?";
try {
conn=this.getConn();
ps=conn.prepareStatement(sql);
ps.setInt(1, id);
rs=ps.executeQuery();
if(rs.next()){
text=new Text(rs.getInt(id),rs.getString("name"),rs.getString("password"));
System.out.println(text);
return text;
}
} catch (SQLException e) {
e.printStackTrace();
}finally{
this.release(rs, ps, conn);
}
return null;
}
public List<Text> getAllUses(){
List<Text> list =new ArrayList<Text>();
ResultSet rs=null;
PreparedStatement ps=null;
Connection conn =null;
String sql ="select * from t_text ";
try {
conn=this.getConn();
ps=conn.prepareStatement(sql);
rs=ps.executeQuery();
while (rs.next()){
Text text=new Text(rs.getInt("id"),rs.getString("name"),rs.getString("password"));
list.add(text);
}
for(Text user: list){
System.out.println(user);
}
} catch (SQLException e) {
e.printStackTrace();
}
return list;
}
public Text updateText(Text text){
int rs=0;
PreparedStatement ps=null;
Connection conn=null;
String sql="update t_text set name=?,password=? where id=?";
try {
conn=this.getConn();
conn.setAutoCommit(false);
ps=conn.prepareStatement(sql);
ps.setString(1, text.getName());
ps.setString(2, text.getPassword());
ps.setInt(3,text.getId());
rs=ps.executeUpdate();
if(rs>0){
System.out.println("upok"+rs);
conn.commit();
return text;
}
} catch (SQLException e) {
try {
conn.rollback();
} catch (SQLException e1) {
e1.printStackTrace();
}
e.printStackTrace();
}finally{
this.release(null, ps, conn);
}
return null;
}
public boolean deleteText(int id){
int rs=0;
PreparedStatement ps=null;
Connection conn=null;
String sql="delete from t_text where id=?";
try {
conn=this.getConn();
conn.setAutoCommit(false);
ps=conn.prepareStatement(sql);
ps.setInt(1,id);
rs=ps.executeUpdate();
if(rs>0){
System.out.println("deok"+rs);
conn.commit();
return true;
}
} catch (SQLException e) {
try {
conn.rollback();
} catch (SQLException e1) {
e1.printStackTrace();
}
e.printStackTrace();
}finally{
this.release(null, ps, conn);
}
return false;
}
public Text insertText(Text text){
PreparedStatement ps=null;
Connection conn=null;
String sql="insert into t_text values(?,?,?)";
try {
conn=this.getConn();
conn.setAutoCommit(false);
ps=conn.prepareStatement(sql);
ps.setInt(1,text.getId());
ps.setString(2, text.getName());
ps.setString(3, text.getPassword());
int rs=ps.executeUpdate();
conn.commit();
if(rs>0){
System.out.println("inok"+rs);
return new Text(text.getId(),text.getName(),text.getPassword());
}
} catch (SQLException e) {
try {
conn.rollback();
} catch (SQLException e1) {
e1.printStackTrace();
}
e.printStackTrace();
}finally{
this.release(null, ps, conn);
}
return null;
}
public static void main(String[] args) {
Dao dao=new Dao();
Text text=new Text(3,"ddd","444");
// text.setId(2);
// text.setName("bbb");
// text.setPassword("222");
//dao.insertText(text);
// dao.getUserById(3);
// dao.getAllUses();
dao.deleteText(4);
dao.updateText(text);
}
}