JDBC_简单封装_资源文件properties处理连接信息

本文链接：https://blog.youkuaiyun.com/weixin_44805105/article/details/110234728

Demo类

package com.lzy.jdbc;

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

public class Demo09 {

	public static void main(String[] args) {
		Connection conn=null;
		PreparedStatement ps=null;
		ResultSet rs = null;
		try {
			conn = JDBCUtil.getMysqlConn();
			ps=conn.prepareStatement("insert into t_user(username) values(?)");
			
			ps.setString(1, "lzy");
			ps.execute();
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}finally {
			JDBCUtil.close(rs, ps, conn);
		}
		
	}
}

JDBCUtil类

package com.lzy.jdbc;

import java.io.IOException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Properties;

public class JDBCUtil {

	static Properties pros =null;//可以帮助读取和处理资源文件中的信息
	static {
		//加载JDBCUtil类的时候调用
		pros=new Properties();
		try {
			pros.load(Thread.currentThread().getContextClassLoader().getResourceAsStream("db.properties"));
			//可以不用记，直接抄就行
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

	public static Connection getMysqlConn(){
		try {
			Class.forName(pros.getProperty("mysqlDriver"));
			return DriverManager.getConnection(pros.getProperty("mysqlURL"),
					pros.getProperty("mysqlUser"),pros.getProperty("mysqlPwd"));
		} catch (Exception e) {
			e.printStackTrace();
			return null;
		}
	}
	public static Connection getOracleConn(){
		try {
			Class.forName(pros.getProperty("oracleDriver"));
			return DriverManager.getConnection(pros.getProperty("oracleURL"),
					pros.getProperty("oracleUser"),pros.getProperty("oraclePwd"));
		} catch (Exception e) {
			e.printStackTrace();
			return null;
		}
	}
	
	public static void close(ResultSet rs,Statement ps,Connection conn){
		try {
			if(rs!=null){
				rs.close();
			}
		} catch (SQLException e) {
			e.printStackTrace();
		}
		try {
			if(ps!=null){
				ps.close();
			}
		} catch (SQLException e) {
			e.printStackTrace();
		}
		try {
			if(conn!=null){
				conn.close();
			}
		} catch (SQLException e) {
			e.printStackTrace();
		}
	}
	
	public static void close(Statement ps,Connection conn){
		try {
			if(ps!=null){
				ps.close();
			}
		} catch (SQLException e) {
			e.printStackTrace();
		}
		try {
			if(conn!=null){
				conn.close();
			}
		} catch (SQLException e) {
			e.printStackTrace();
		}
	}
	public static void close(Connection conn){
		try {
			if(conn!=null){
				conn.close();
			}
		} catch (SQLException e) {
			e.printStackTrace();
		}
	}
	
	
}