SSM整合BaseDao工具类

Bertha 。 2024-04-01 17:38 38阅读 0赞

突然心血来潮，想找一个BaseDao工具类，找半天找不到，就自己写了一个，方便后续使用。

package com.zzw.wxmall.dao;
    
    import java.sql.*;
    
    /**
     * @author zzw
     * @description TODO
     * @date 2022-11-11 15:18
     */
    public class BaseDao {
        
    
        private final String DRIVER="com.mysql.cj.jdbc.Driver"; // mysql
    //    private final String DRIVER="com.microsoft.sqlserver.jdbc.SQLServerDriver"; // SqlServer
        private final String URL= "jdbc:mysql://localhost:3306/数据库名?useUnicode=true&characterEncoding=UTF-8&serverTimezone=Asia/Shanghai"; // mysql
    //    private final String URL= "jdbc:sqlserver://localhost:1433;databaseName=数据库名"; // SqlServer
        private final String USERNAME = "root"; // 用户名
        private final String PWD = "root"; // 密码
    
    
    
        private Connection connection;
        private PreparedStatement ps;
        protected ResultSet rs;
    
        /**
         * 打开连接
         */
        public void getConnection(){
        
            try {
        
                Class.forName(DRIVER);
                // 2在网络中查找数据库，创建连接对象
                connection = DriverManager.getConnection(
                        URL, USERNAME,PWD);
            } catch (ClassNotFoundException e) {
        
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (SQLException e) {
        
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            //return connection;
        }
    
        /**
         * 关闭连接
         */
        public void closeAll(){
        
            try {
        
                // 释放资源（后打开的先关闭，先打开的后关闭）
                if (rs != null)
                    rs.close();
                if (ps != null)
                    ps.close();
                if (connection != null)
                    connection.close();
            } catch (SQLException e) {
        
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
    
        }
    
        /**
         * 查询
         * @param sql
         * @param params
         */
        public void executeQuery(String sql , Object... params){
        
            try {
        
                getConnection();
                ps = connection.prepareStatement(sql);
                if(params!= null){
        
                    for (int i = 0; i < params.length; i++) {
        
                        ps.setObject(i+1, params[i]);
                    }
                }
                rs = ps.executeQuery();
            } catch (SQLException e) {
        
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    
    
        /**
         * 增、删、改
         * @param sql
         * @param params
         * @return
         */
        public int executeUpdate(String sql , Object... params){
        
            int result = -1;
            try {
        
                getConnection();
                ps = connection.prepareStatement(sql);
                if(params!= null){
        
                    for (int i = 0; i < params.length; i++) {
        
                        ps.setObject(i+1, params[i]);
                    }
                }
                result= ps.executeUpdate();
            } catch (SQLException e) {
        
                // TODO Auto-generated catch block
                e.printStackTrace();
            }finally{
        
                this.closeAll();
            }
            return result;
        }
        
    }