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diff --git "a/34 \345\210\230\346\231\272\347\277\224/20230519 jsp\344\275\234\344\270\232.md" "b/34 \345\210\230\346\231\272\347\277\224/20230519 jsp\344\275\234\344\270\232.md"
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@@ -0,0 +1,168 @@
+```java
+reate database student_db charset utf8;
+use student_db;
+create table studetn{
+ id int,
+ name varchar(5),
+ sex varchar(2)
+ );
+ insert into student values
+ (1,'张三','男'),
+ (2,'李四','女'),
+ (3,'王五','男');
+ select * from student;
+```
+
+mysql链接增删改查
+
+```java
+import java.sql.*;
+    public class hhh {
+        private static final String url="jdbc:mysql:///test?useSSL=false&useUnicode=true&characterEncoding=utf8";
+        private static final String username="root";
+        private static final String password="root";
+        static  PreparedStatement ps=null;
+        static  Connection conn=null;
+        static  ResultSet re=null;
+        static {
+            try {
+                Class.forName("com.mysql.jdbc.Driver");
+            } catch (ClassNotFoundException e) {
+                System.out.println("驱动有问题");
+                e.printStackTrace();
+            }
+        }
+        public static Connection conn() {
+            try {
+                conn = DriverManager.getConnection(url,username,password);
+            } catch (SQLException e) {
+                System.out.println("路径，用户名，密码错误请检查");
+            }
+            return conn;
+        }
+        public static ResultSet select(String sql,String ...values){
+            conn();
+            ResultSet re = null;
+            try {
+                ps = conn().prepareStatement(sql);
+                for (int i = 0; i < values.length; i++) {
+                    ps.setObject((i+1),values[i]);
+                }
+                re=ps.executeQuery();
+            } catch (SQLException e) {
+                System.out.println("sql语句有问题");
+                e.printStackTrace();
+            }
+            return  re;
+        }
+        public static int update(String sql,String ...values){
+            conn();
+            int i=0;
+            try {
+                ps= conn().prepareStatement(sql);
+                for (int a = 0; a < values.length; a++) {
+                    ps.setObject((a+1),values[a]);
+                }
+                i=ps.executeUpdate();
+            } catch (SQLException e) {
+                System.out.println("sql语句有问题");
+                e.printStackTrace();
+            }
+            return i;
+        }
+        public static void close(){
+            try {
+                ps.close();
+                conn.close();
+                re.close();
+            } catch (SQLException e) {
+                System.out.println("无法关闭");
+                e.printStackTrace();
+            }
+        }
+    }
+```
+
+Student类
+
+```java
+public class Student {
+    int id;
+    String name;
+    String sex;
+
+    public Student() {
+    }
+
+    public Student(int id, String name, String sex) {
+        this.id = id;
+        this.name = name;
+        this.sex = sex;
+    }
+
+    public int getId() {
+        return id;
+    }
+
+    public void setId(int id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getSex() {
+        return sex;
+    }
+
+    public void setSex(String sex) {
+        this.sex = sex;
+    }
+
+    @Override
+    public String toString() {
+        return "Student{" +
+                "id=" + id +
+                ", name='" + name + '\'' +
+                ", sex='" + sex + '\'' +
+                '}';
+    }
+}
+```
+
+mian方法测试
+
+```java
+import java.sql.*;
+import java.util.ArrayList;
+
+public class test {
+    public static void main(String[] args) {
+        Connection conn=hhh.conn();
+        ArrayList<Student> list=new ArrayList<>();
+        String sql="select * from student";
+        ResultSet re=hhh.select(sql);
+        Student stu=new Student();
+        try {
+            while (re.next()){
+                int id= re.getInt(1);
+                String name=re.getString(2);
+                String sex= re.getString(3);
+                stu.setId(id);
+                stu.setName(name);
+                stu.setSex(sex);
+                list.add(stu);
+            }
+        } catch (SQLException e) {
+            System.out.println("wuy1");
+        }
+        System.out.println(list);
+
+    }
+}
+```
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