diff --git "a/06 \351\231\210\345\277\227\344\274\237/20230526 \347\275\221\351\241\265\345\242\236\345\210\240\346\237\245.md" "b/06 \351\231\210\345\277\227\344\274\237/20230526 \347\275\221\351\241\265\345\242\236\345\210\240\346\237\245.md"
new file mode 100644
index 0000000000000000000000000000000000000000..b0483a1098fcced7b61f048f5a24c5143e83cec2
--- /dev/null
+++ "b/06 \351\231\210\345\277\227\344\274\237/20230526 \347\275\221\351\241\265\345\242\236\345\210\240\346\237\245.md"
@@ -0,0 +1,225 @@
+## 增
+
+```java
+import javax.servlet.ServletException;
+import javax.servlet.annotation.WebServlet;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import java.io.IOException;
+@WebServlet("/insert")
+public class Inser extends HttpServlet {
+ @Override
+ protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+ req.setCharacterEncoding("utf-8");
+ resp.setContentType("text/html;charset=utf-8");
+ String sql = "insert into biao values (?,?,?)";
+ String id = req.getParameter("id");
+ String name = req.getParameter("name");
+ String sex = req.getParameter("sex");
+ int i = Student.Upd(sql, id, name, sex);
+ if (i>0){
+ resp.getWriter().write("添加成功");
+ }else {
+ resp.getWriter().write("添加失败");
+ }
+ }
+
+ @Override
+ protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+ doGet(req,resp);
+ }
+}
+```
+
+```java
+
+
+
+
+ Title
+
+
+添加学生
+
+
+
+```
+
+## 删
+
+```java
+import javax.servlet.*;
+import javax.servlet.http.*;
+import javax.servlet.annotation.*;
+import java.io.IOException;
+import java.io.PrintWriter;
+
+@WebServlet("/del")
+public class DeleteServlet extends HttpServlet {
+ @Override
+ protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+ response.setContentType("text/html;charset=utf-8");
+ String id = request.getParameter("id");
+ String sql = "delete from biao where id = ?";
+ int i = Student.Upd(sql, id);
+ PrintWriter out = response.getWriter();
+ if (i>0){
+ out.write("完美");
+ }else {
+ out.write("完蛋");
+ }
+ }
+
+ @Override
+ protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+ doGet(request,response);
+ }
+}
+
+```
+
+```java
+
+
+
+
+ Title
+
+
+删除学生
+
+
+
+```
+
+## 查
+
+```java
+import javax.servlet.*;
+import javax.servlet.http.*;
+import javax.servlet.annotation.*;
+import java.io.IOException;
+import java.io.PrintWriter;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+
+@WebServlet("/sel")
+public class SelectServlet extends HttpServlet {
+ @Override
+ protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+ response.setContentType("text/html;charset=utf-8");
+ request.setCharacterEncoding("utf-8");
+ String name = request.getParameter("name");
+ String sql = "select * from biao where id = ? or name like ? ";
+ PrintWriter out = response.getWriter();
+ ResultSet re = Student.Sele(sql,name,"%"+name+"%");
+ try {
+ while (re.next()){
+ int id = re.getInt(1);
+ String names = re.getString(2);
+ String sex = re.getString(3);
+ out.write(id+names+sex);
+ }
+ } catch (SQLException throwables) {
+ throwables.printStackTrace();
+ }
+
+ }
+
+ @Override
+ protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+ doGet(request,response);
+ }
+}
+
+```
+
+```java
+
+
+
+
+ Title
+
+
+查询
+
+
+
+```
+
+## sql判断运行
+
+```java
+import java.sql.*;
+
+public class Student {
+ private static final String url = "jdbc:mysql:///user?useSSL=false&useUnicode=true&characterEncoding=utf8";
+ private static final String use = "root";
+ private static final String password = "root";
+
+ static {
+ try {
+ Class.forName("com.mysql.jdbc.Driver");
+ } catch (ClassNotFoundException e) {
+ System.out.println("驱动注册失败");
+ }
+ }
+
+ public static Connection Getconn() {
+ Connection conn = null;
+ try {
+ conn = DriverManager.getConnection(url, use, password);
+ } catch (SQLException throwables) {
+ System.out.println("导包失败");
+ }
+ return conn;
+ }
+
+ public static ResultSet Sele(String sql, String ...key) {
+ ResultSet res = null;
+ try {
+ Connection conn = Getconn();
+ PreparedStatement pre = conn.prepareStatement(sql);
+ for (int i = 0; i < key.length; i++) {
+ pre.setString((i + 1), key[i]);
+ }
+ res = pre.executeQuery();
+ } catch (SQLException throwables) {
+ System.out.println("sql输入错误");
+ throwables.printStackTrace();
+ }
+ return res;
+ }
+ public static int Upd(String sql,String ...key) {
+ int num = 0;
+ try {
+ Connection conn = Getconn();
+ PreparedStatement pre = conn.prepareStatement(sql);
+ for (int i = 0; i < key.length; i++) {
+ pre.setString((i + 1), key[i]);
+ }
+ num = pre.executeUpdate();
+ } catch (SQLException throwables) {
+ System.out.println("sql输入错误");
+ throwables.printStackTrace();
+ }
+ return num;
+ }
+}
+
+```
+