Java 实验四 JDBC数据库编程 My SQL

Java 实验四 JDBC数据库编程 My SQL,第1张

Java 实验四 JDBC数据库编程 My SQL 一、实验内容:

首先建立一个数据库,通过编程实现:

  1. 建立一个表,表名为职工,结构为:编号,姓名、性别、年龄、工资、职称;

2.向职工表中插入三条记录,如上表所示;并查询所有职工信息,输出到控制台。
3.将年龄在45岁以上的员工工资增加15%,其他人增加10%,存入原表中,并查询更新后的所有员工信息,输出到控制台。
4.删除工资超过1500的员工记录,并将每条记录按照工资由大到小的顺序排序显示输出到控制台。

二、实验代码:

【注】:这几部分还是分开写比较合适,获得结果更容易
(1)创建表:

package Test4;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Collection;
 
 
//202056228杨丽花


public class Test4_111 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Statement stmt=null;
		ResultSet rs=null;
		Connection conn=null;
		try {
			//1.注册数据库的驱动
			Class.forName("com.mysql.cj.jdbc.Driver");//版本为6.02之后
			//2.通过DriverManager获得数据库的连接
			String url="jdbc:mysql://localhost:3306/jdbc";
			String username="root";
			String password="root";
			conn =DriverManager.getConnection(url,username,password);
			//3.通过	Connection对象获取Statement对象
			stmt=conn.createStatement();
			//4.使用Statement执行SQL语句
			 
			 
			String create="create table users("
					+ "id int(40),"
					+ "name varchar(40), "
					+ "sex varchar(40), "
					+ "age varchar(40), "
					+ "wage varchar(40), "
					+ "work varchar(40))";
		
			
		
		//创建表
		stmt.executeLargeUpdate(create);
		 
				
		}catch(ClassNotFoundException e) {
			e.printStackTrace();
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}finally {
			//6.回收数据库资源
			
			if(stmt!=null) {
				try {
					stmt.close();
				}catch(SQLException e) {
					e.printStackTrace();
				}
				stmt=null;
			}
			if(conn!=null) {
				try {
					conn.close();
				}catch(SQLException e) {
					e.printStackTrace();
				}
				conn=null;
			}
		}
		
		
	}

	private static Object age(int i) {
		// TODO Auto-generated method stub
		return null;
	}

}

(2)插入表:

package Test4;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Collection;
 
 
//202056228杨丽花


public class Test4_222 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Statement stmt=null;
		ResultSet rs=null;
		Connection conn=null;
		try {
			//1.注册数据库的驱动
			Class.forName("com.mysql.cj.jdbc.Driver");//版本为6.02之后
			//2.通过DriverManager获得数据库的连接
			String url="jdbc:mysql://localhost:3306/jdbc";
			String username="root";
			String password="root";
			conn =DriverManager.getConnection(url,username,password);
			//3.通过	Connection对象获取Statement对象
			stmt=conn.createStatement();
			//4.使用Statement执行SQL语句
			String select="select *from users";
			 
			String create="create table users("
					+ "id int(40),"
					+ "name varchar(40), "
					+ "sex varchar(40), "
					+ "age varchar(40), "
					+ "wage varchar(40), "
					+ "work varchar(40))";
		String insert = "insert into users(id,name,sex,age,wage,work)rn"
				+ "			Values(1001,'丁卫国','男',25,2500,'助工'),rn"
				+ "			(1002,'张小华','女',30,1000,'工程师'),rn"
				+ "		(1003,'宁涛','男',50,600,'高工')";
			
		
		//创建表
		///stmt.executeLargeUpdate(create);
		//插入表	
		//stmt.executeLargeUpdate(insert);
		 
 
			rs=stmt.executeQuery(select);
			//5. *** 作ResultSet结果集
			System.out.println("id      |     name      |     sex       |    "+
					"age       |    wage       |    work      |    ");
			while(rs.next()) {
				int id=rs.getInt("id");//通过列名获得指定字段的值-编号
				String name=rs.getString("name");//姓名
				String sex=rs.getString("sex");//性别
				double wage=rs.getDouble("wage");//工资
				int age=rs.getInt("age");//年龄
				String work=rs.getString("work");//职称
				System.out.println(id+"      |     "+name+"      |     "+sex+"       |    "
					+age+"       |    "+wage+"       |    "+work+"       |    ");
			}
		}catch(ClassNotFoundException e) {
			e.printStackTrace();
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}finally {
			//6.回收数据库资源
			
			if(stmt!=null) {
				try {
					stmt.close();
				}catch(SQLException e) {
					e.printStackTrace();
				}
				stmt=null;
			}
			if(conn!=null) {
				try {
					conn.close();
				}catch(SQLException e) {
					e.printStackTrace();
				}
				conn=null;
			}
		}
		
		
	}

	private static Object age(int i) {
		// TODO Auto-generated method stub
		return null;
	}

}

(3)增加工资,修改:

package Test4;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Collection;
 
 
//202056228杨丽花


public class Test4_333 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Statement stmt=null;
		ResultSet rs=null;
		Connection conn=null;
		try {
			//1.注册数据库的驱动
			Class.forName("com.mysql.cj.jdbc.Driver");//版本为6.02之后
			//2.通过DriverManager获得数据库的连接
			String url="jdbc:mysql://localhost:3306/jdbc";
			String username="root";
			String password="root";
			conn =DriverManager.getConnection(url,username,password);
			//3.通过	Connection对象获取Statement对象
			stmt=conn.createStatement();
			//4.使用Statement执行SQL语句
			String select="select *from users";
			 
			String create="create table users("
					+ "id int(40),"
					+ "name varchar(40), "
					+ "sex varchar(40), "
					+ "age varchar(40), "
					+ "wage varchar(40), "
					+ "work varchar(40))";
		String insert = "insert into users(id,name,sex,age,wage,work)rn"
				+ "			Values(1001,'丁卫国','男',25,2500,'助工'),rn"
				+ "			(1002,'张小华','女',30,1000,'工程师'),rn"
				+ "		(1003,'宁涛','男',50,600,'高工')";
			
		
		//创建表
		stmt.executeLargeUpdate(create);
		//插入表	
		stmt.executeLargeUpdate(insert);
		//修改表
		  String update = "update users set wage = wage + wage * 0.1 where age < 45";
		  stmt.executeUpdate(update); String update1 =
		  "update users set wage = wage + wage * 0.15 where age > 45";
		  stmt.executeUpdate(update1);
		 
  
		}catch(ClassNotFoundException e) {
			e.printStackTrace();
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}finally {
			//6.回收数据库资源
			
			if(stmt!=null) {
				try {
					stmt.close();
				}catch(SQLException e) {
					e.printStackTrace();
				}
				stmt=null;
			}
			if(conn!=null) {
				try {
					conn.close();
				}catch(SQLException e) {
					e.printStackTrace();
				}
				conn=null;
			}
		}
		
		
	}

	private static Object age(int i) {
		// TODO Auto-generated method stub
		return null;
	}

}

(4)删除记录,并排序:

package Test4;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Collection;
 
 
//202056228杨丽花


public class Test4_444 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Statement stmt=null;
		ResultSet rs=null;
		Connection conn=null;
		try {
			//1.注册数据库的驱动
			Class.forName("com.mysql.cj.jdbc.Driver");//版本为6.02之后
			//2.通过DriverManager获得数据库的连接
			String url="jdbc:mysql://localhost:3306/jdbc";
			String username="root";
			String password="root";
			conn =DriverManager.getConnection(url,username,password);
			//3.通过	Connection对象获取Statement对象
			stmt=conn.createStatement();
			//4.使用Statement执行SQL语句
			String select="select *from users";
			 
			String create="create table users("
					+ "id int(40),"
					+ "name varchar(40), "
					+ "sex varchar(40), "
					+ "age varchar(40), "
					+ "wage varchar(40), "
					+ "work varchar(40))";
		String insert = "insert into users(id,name,sex,age,wage,work)rn"
				+ "			Values(1001,'丁卫国','男',25,2500,'助工'),rn"
				+ "			(1002,'张小华','女',30,1000,'工程师'),rn"
				+ "		(1003,'宁涛','男',50,600,'高工')";
			
		
		 
		String delete = "delete FROM users where wage > 1500";
		String select1 = "select * from users ORDER BY wage ASC";
		stmt.executeUpdate(delete);
			rs=stmt.executeQuery(select1);
			//5. *** 作ResultSet结果集
			System.out.println("id      |     name      |     sex       |    "+
					"age       |    wage       |    work      |    ");
			while(rs.next()) {
				int id=rs.getInt("id");//通过列名获得指定字段的值-编号
				String name=rs.getString("name");//姓名
				String sex=rs.getString("sex");//性别
				double wage=rs.getDouble("wage");//工资
				int age=rs.getInt("age");//年龄
				String work=rs.getString("work");//职称
				System.out.println(id+"      |     "+name+"      |     "+sex+"       |    "
					+age+"       |    "+wage+"       |    "+work+"       |    ");
			}
		}catch(ClassNotFoundException e) {
			e.printStackTrace();
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}finally {
			//6.回收数据库资源
			
			if(stmt!=null) {
				try {
					stmt.close();
				}catch(SQLException e) {
					e.printStackTrace();
				}
				stmt=null;
			}
			if(conn!=null) {
				try {
					conn.close();
				}catch(SQLException e) {
					e.printStackTrace();
				}
				conn=null;
			}
		}
		
		
	}

	private static Object age(int i) {
		// TODO Auto-generated method stub
		return null;
	}

}

三、运行结果:

(1)创建数据库:

(2)创建表:


(3)插入数据表:

控制台:

(4)根据条件,修改工资:

(5)删除工资超过1500的记录:

按工资从大到小排序:

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原文地址: http://outofmemory.cn/zaji/5676787.html

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