JDBC链接数据库

//JDBC链接数据库“添加数据”
import java.sql.Driver;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Connection;
import java.sql.Statement;

public class JDBCTest01{
public static void main(String[] args){
Statement stmt = null;
Connection conn = null;
try{
//1.注册驱动
//DriverManager.registerDriver(new com.mysql.jdbc.Driver);
Driver driver = new com.mysql.jdbc.Driver(); //多态，父类型引用指向子类型对象
DriverManager.registerDriver(driver);
//2.获取连接
String url = “jdbc:mysql://localhost:3306/project”;
String user = “root”;
String password = “333”;
conn = DriverManager.getConnection(url,user,password);
System.out.println("数据库连接对象 = " + conn);

		//3.获取数据库操作对象
		 stmt = conn.createStatement();

		//4.执行sql
		String sql = "insert into product(number,id,name,ic,role,sector,situation) values(14,0000,'xiaoming',1111,'普通员工','生产部','异常')";
		
		//专门执行DML语句的（inset delete update）
		//返回值是影响数据库中的记录条数
		int count = stmt.executeUpdate(sql);
		System.out.println(count == 1 ? "保存成功" : "保存失败");

		//5.处理查询结果集
		
	}catch(SQLException e){
		e.printStackTrace();
	}finally{
		//6.释放资源
		//为了保证资源一定释放，在finally 语句块中关闭资源
		//并且要遵循从小到大一次关闭
		//分别对其try ...catch
		try{
			if(stmt != null){
				stmt.close();
			}
		}catch(SQLException e){
			e.printStackTrace();
		}
		try{
			if(conn != null){
				conn.close();
			}
		}catch(SQLException e){
			e.printStackTrace();
		}

	}
}

}

==================================
//JDBC链接数据库“删除数据”
import java.sql.Driver;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Connection;
import java.sql.Statement;

public class JDBCTest02{
public static void main(String[] args){
Statement stmt = null;
Connection conn = null;
try{
//1.注册驱动
DriverManager.registerDriver(new com.mysql.jdbc.Driver());
//2.获取连接
// String url = “jdbc:mysql://localhost:3306/project”;
// String user = “root”;
// String password = “333”;
// conn = DriverManager.getConnection(url,user,password);
// System.out.println("数据库连接对象 = " + conn);
conn = DriverManager.getConnection(“jdbc:mysql://localhost:3306/project”,“root”,“333”);

		//3.获取数据库操作对象
		 stmt = conn.createStatement();

		//4.执行sql
		String sql = "delete from product where number = 14";
		
		//专门执行DML语句的（inset delete update）
		//返回值是影响数据库中的记录条数
		int count = stmt.executeUpdate(sql);
		System.out.println(count == 1 ? "删除成功" : "删除失败");

		//5.处理查询结果集
		
	}catch(SQLException e){
		e.printStackTrace();
	}finally{
		//6.释放资源
		//为了保证资源一定释放，在finally 语句块中关闭资源
		//并且要遵循从小到大一次关闭
		//分别对其try ...catch
		try{
			if(stmt != null){
				stmt.close();
			}
		}catch(SQLException e){
			e.printStackTrace();
		}
		try{
			if(conn != null){
				conn.close();
			}
		}catch(SQLException e){
			e.printStackTrace();
		}

	}
}

}