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

//练习insert语句
public class JDBCdemo2 {
    public static void main(String[] args) {
        Statement statement = null;
        Connection connection = null;
        try {
            //注册驱动
            Class.forName("com.mysql.jdbc.Driver");

            //获取数据库连接对象
            connection = DriverManager.getConnection("jdbc:mysql:///db1", "root", "root");
            statement = connection.createStatement();
            String sql = "insert into Student values('司马懿','72')";
            int i = statement.executeUpdate(sql);
            if (i > 0) {
                System.out.println("插入成功");
            } else {
                System.out.println("插入失败");
            }
        } catch (ClassNotFoundException | SQLException e) {
            e.printStackTrace();
        }finally {
            if (statement != null){
                try {
                    statement.close();
                } catch (SQLException throwables) {
                    throwables.printStackTrace();
                }
            }
            if (connection != null){
                try {
                    connection.close();
                } catch (SQLException throwables) {
                    throwables.printStackTrace();
                }
            }
        }
    }
}

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

//更新语句
public class JDBCdemo3 {
    public static void main(String[] args) {
        Connection connection = null;
        Statement statement = null;
        try {
            Class.forName("com.mysql.jdbc.Driver");
            connection = DriverManager.getConnection("jdbc:mysql:///db1", "root", "root");
            statement = connection.createStatement();
            String sql = "update student set age = 38 where name = '郭奉孝'";
            statement.executeUpdate(sql);
        } catch (ClassNotFoundException | SQLException e) {
            e.printStackTrace();
        }finally {
            if (connection != null){
                try {
                    connection.close();
                } catch (SQLException throwables) {
                    throwables.printStackTrace();
                }
            }
            if (statement != null){
                try {
                    statement.close();
                } catch (SQLException throwables) {
                    throwables.printStackTrace();
                }
            }
        }
    }
}

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

//练习删除语句
public class JDBCdemo4 {
    public static void main(String[] args) {
        Connection connection = null;
        Statement statement = null;
        try {
            Class.forName("com.mysql.jdbc.Driver");
            connection = DriverManager.getConnection("jdbc:mysql:///db1", "root", "root");
            statement = connection.createStatement();
            String sql = "Delete from student where name = '司马懿'";
            statement.executeUpdate(sql);
        } catch (ClassNotFoundException | SQLException e) {
            e.printStackTrace();
        }finally {
            if (connection != null){
                try {
                    connection.close();
                } catch (SQLException throwables) {
                    throwables.printStackTrace();
                }
            }
            if (statement != null){
                try {
                    statement.close();
                } catch (SQLException throwables) {
                    throwables.printStackTrace();
                }
            }
        }
    }
}