Java通过JDBC连接SQL Server

package Test;

import java.sql.*;

public class Test {

public static void main(String[] args) {
    update();
     
}


public static void update() {
    Connection connection=null;
    String driverName="com.microsoft.sqlserver.jdbc.SQLServerDriver";//SQL数据库引擎
    String dbURL="jdbc:sqlserver://localhost:1433;DatabaseName=tjl";//数据源  ！！！注意若出现加载或者连接数据库失败一般是这里出现问题
    String Name="sa";
    String Pwd="19990713";
  try{
  Class.forName(driverName);
  connection=DriverManager.getConnection(dbURL,Name,Pwd);
  System.out.println("连接数据库成功");
  }catch(Exception e){
   e.printStackTrace();
     System.out.println("连接失败");
     }
    Statement stmt = null;
    try {
        stmt = connection.createStatement();
    } catch (SQLException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    //增删改操作
    String sql_1="insert into student values(‘990403‘,‘佩奇‘,‘男‘,‘12‘,‘1‘,‘2101‘)";
    int count_1 = 0;
    try {
        count_1 = stmt.executeUpdate(sql_1);
    } catch (SQLException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }//返回值表示增删改几条数据
    //处理结果
    if(count_1>0){
        System.out.println("更新成功!");
    }
    //查询操作
    String sql_2="select * from student";

    //关闭
    try {
        stmt.close();
    } catch (SQLException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    try {
        connection.close();
    } catch (SQLException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
}
}