JDBC连接步骤

JDBC连接数据库的快速入门

快速入门步骤：

1.导入包
2.注册驱动
3.创建连接对象 Connection
4.定义sql
5.创建执行sql对象 Statement
6.执行sql
7.处理结果
8.释放资源

package Test;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Statement;

public class JdbcDemo {

    public static void main(String[] args) {
        //提升作用域
        Connection conn = null;
        Statement stmt = null;
        try {
            //1.导入包
            //2.注册驱动
            Class.forName("com.mysql.jdbc.Driver");
            //3.创建连接对象 Connection
            conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/库名","数据库用户名","数据库密码");
            //4.定义sql
            String sql = "insert into user values(null,'小吕',1515)";
            //5.创建执行sql对象 Statement
            stmt = conn.createStatement();
            //6.执行sql
            int count = stmt.executeUpdate(sql);
            //7.处理结果
            System.out.println(count);
        } catch (Exception e) {
            e.printStackTrace();
        }finally {
            //8.释放资源
            try {
                //防止空指针异常
                if(stmt != null){
                    stmt.close();
                }
            } catch (SQLException e) {
                e.printStackTrace();
            }
            //两个都要释放掉
            try {
                if(conn != null){
                    conn.close();
                }
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }
}

实现的效果