diff --git a/demo/.mvn/wrapper/maven-wrapper.jar b/demo/.mvn/wrapper/maven-wrapper.jar
new file mode 100644
index 0000000..01e6799
Binary files /dev/null and b/demo/.mvn/wrapper/maven-wrapper.jar differ
diff --git a/demo/.mvn/wrapper/maven-wrapper.properties b/demo/.mvn/wrapper/maven-wrapper.properties
new file mode 100644
index 0000000..7179346
--- /dev/null
+++ b/demo/.mvn/wrapper/maven-wrapper.properties
@@ -0,0 +1 @@
+distributionUrl=https://repo.maven.apache.org/maven2/org/apache/maven/apache-maven/3.5.4/apache-maven-3.5.4-bin.zip
diff --git a/demo/pom.xml b/demo/pom.xml
new file mode 100644
index 0000000..6132cbf
--- /dev/null
+++ b/demo/pom.xml
@@ -0,0 +1,79 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+	<modelVersion>4.0.0</modelVersion>
+	<parent>
+		<groupId>org.springframework.boot</groupId>
+		<artifactId>spring-boot-starter-parent</artifactId>
+		<version>2.1.1.RELEASE</version>
+		<relativePath/> <!-- lookup parent from repository -->
+	</parent>
+	<groupId>com.example</groupId>
+	<artifactId>demo</artifactId>
+	<version>0.0.1-SNAPSHOT</version>
+	<name>demo</name>
+	<description>Demo project for Spring Boot</description>
+
+	<properties>
+		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
+		<java.version>1.8</java.version>
+	</properties>
+
+	<dependencies>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter</artifactId>
+		</dependency>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-test</artifactId>
+			<version>1.3.2</version>
+		</dependency>
+		<dependency>
+			<groupId>org.mybatis.spring.boot</groupId>
+			<artifactId>mybatis-spring-boot-starter</artifactId>
+			<optional>true</optional><!-- 这个需要为 true 热部署才有效 -->
+		</dependency>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-data-jpa</artifactId>
+		</dependency>
+		<dependency>
+			<groupId>net.sf.json-lib</groupId>
+			<artifactId>json-lib</artifactId>
+			<version>2.4</version>
+			<classifier>jdk15</classifier>
+		</dependency>
+		<!-- mysql -->
+		<dependency>
+			<groupId>mysql</groupId>
+			<artifactId>mysql-connector-java</artifactId>
+			<version>8.0.13</version>
+		</dependency>
+		<!-- mybatis -->
+		<dependency>
+		<groupId>org.mybatis.spring.boot</groupId>
+		<artifactId>mybatis-spring-boot-starter</artifactId>
+		<version>1.1.1</version>
+	</dependency>
+
+		<!-- servlet -->
+		<dependency>
+			<groupId>javax.servlet</groupId>
+			<artifactId>javax.servlet-api</artifactId>
+			<version>3.0.1</version>
+			<scope>provided</scope>
+		</dependency>
+	</dependencies>
+
+	<build>
+		<plugins>
+			<plugin>
+				<groupId>org.springframework.boot</groupId>
+				<artifactId>spring-boot-maven-plugin</artifactId>
+			</plugin>
+		</plugins>
+	</build>
+
+</project>
diff --git a/demo/src/main/java/com/example/demo/Dao/bookMapper.java b/demo/src/main/java/com/example/demo/Dao/bookMapper.java
new file mode 100644
index 0000000..bfcdfc1
--- /dev/null
+++ b/demo/src/main/java/com/example/demo/Dao/bookMapper.java
@@ -0,0 +1,4 @@
+package com.example.demo.Dao;
+import com.example.demo.bean.book;
+public interface bookMapper {
+}
diff --git a/demo/src/main/java/com/example/demo/Dao/borrowrecordMapper.java b/demo/src/main/java/com/example/demo/Dao/borrowrecordMapper.java
new file mode 100644
index 0000000..40e42c5
--- /dev/null
+++ b/demo/src/main/java/com/example/demo/Dao/borrowrecordMapper.java
@@ -0,0 +1,7 @@
+package com.example.demo.Dao;
+
+import com.example.demo.bean.borrowrecord;
+
+public interface borrowrecordMapper {
+
+}
diff --git a/demo/src/main/java/com/example/demo/Dao/studentMapper.java b/demo/src/main/java/com/example/demo/Dao/studentMapper.java
new file mode 100644
index 0000000..8ccfb89
--- /dev/null
+++ b/demo/src/main/java/com/example/demo/Dao/studentMapper.java
@@ -0,0 +1,10 @@
+package com.example.demo.Dao;
+
+import com.example.demo.bean.student;
+import java.util.List;
+public interface studentMapper{
+    @Select("select * from student where s_id = #{s_id}")
+    public student selectAudioByS_id(long s_id);
+    @Select("select * from student")
+    public List<student> select();
+}
diff --git a/demo/src/main/java/com/example/demo/DemoApplication.java b/demo/src/main/java/com/example/demo/DemoApplication.java
new file mode 100644
index 0000000..3f3d9f6
--- /dev/null
+++ b/demo/src/main/java/com/example/demo/DemoApplication.java
@@ -0,0 +1,14 @@
+package com.example.demo;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class DemoApplication {
+
+	public static void main(String[] args) {
+		SpringApplication.run(DemoApplication.class, args);
+	}
+
+}
+
diff --git a/demo/src/main/java/com/example/demo/bean/book.java b/demo/src/main/java/com/example/demo/bean/book.java
new file mode 100644
index 0000000..bde93a3
--- /dev/null
+++ b/demo/src/main/java/com/example/demo/bean/book.java
@@ -0,0 +1,54 @@
+package com.example.demo.bean;
+
+public class book {
+    @GeneratedValue(strategy=GenerationType.AUTO)
+    @ID
+    private long book_id;
+    private string book_name;
+    private string author;
+    private string book_sort;
+    private int book_num;
+
+    public long getBook_id() {
+        return book_id;
+    }
+
+    public void setBook_id(long book_id) {
+        this.book_id = book_id;
+    }
+
+    public string getBook_name() {
+        return book_name;
+    }
+
+    public void setBook_name(string book_name) {
+        this.book_name = book_name;
+    }
+
+    public string getAuthor() {
+        return author;
+    }
+
+    public void setAuthor(string author) {
+        this.author = author;
+    }
+
+    public string getBook_sort() {
+        return book_sort;
+    }
+
+    public void setBook_sort(string book_sort) {
+        this.book_sort = book_sort;
+    }
+
+    public int getBook_num() {
+        return book_num;
+    }
+
+    public void setBook_num(int book_num) {
+        this.book_num = book_num;
+    }
+
+    public book(){};
+
+}
diff --git a/demo/src/main/java/com/example/demo/bean/borrowrecord.java b/demo/src/main/java/com/example/demo/bean/borrowrecord.java
new file mode 100644
index 0000000..b20095f
--- /dev/null
+++ b/demo/src/main/java/com/example/demo/bean/borrowrecord.java
@@ -0,0 +1,66 @@
+package com.example.demo.bean;
+
+
+import org.springframework.boot.autoconfigure.domain.EntityScan;
+
+@EntityScan
+public class borrowrecord {
+    @GeneratedValue(strategy=GenerationType.AUTO)
+    @ID
+    private long s_id;
+    private long book_id;
+    private string s_name;
+
+    public long getS_id() {
+        return s_id;
+    }
+
+    public void setS_id(long s_id) {
+        this.s_id = s_id;
+    }
+
+    public long getBook_id() {
+        return book_id;
+    }
+
+    public void setBook_id(long book_id) {
+        this.book_id = book_id;
+    }
+
+    public string getS_name() {
+        return s_name;
+    }
+
+    public void setS_name(string s_name) {
+        this.s_name = s_name;
+    }
+
+    public string getBook_name() {
+        return book_name;
+    }
+
+    public void setBook_name(string book_name) {
+        this.book_name = book_name;
+    }
+
+    public string getBorrowtime() {
+        return borrowtime;
+    }
+
+    public void setBorrowtime(string borrowtime) {
+        this.borrowtime = borrowtime;
+    }
+
+    public string getSenttime() {
+        return senttime;
+    }
+
+    public void setSenttime(string senttime) {
+        this.senttime = senttime;
+    }
+
+    private string book_name;
+    private string  borrowtime;
+    private string senttime;
+    public borrowrecord(){};
+}
diff --git a/demo/src/main/java/com/example/demo/bean/student.java b/demo/src/main/java/com/example/demo/bean/student.java
new file mode 100644
index 0000000..bb41d52
--- /dev/null
+++ b/demo/src/main/java/com/example/demo/bean/student.java
@@ -0,0 +1,38 @@
+package com.example.demo.bean;
+
+import org.springframework.boot.autoconfigure.domain.EntityScan;
+@EntityScan
+public class student {
+    @GeneratedValue(strategy=GenerationType.AUTO)
+    @ID
+    private long s_id;
+    private String s_name;
+    private String s_password;
+
+    public long getS_id() {
+        return s_id;
+    }
+
+    public void setS_id(long s_id) {
+        this.s_id = s_id;
+    }
+
+    public String getS_name() {
+        return s_name;
+    }
+
+    public void setS_name(string s_name) {
+        this.s_name = s_name;
+    }
+
+    public string getS_password() {
+        return s_password;
+    }
+
+    public void setS_password(string s_password) {
+        this.s_password = s_password;
+    }
+
+    public student() {};
+}
+
diff --git a/demo/src/main/resources/application.properties b/demo/src/main/resources/application.properties
new file mode 100644
index 0000000..e69de29
diff --git a/demo/src/test/java/com/example/demo/DemoApplicationTests.java b/demo/src/test/java/com/example/demo/DemoApplicationTests.java
new file mode 100644
index 0000000..2876223
--- /dev/null
+++ b/demo/src/test/java/com/example/demo/DemoApplicationTests.java
@@ -0,0 +1,17 @@
+package com.example.demo;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.test.context.junit4.SpringRunner;
+
+@RunWith(SpringRunner.class)
+@SpringBootTest
+public class DemoApplicationTests {
+
+	@Test
+	public void contextLoads() {
+	}
+
+}
+