每日日报2020 11/22

数据库链接

package util;

//数据库连接
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class DBUtil {

public static String db_url = "jdbc:mysql://localhost:3306/course?serverTimezone=UTC";
public static String db_user = "root";
public static String db_pass = "songzhenxing";

public static Connection getConn () {
Connection conn = null;

try {
Class.forName("com.mysql.cj.jdbc.Driver");//加载驱动
conn = DriverManager.getConnection(db_url, db_user, db_pass);//通过输入的用户名还有密码来建立一个到数据库的连接主要是调用connect（）方法
} catch (Exception e) {
e.printStackTrace();
}

return conn;
}


public static void close (Statement state, Connection conn) {
if (state != null) {
try {
state.close();
} catch (SQLException e) {
e.printStackTrace();
}
}

if (conn != null) {
try {
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}

public static void close (ResultSet rs, Statement state, Connection conn) {
if (rs != null) {
try {
rs.close();
} catch (SQLException e) {
e.printStackTrace();
}
}

if (state != null) {
try {
state.close();
} catch (SQLException e) {
e.printStackTrace();
}
}

if (conn != null) {
try {
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}

}