From f308781f17625ebb21f056377926657c61f8e911 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=E9=92=9F=E5=87=A4=E8=8B=B1?= <166727657@qq.com> Date: Mon, 12 Jun 2023 22:21:10 +0800 Subject: [PATCH] =?UTF-8?q?37=20=E9=92=9F=E5=87=A4=E8=8B=B1=E7=9A=84?= =?UTF-8?q?=E4=BD=9C=E4=B8=9A?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- ...77\345\261\213\347\256\241\347\220\206.md" | 356 ++++++++++++++++++ 1 file changed, 356 insertions(+) create mode 100644 "\351\222\237\345\207\244\350\213\261\347\232\204\344\275\234\344\270\232/20230610 \346\210\277\345\261\213\347\256\241\347\220\206.md" diff --git "a/\351\222\237\345\207\244\350\213\261\347\232\204\344\275\234\344\270\232/20230610 \346\210\277\345\261\213\347\256\241\347\220\206.md" "b/\351\222\237\345\207\244\350\213\261\347\232\204\344\275\234\344\270\232/20230610 \346\210\277\345\261\213\347\256\241\347\220\206.md" new file mode 100644 index 0000000..9cf719d --- /dev/null +++ "b/\351\222\237\345\207\244\350\213\261\347\232\204\344\275\234\344\270\232/20230610 \346\210\277\345\261\213\347\256\241\347\220\206.md" @@ -0,0 +1,356 @@ +## Mysql + +```mysql +# 数据库名称：test +create database test charset utf8; +use test; +# 表：house_type (房屋类型表) +create table house_type +( + id int primary key auto_increment, # 编号主键,自动增长列 + type varchar(50) not null # 房屋类型 不允许为空 +); +insert into house_type values + (0,'3室1厅'), + (0,'3室2厅'), + (0,'2室1厅'), + (0,'2室2厅'); +# 表：house_info (房源信息表) +create table house_info +( + id int primary key auto_increment, # 编号主键,自动增长列 + lease_mode varchar(50), # 租赁方式可以为空 + rent double not null, # 租金不允许为空 + contacts varchar(20), # 联系人可以为空 + deposit_method varchar(20), # 押金方式可以为空 + house_type_id int, # 房屋类型外键 + address varchar(200) not null, # 详细地址不允许为空 + foreign key (house_type_id) references house_type (id) +); + +insert into house_info values + (0,'整租',2230,'王晓明','押一付三',1,'泉州柳城区1号'), + (0,'整租',2180,'王晓明','押一付三',4,'龙岩新罗区2号'), + (0,'合租',1120,'张小飞','押一付一',2,'泉州柳城区3号'), + (0,'整租',2280,'王晓明','押一付二',3,'泉州柳城区2号'), + (0,'合租',1200,'张小飞','押一付一',2,'泉州鲤城区1号'); +``` + + + +## bean + +```java +package bean; + +public class HouseInfo { + int id; + String mode; + double rent; + String contacts; + String method; + int typeID; + String address; + String typeName; + + public HouseInfo() { + } + + public HouseInfo(int id, String mode, double rent, String contacts, String method, int typeID, String address, String typeName) { + this.id = id; + this.mode = mode; + this.rent = rent; + this.contacts = contacts; + this.method = method; + this.typeID = typeID; + this.address = address; + this.typeName = typeName; + } + + public int getId() { + return id; + } + + public void setId(int id) { + this.id = id; + } + + public String getMode() { + return mode; + } + + public void setMode(String mode) { + this.mode = mode; + } + + public double getRent() { + return rent; + } + + public void setRent(double rent) { + this.rent = rent; + } + + public String getContacts() { + return contacts; + } + + public void setContacts(String contacts) { + this.contacts = contacts; + } + + public String getMethod() { + return method; + } + + public void setMethod(String method) { + this.method = method; + } + + public int getTypeID() { + return typeID; + } + + public void setTypeID(int typeID) { + this.typeID = typeID; + } + + public String getAddress() { + return address; + } + + public void setAddress(String address) { + this.address = address; + } + + public String getTypeName() { + return typeName; + } + + public void setTypeName(String typeName) { + this.typeName = typeName; + } + + @Override + public String toString() { + return "HouseInfo{" + + "id=" + id + + ", mode='" + mode + '\'' + + ", rent=" + rent + + ", contacts='" + contacts + '\'' + + ", method='" + method + '\'' + + ", typeID=" + typeID + + ", address='" + address + '\'' + + ", typeName='" + typeName + '\'' + + '}'; + } +} + +package bean; + +public class HouseType { + int id; + String type; + + public HouseType() { + } + + public HouseType(int id, String type) { + this.id = id; + this.type = type; + } + + public int getId() { + return id; + } + + public void setId(int id) { + this.id = id; + } + + public String getType() { + return type; + } + + public void setType(String type) { + this.type = type; + } + + @Override + public String toString() { + return "HouseType{" + + "id=" + id + + ", type='" + type + '\'' + + '}'; + } +} + +``` + +## servlet + +```java +package servlet; + +import bean.HouseInfo; +import bean.HouseType; +import utils.DBUtil; + +import javax.servlet.*; +import javax.servlet.http.*; +import javax.servlet.annotation.*; +import java.io.IOException; +import java.sql.ResultSet; +import java.sql.SQLException; +import java.util.ArrayList; + +@WebServlet("/add") +public class AddServlet extends HttpServlet { + @Override + protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { + String sql="select * from house_type"; + ResultSet rs = DBUtil.query(sql); + ArrayList list = new ArrayList<>(); + try { + while (rs.next()){ + int id = rs.getInt("id"); + String type = rs.getString("type"); + HouseType houseType = new HouseType(id, type); + list.add(houseType); + } + } catch (SQLException e) { + throw new RuntimeException(e); + } + request.setAttribute("list",list); + request.getRequestDispatcher("/WEB-INF/add.jsp").forward(request,response) + ; + } + + @Override + protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { + request.setCharacterEncoding("utf-8"); + String mode = request.getParameter("mode"); + String rent = request.getParameter("rent"); + String contacts = request.getParameter("contacts"); + String method = request.getParameter("method"); + String typeID = request.getParameter("typeID"); + String address = request.getParameter("address"); + String sql="insert into house_info values(?,?,?,?,?,?,?)"; + int i = DBUtil.update(sql,null,mode,rent,contacts,method,typeID,address); + if (i>0){ + response.sendRedirect("/list"); + }else { + request.setAttribute("msg","添加失败"); + request.getRequestDispatcher("/WEB-INF/msg.jsp").forward(request,response); + } + + } +} +package servlet; + +import bean.HouseInfo; +import utils.DBUtil; + +import javax.servlet.*; +import javax.servlet.http.*; +import javax.servlet.annotation.*; +import java.io.IOException; +import java.sql.ResultSet; +import java.sql.SQLException; +import java.util.ArrayList; + +@WebServlet("/list") +public class ListServlet extends HttpServlet { + @Override + protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { + String sql="select * from house_type t,house_info i where t.id=i.house_type_id"; + ResultSet rs = DBUtil.query(sql); + ArrayList list = new ArrayList<>(); + try { + while (rs.next()){ + int id = rs.getInt("i.id"); + String mode = rs.getString("lease_mode"); + double rent = rs.getDouble("rent"); + String contacts = rs.getString("contacts"); + String method = rs.getString("deposit_method"); + int typeId = rs.getInt("house_type_id"); + String address = rs.getString("address"); + String typeName = rs.getString("type"); + HouseInfo info = new HouseInfo(id, mode, rent, contacts, method, typeId, address, typeName); + list.add(info); + } + } catch (SQLException e) { + throw new RuntimeException(e); + } + request.setAttribute("list",list); + request.getRequestDispatcher("/WEB-INF/list.jsp").forward(request,response) + ; + } + + @Override + protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { + + } +} + +``` + +## util + +```java +package utils; + +import java.sql.*; + +public class DBUtil { + private static final String url="jdbc:mysql:///test?useSSL=false&useUnicode=true&characterEncoding=utf8"; + private static final String user="root"; + private static final String pwd="root"; + static { + try { + Class.forName("com.mysql.jdbc.Driver"); + } catch (ClassNotFoundException e) { + throw new RuntimeException(e); + } + } + public static Connection getConn(){ + Connection conn = null; + try { + conn = DriverManager.getConnection(url, user, pwd); + } catch (SQLException e) { + throw new RuntimeException(e); + } + return conn; + } + public static ResultSet query(String sql,Object ...keys){ + Connection conn = getConn(); + ResultSet rs=null; + try { + PreparedStatement pst = conn.prepareStatement(sql); + for (int i = 0; i < keys.length; i++) { + pst.setObject((i+1),keys[i]); + } + rs = pst.executeQuery(); + } catch (SQLException e) { + throw new RuntimeException(e); + } + return rs; + } + public static int update(String sql,Object ...keys){ + Connection conn = getConn(); + int num=0; + try { + PreparedStatement pst = conn.prepareStatement(sql); + for (int i = 0; i < keys.length; i++) { + pst.setObject((i+1),keys[i]); + } + num = pst.executeUpdate(); + } catch (SQLException e) { + throw new RuntimeException(e); + } + return num; + } +} + +``` + -- Gitee