甲骨文和MYSQL数据库在java中的连接

最新推荐文章于 2023-09-11 08:55:22 发布

原创最新推荐文章于 2023-09-11 08:55:22 发布 · 483 阅读

CC 4.0 BY-SA版权

本文介绍了如何在Java中使用properties配置文件连接Oracle和MySQL数据库。分别展示了OracleUtil和DBUtil类，这两个类加载配置文件获取连接信息，并通过DriverManager.getConnection()方法建立连接。同时提供了关闭ResultSet、PreparedStatement和Connection的通用方法。

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oracle.properties

oracle.driver=oracle.jdbc.driver.OracleDriver

oracle.url=jdbc:oracle:thin:@localhost:1521:xe
oracle.username=scott

oracle.password=a

链接代码

package utils;

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

public class OracleUtil {

private static String driver = "" ;
private static String url = "" ;
private static String username = "" ;
private static String password = "" ;

static {
Properties pp = new Properties();
try {
pp.load(OracleUtil.class.getClassLoader().getResourceAsStream("oracle.properties"));
driver = pp.getProperty("oracle.driver");
url = pp.getProperty("oracle.url");
username = pp.getProperty("oracle.username");
password = pp.getProperty("oracle.password");
Class.forName(driver);
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}

}

public static Connection getConnection (){
Connection conn = null ;
try {
conn = DriverManager.getConnection(url, username, password);
} catch (SQLException e) {
e.printStackTrace();
}
return conn ;
}

public static void close(ResultSet rs , PreparedStatement ps , Connection conn){
try {
if(rs!=null /*&& !rs.isClosed()*/){
rs.close();
}
if(ps!=null/* && !ps.isClosed()*/){
ps.close();
}
if(conn!=null /*&& !conn.isClosed()*/){
conn.close();
}
} catch (SQLException e) {
e.printStackTrace();
}
}

//public static void main(String[] args) {
//System.out.println(OracleUtil.getConnection());
//}

}

MYSQL

package com.admin.utils;

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

public class DBUtil {

private static String driver = "" ;
private static String url = "" ;
private static String username = "" ;
private static String password = "" ;

static {
Properties pp = new Properties();
try {
pp.load(DBUtil.class.getClassLoader().getResourceAsStream("mysql.properties"));
driver = pp.getProperty("mysql.driver");
url = pp.getProperty("mysql.url");
username = pp.getProperty("mysql.username");
password = pp.getProperty("mysql.password");
Class.forName(driver);
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}

}

public static Connection getConnection (){
Connection conn = null ;
try {
conn = DriverManager.getConnection(url, username, password);
} catch (SQLException e) {
e.printStackTrace();
}
return conn ;
}

public static void close(ResultSet rs , PreparedStatement ps , Connection conn){
try {
if(rs!=null /*&& !rs.isClosed()*/){
rs.close();
}
if(ps!=null/* && !ps.isClosed()*/){
ps.close();
}
if(conn!=null /*&& !conn.isClosed()*/){
conn.close();
}
} catch (SQLException e) {
e.printStackTrace();
}
}

public static void main(String[] args) {
System.out.println(DBUtil.getConnection());
}

}