jdbc数据库连接例子

【实例简介】

jdbc数据库连接

【核心代码】

package cn.itcast.utils;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ResourceBundle;

//使用配置文件

public class JdbcUtils {

private static final String DRIVERCLASS;
private static final String URL;
private static final String USERNAME;
private static final String PASSWORD;

static {
DRIVERCLASS = ResourceBundle.getBundle("jdbc").getString("driverClass");
URL = ResourceBundle.getBundle("jdbc").getString("url");
USERNAME = ResourceBundle.getBundle("jdbc").getString("username");
PASSWORD = ResourceBundle.getBundle("jdbc").getString("password");
}

static {
try {
// 将加载驱动操作，放置在静态代码块中.这样就保证了只加载一次.
Class.forName(DRIVERCLASS);
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
}

public static Connection getConnection() throws SQLException {

// 2.获取连接
Connection con = DriverManager.getConnection(URL, USERNAME, PASSWORD);

return con;
}

//关闭操作
public static void closeConnection(Connection con) throws SQLException{
if(con!=null){
con.close();
}
}
public static void closeStatement(Statement st) throws SQLException{
if(st!=null){
st.close();
}
}
public static void closeResultSet(ResultSet rs) throws SQLException{
if(rs!=null){
rs.close();
}
}
}