diff --git "a/18 \350\260\242\345\256\270/20230611 \345\221\230\345\267\245\347\256\241\347\220\206.md" "b/18 \350\260\242\345\256\270/20230611 \345\221\230\345\267\245\347\256\241\347\220\206.md" new file mode 100644 index 0000000000000000000000000000000000000000..17b09c98bc3d3a7a9d27d87e443c4b85bec28624 --- /dev/null +++ "b/18 \350\260\242\345\256\270/20230611 \345\221\230\345\267\245\347\256\241\347\220\206.md" @@ -0,0 +1,382 @@ +# 数据库CompanyManager + +```mysql +# 数据库名称：CompanyManager +create database CompanyManager character set utf8; +use CompanyManager; +# 表： Dept (部门信息表) +# 字段显示 字段名 数据类型 默认值 备注和说明 +create table Dept +( + DeptID int primary key auto_increment, # 部门编号主键,自动增长列 + DeptName varchar(20) not null # 部门名称 不允许为空 +); +# 表：Emp (员工信息表) +# 字段显示 字段名 数据类型 默认值 备注和说明 +create table Emp +( + EmpID int primary key auto_increment, # 员工编号主键,自动增长列 + EmpName varchar(20) not null, # 员工姓名 不允许为空 + Sex char(2) not null, # 性别 不允许为空 + Age int not null,# 员工年龄 不允许为空 + Tel varchar(20) not null unique, # 联系电话不允许为空（唯一约束） + PassWord varchar(12) not null,# 密码 不允许为空 + DeptID int, # 部门编号 外键，关联部门表DeptID字段 + foreign key (DeptID) references Dept (DeptID) +); +insert into Dept +values (null, '开发部'), + (null, '后勤部'), + (null, '测试部'); +insert into Emp +values (null, '张三', '女', 18, '10086', '123456', 1), + (null, '李四', '男', 24, '10087', '123456', 2), + (null, '王五', '男', 28, '10088', '123456', 3); + +``` + +# bean包 + +## Dept + +```java +package bean; + +public class Dept { + private int deptId; + private String deptName; + + public Dept() { + } + + @Override + public String toString() { + return "Dept{" + + "deptId=" + deptId + + ", deptName='" + deptName + '\'' + + '}'; + } + + public int getDeptId() { + return deptId; + } + + public void setDeptId(int deptId) { + this.deptId = deptId; + } + + public String getDeptName() { + return deptName; + } + + public void setDeptName(String deptName) { + this.deptName = deptName; + } + + public Dept(int deptId, String deptName) { + this.deptId = deptId; + this.deptName = deptName; + } +} + +``` + +## Emp + +```java +package bean; + +public class Emp { + private int empId; + private String empName; + private String sex; + private int age; + private String tel; + private String passWord; + private int deptId; + private String deptName; + + @Override + public String toString() { + return "Emp{" + + "empId=" + empId + + ", empName='" + empName + '\'' + + ", sex='" + sex + '\'' + + ", age=" + age + + ", tel='" + tel + '\'' + + ", passWord='" + passWord + '\'' + + ", deptId=" + deptId + + ", deptName='" + deptName + '\'' + + '}'; + } + + public int getEmpId() { + return empId; + } + + public void setEmpId(int empId) { + this.empId = empId; + } + + public String getEmpName() { + return empName; + } + + public void setEmpName(String empName) { + this.empName = empName; + } + + public String getSex() { + return sex; + } + + public void setSex(String sex) { + this.sex = sex; + } + + public int getAge() { + return age; + } + + public void setAge(int age) { + this.age = age; + } + + public String getTel() { + return tel; + } + + public void setTel(String tel) { + this.tel = tel; + } + + public String getPassWord() { + return passWord; + } + + public void setPassWord(String passWord) { + this.passWord = passWord; + } + + public int getDeptId() { + return deptId; + } + + public void setDeptId(int deptId) { + this.deptId = deptId; + } + + public String getDeptName() { + return deptName; + } + + public void setDeptName(String deptName) { + this.deptName = deptName; + } + + public Emp(int empId, String empName, String sex, int age, String tel, String passWord, int deptId, String deptName) { + this.empId = empId; + this.empName = empName; + this.sex = sex; + this.age = age; + this.tel = tel; + this.passWord = passWord; + this.deptId = deptId; + this.deptName = deptName; + } + + public Emp() { + } +} + +``` + +# Servlet + +```java +package servlet; + +import bean.Emp; +import util.DBUtil; + +import javax.servlet.*; +import javax.servlet.http.*; +import javax.servlet.annotation.*; +import java.io.IOException; +import java.sql.Connection; +import java.sql.PreparedStatement; +import java.sql.ResultSet; +import java.sql.SQLException; +import java.util.ArrayList; + +@WebServlet("/list") +public class ServletList extends HttpServlet { + @Override + protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { + String sql = "select * from Dept d,Emp e where d.DeptID= e.DeptID"; + ResultSet rs = DBUtil.query(sql); + ArrayList list = new ArrayList<>(); + try { + while (rs.next()) { + int empId = rs.getInt("empid"); + String empName = rs.getString("empname"); + String sex = rs.getString("sex"); + int age = rs.getInt("age"); + String tel = rs.getString("tel"); + String passWord = rs.getString("password"); + int deptId = rs.getInt("deptid"); + String deptName = rs.getString("deptname"); + Emp emp = new Emp(empId, empName, sex, age, tel, passWord, deptId, deptName); + list.add(emp); + } + } catch (SQLException e) { + e.printStackTrace(); + } + request.setAttribute("list", list); + request.getRequestDispatcher("/WEB-INF/list.jsp").forward(request,response); + } + + @Override + protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { + request.setCharacterEncoding("utf-8"); + String user = request.getParameter("user"); + String sql = "select * from Dept d,Emp e where d.DeptID= e.DeptID and empName like ?"; + ResultSet rs = DBUtil.query(sql,"%"+user+"%"); + ArrayList list = new ArrayList<>(); + try { + while (rs.next()) { + int empId = rs.getInt("empid"); + String empName = rs.getString("empname"); + String sex = rs.getString("sex"); + int age = rs.getInt("age"); + String tel = rs.getString("tel"); + String passWord = rs.getString("password"); + int deptId = rs.getInt("deptid"); + String deptName = rs.getString("deptname"); + Emp emp = new Emp(empId, empName, sex, age, tel, passWord, deptId, deptName); + list.add(emp); + } + } catch (SQLException e) { + e.printStackTrace(); + } + request.setAttribute("list", list); + request.getRequestDispatcher("/WEB-INF/list.jsp").forward(request,response); + } +} + +``` + +DBUtil + +```java +package util; + +import java.sql.*; + +public class DBUtil { + static String url="jdbc:mysql:///CompanyManager?characterEncoding=utf8"; + static String use = "root"; + static String pwd = "root"; + static { + try { + Class.forName("com.mysql.jdbc.Driver"); + } catch (ClassNotFoundException e) { + e.printStackTrace(); + } + } + public static Connection getconn() throws SQLException { + Connection conn = DriverManager.getConnection(url, use, pwd); + return conn; + } + public static ResultSet query(String sql,Object...keys){ + ResultSet rs = null; + try { + Connection conn = getconn(); + PreparedStatement pst = conn.prepareStatement(sql); + rs = null; + for (int i = 0; i < keys.length; i++) { + pst.setObject((i+1),keys[i]); + } + rs= pst.executeQuery(); + } catch (SQLException e) { + e.printStackTrace(); + } + return rs; + } + public static int update(String sql,Object...keys){ + int rs = 0; + try { + Connection conn = getconn(); + PreparedStatement pst = conn.prepareStatement(sql); + rs = 0; + for (int i = 0; i < keys.length; i++) { + pst.setObject((i+1),keys[i]); + } + rs= pst.executeUpdate(); + } catch (SQLException e) { + e.printStackTrace(); + } + return rs; + } + public static void close(ResultSet rs,PreparedStatement pst,Connection conn) throws SQLException { + if (rs!=null){ + rs.close(); + } + if (pst!=null){ + pst.close(); + } + if (conn!=null){ + conn.close(); + } + } +} + +``` + +# JSP + +```javascript +<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %> +<%-- + Created by IntelliJ IDEA. + User: Administrator + Date: 2023-06-10 + Time: 16:16 + To change this template use File | Settings | File Templates. +--%> +<%@ page contentType="text/html;charset=UTF-8" language="java" %> + + + 员工列表 + + +
+ 姓名： +
+<%--b) 在列表中，需要显示列“编号”、“姓名”、“性别”、“年龄”、“电话”、“所属部门”；--%> + + + + + + + + + + + + + + + + + + + +
编号姓名性别年龄电话所属部门
${Emp.empId}${Emp.empName}${Emp.sex}${Emp.age}${Emp.tel}${Emp.deptName}
+ + + +``` + +