數據庫5.7-jdbc版本8.0.12驅動連接

現在版本的jdbc連接方式和原來不一樣了,

假如你使用String driver = "com.mysql.jdbc.Driver";

會拋出錯誤:

Loading class `com.mysql.jdbc.Driver'. This is deprecated. The new driver class is `com.mysql.cj.jdbc.Driver'. The driver is automatically registered via the SPI and manual loading of the driver class is generally unnecessary.

現在連接方式變了

修改方式兩種

1. String driver = "com.mysql.cj.jdbc.Driver";
2. 去除Class.forName(driver); 字段

package wu.vkcyan.jdbc;

import java.sql.*;

import org.junit.Test;

import com.mysql.cj.jdbc.Driver;
public class jdbc_1 {
	@Test
	public void Test() throws SQLException, ClassNotFoundException {
		String driver = "com.mysql.cj.jdbc.Driver";
		String URL = "jdbc:mysql://localhost/exam?useSSL=false&serverTimezone = UTC&";
		/*
		 * 所有的java.sql.Driver實現類.都被提供static快.塊類代碼就會把自己注冊了
		 * jdbc4.0后.每個jar包中,META-INF目錄下都service/java.sql.Driver文件里面內容是com.mysql.cj.jdbc.Driver,每次啟動jdbc會自動掃描,添加,所以可以不寫
		 */
			Class.forName(driver);    //注冊啟動類 ,也就是下面的代碼的反射,他里面有個靜態函數,自己就把自己注冊了
		
//			Driver driver= new Driver();
//			DriverManager.registerDriver(driver);  
			
			Connection con=DriverManager.getConnection(URL,"root","000000"); 
			System.out.println(con);
	}
}