diff --git a/src/FruitandVegetableGuide/.idea/gradle.xml b/src/FruitandVegetableGuide/.idea/gradle.xml
index a2d7c21..ae388c2 100644
--- a/src/FruitandVegetableGuide/.idea/gradle.xml
+++ b/src/FruitandVegetableGuide/.idea/gradle.xml
@@ -7,6 +7,7 @@
         <option name="testRunner" value="GRADLE" />
         <option name="distributionType" value="DEFAULT_WRAPPED" />
         <option name="externalProjectPath" value="$PROJECT_DIR$" />
+        <option name="gradleJvm" value="jbr-17" />
         <option name="modules">
           <set>
             <option value="$PROJECT_DIR$" />
diff --git a/src/FruitandVegetableGuide/.idea/misc.xml b/src/FruitandVegetableGuide/.idea/misc.xml
index 773fe0f..0ad17cb 100644
--- a/src/FruitandVegetableGuide/.idea/misc.xml
+++ b/src/FruitandVegetableGuide/.idea/misc.xml
@@ -1,6 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
   <component name="ExternalStorageConfigurationManager" enabled="true" />
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_17" project-jdk-name="jbr-17" project-jdk-type="JavaSDK">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_17" default="true" project-jdk-name="jbr-17" project-jdk-type="JavaSDK">
     <output url="file://$PROJECT_DIR$/build/classes" />
   </component>
   <component name="ProjectType">
diff --git a/src/FruitandVegetableGuide/app/build.gradle b/src/FruitandVegetableGuide/app/build.gradle
index 11eafab..824fb9c 100644
--- a/src/FruitandVegetableGuide/app/build.gradle
+++ b/src/FruitandVegetableGuide/app/build.gradle
@@ -47,6 +47,8 @@ android {
 }
 
 dependencies {
+    implementation "androidx.compose.foundation:foundation:1.0.0"
+    implementation "androidx.lifecycle:lifecycle-viewmodel-compose:1.0.0-alpha07"
     //用于compose权限的使用
     implementation("com.google.accompanist:accompanist-permissions:0.31.0-alpha")
 //闪光
@@ -64,6 +66,7 @@ dependencies {
     implementation 'androidx.core:core-ktx:+'
     implementation 'androidx.core:core-ktx:+'
     implementation 'androidx.core:core-ktx:+'
+    implementation files('libs\\jtds-1.3.1.jar')
 
     def composeBom = platform('androidx.compose:compose-bom:2023.08.00')
     implementation(composeBom)
@@ -86,5 +89,4 @@ dependencies {
     testImplementation 'junit:junit:4.13.2'
     androidTestImplementation 'androidx.test.ext:junit:1.1.5'
     androidTestImplementation 'androidx.test.espresso:espresso-core:3.5.1'
-
 }
diff --git a/src/FruitandVegetableGuide/app/libs/jtds-1.3.1.jar b/src/FruitandVegetableGuide/app/libs/jtds-1.3.1.jar
new file mode 100644
index 0000000..d866860
Binary files /dev/null and b/src/FruitandVegetableGuide/app/libs/jtds-1.3.1.jar differ
diff --git a/src/FruitandVegetableGuide/app/src/main/java/com/example/fruitandvegetableguide/MyActivity.kt b/src/FruitandVegetableGuide/app/src/main/java/com/example/fruitandvegetableguide/MyActivity.kt
index 90b272f..7fbb51e 100644
--- a/src/FruitandVegetableGuide/app/src/main/java/com/example/fruitandvegetableguide/MyActivity.kt
+++ b/src/FruitandVegetableGuide/app/src/main/java/com/example/fruitandvegetableguide/MyActivity.kt
@@ -1,6 +1,7 @@
 package com.example.fruitandvegetableguide
 
 import android.os.Bundle
+import android.os.StrictMode
 import androidx.activity.compose.setContent
 import androidx.appcompat.app.AppCompatActivity
 import androidx.compose.foundation.layout.fillMaxSize
@@ -16,6 +17,10 @@ import com.example.fruitandvegetableguide.ui.theme.FruitandVegetableGuideTheme
 class MyActivity : AppCompatActivity() {
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
+
+        val policy = StrictMode.ThreadPolicy.Builder().permitAll().build()
+        StrictMode.setThreadPolicy(policy)
+
         setContent {
             FruitandVegetableGuideTheme() {
                 Surface(
diff --git a/src/FruitandVegetableGuide/app/src/main/java/com/example/fruitandvegetableguide/data/dbhelper/DBHelper.kt b/src/FruitandVegetableGuide/app/src/main/java/com/example/fruitandvegetableguide/data/dbhelper/DBHelper.kt
index 9a2ff1b..5e69361 100644
--- a/src/FruitandVegetableGuide/app/src/main/java/com/example/fruitandvegetableguide/data/dbhelper/DBHelper.kt
+++ b/src/FruitandVegetableGuide/app/src/main/java/com/example/fruitandvegetableguide/data/dbhelper/DBHelper.kt
@@ -1,3 +1,363 @@
 package com.example.fruitandvegetableguide.data.dbhelper
 
 // TODO 这里放数据库工具方法，这些方法可以去网上找现成的
+import android.util.Log
+import androidx.compose.runtime.rememberCompositionContext
+import com.example.fruitandvegetableguide.R
+import com.example.fruitandvegetableguide.data.Guide
+import com.example.fruitandvegetableguide.data.Post
+import java.sql.Connection
+import java.sql.DriverManager
+import java.sql.PreparedStatement
+import java.sql.ResultSet
+import java.sql.SQLException
+import kotlinx.coroutines.*
+object DbHelper {
+    //private const val DB_URL = "jdbc:sqlserver://rm-2ze1sd060o140gu067o.sqlserver.rds.aliyuncs.com:3433;databaseName=FruitandVegetableGuide"
+    private const val DB_URL = "jdbc:jtds:sqlserver://rm-2ze1sd060o140gu067o.sqlserver.rds.aliyuncs.com:3433/FruitandVegetableGuide"
+    private const val USER = "aruan"
+    private const val PASS = "WRLXwrlx465434"
+
+    fun connect(): Connection? {
+        var conn: Connection? = null
+        try {
+            Class.forName("net.sourceforge.jtds.jdbc.Driver")
+            conn = DriverManager.getConnection(DB_URL, USER, PASS)
+        } catch (e: SQLException) {
+            e.printStackTrace()
+        } catch (e: ClassNotFoundException) {
+            e.printStackTrace()
+        }
+        return conn
+    }
+
+    fun closeConnection(conn: Connection?) {
+        try {
+            conn?.close()
+        } catch (e: SQLException) {
+            e.printStackTrace()
+        }
+    }
+
+
+    fun login(username: String, password: String): Int {
+        val conn = connect()
+        var userId = -1 // 默认为 -1，表示未找到用户或不匹配
+        if (conn != null) {
+            try {
+                val selectQuery = "SELECT id, password FROM Account WHERE username = ?"
+                val preparedStatement = conn.prepareStatement(selectQuery)
+                preparedStatement.setString(1, username) // 使用用户名作为参数
+                val resultSet = preparedStatement.executeQuery()
+                if (resultSet.next()) {
+                    val storedPassword = resultSet.getString("password")
+                    val userIdFromDB = resultSet.getInt("id")
+                    // 检查提供的密码与数据库中存储的密码是否匹配
+                    if (storedPassword == password) {
+                        userId = userIdFromDB // 密码匹配，将用户 ID 设置为查询到的 ID
+                    }
+                }
+                resultSet.close()
+                preparedStatement.close()
+            } catch (e: SQLException) {
+                e.printStackTrace()
+            } finally {
+                closeConnection(conn)
+            }
+        }
+        return userId
+    }
+    fun register(username: String, password: String): Boolean {
+        val conn = connect()
+        var rowsAffected = 0
+        if (conn != null) {
+            try {
+                val insertQuery = "INSERT INTO Account (username, password) VALUES (?, ?)"
+                val preparedStatement = conn.prepareStatement(insertQuery)
+                preparedStatement.setString(1, username)
+                preparedStatement.setString(2, password)
+                rowsAffected = preparedStatement.executeUpdate()
+                preparedStatement.close()
+
+            } catch (e: SQLException) {
+                e.printStackTrace()
+            } finally {
+                closeConnection(conn)
+            }
+        }
+        return rowsAffected > 0
+    }
+    //未测试
+    fun postListInit(): MutableList<Post> {
+        val conn = connect()
+        val posts = mutableListOf<Post>()
+
+        if (conn != null) {
+            try {
+                val postQuery = "SELECT * FROM Post LIMIT 100" // 假设post表是你的帖子表
+
+                val preparedStatement = conn.prepareStatement(postQuery)
+                val resultSet = preparedStatement.executeQuery()
+                while (resultSet.next()) {
+                    val id = resultSet.getInt("id")
+                    val userId = resultSet.getInt("userId")
+                    val title = resultSet.getString("title")
+                    val labels = resultSet.getString("labels")
+                    val content = resultSet.getString("content")
+                    val post = Post(id, userId, title, labels = labels, content = content)
+                    posts.add(post)
+                }
+                preparedStatement.close()
+            } catch (e: SQLException) {
+                e.printStackTrace()
+            } finally {
+                closeConnection(conn)
+            }
+        }
+        println("贴子初始化成功")
+        return posts
+    }
+    fun getPostByPostId(postId: Int): Post {
+        val conn = connect()
+        var post = Post(0, 0, "", labels = "", content = "")
+        if (conn != null) {
+            try {
+                val postQuery = "select * from Post where id = ?"
+                val preparedStatement = conn.prepareStatement(postQuery)
+                preparedStatement.setInt(1, postId)
+                val resultSet = preparedStatement.executeQuery()
+                resultSet.next()
+                val id = resultSet.getInt("id")
+                val userId = resultSet.getInt("userId")
+                val title = resultSet.getString("title")
+                val labels = resultSet.getString("labels")
+                val content = resultSet.getString("content")
+                post = Post(id = id, userId = userId, title = title, labels = labels, content = content)
+                preparedStatement.close()
+            } catch (e: SQLException) {
+                e.printStackTrace()
+            } finally {
+                closeConnection(conn)
+            }
+        }
+        return post
+    }
+    fun getGuideByKind(kind: String): List<Guide> {
+        var guides = mutableListOf<Guide>()
+        var coon = connect()
+        if(coon != null){
+            try{
+                val guideQuery = "select * from Guide where kind = ?"
+                val preparedStatement = coon.prepareStatement(guideQuery)
+                preparedStatement.setString(1, kind)
+                val resultSet = preparedStatement.executeQuery()
+                while(resultSet.next()) {
+                    val id = resultSet.getInt("id")
+                    val kind = resultSet.getString("kind")
+                    val identify = resultSet.getString("identify")
+                    val suitable = resultSet.getString("suitable")
+                    val taboo = resultSet.getString("taboo")
+                    val nutritiveValue = resultSet.getString("nutritiveValue")
+                    val recommendedMenu = resultSet.getString("recommendedMenu")
+                    val guide = Guide(id, kind = kind, identify = identify, suitable = suitable, taboo = taboo, nutritiveValue = nutritiveValue, recommendedMenu = recommendedMenu)
+                    guides.add(guide)
+                }
+                preparedStatement.close()
+            }catch(e: SQLException){
+                e.printStackTrace()
+            }finally{
+                closeConnection(coon)
+            }
+        }
+        return guides
+    }
+    fun getPostByLabels(labels: String): List<Post> {
+        var posts = mutableListOf<Post>()
+        var coon = connect()
+        if(coon != null){
+            try{
+                val postQuery = "select * from Post where labels LIKE ?"
+                val preparedStatement = coon.prepareStatement(postQuery)
+                val temp = "%$labels%"
+                preparedStatement.setString(1, temp)
+                val resultSet = preparedStatement.executeQuery()
+                while(resultSet.next()) {
+                    val id = resultSet.getInt("id")
+                    val userid = resultSet.getInt("userid")
+                    val title = resultSet.getString("title")
+                    val labels = resultSet.getString("labels")
+                    val content = resultSet.getString("content")
+                    val post = Post(id, userid, title, labels = labels, content = content)
+                    posts.add(post)
+                }
+                preparedStatement.close()
+            }catch(e: SQLException){
+                //e.printStackTrace()
+            }finally{
+                closeConnection(coon)
+            }
+        }
+
+        return posts
+    }
+    fun getGuideByGuideId(guideId: Int): Guide {
+        val conn = connect()
+        var guide = Guide(0, kind = "", identify = "", suitable = "", taboo = "", nutritiveValue = "", recommendedMenu = "")
+        if (conn != null) {
+            try {
+
+                val guideQuery = "select * from Guide where id = ?"
+                val preparedStatement = conn.prepareStatement(guideQuery)
+                preparedStatement.setInt(1, guideId)
+                val resultSet = preparedStatement.executeQuery()
+                resultSet.next()
+                val id = resultSet.getInt("id")
+                val kind = resultSet.getString("kind")
+                val identify = resultSet.getString("identify")
+                val suitable = resultSet.getString("suitable")
+                val taboo = resultSet.getString("taboo")
+                val nutritiveValue = resultSet.getString("nutritiveValue")
+                val recommendedMenu = resultSet.getString("recommendedMenu")
+                guide = Guide(id=guideId, kind = kind, identify = identify, suitable = suitable, taboo = taboo, nutritiveValue = nutritiveValue, recommendedMenu = recommendedMenu)
+                preparedStatement.close()
+            } catch (e: SQLException) {
+                e.printStackTrace()
+            } finally {
+                closeConnection(conn)
+            }
+        }
+        return guide
+    }
+    //未测试
+    fun guideListInit(): List<Guide> {
+        val conn = connect()
+        val guides = mutableListOf<Guide>()
+
+        if (conn != null) {
+            try {
+                val guideQuery = "SELECT * FROM Guide LIMIT 100" // 假设post表是你的帖子表
+
+                val preparedStatement = conn.prepareStatement(guideQuery)
+                val resultSet = preparedStatement.executeQuery()
+                while (resultSet.next()) {
+                    val id = resultSet.getInt("id")
+                    val kind = resultSet.getString("kind")
+                    val identify = resultSet.getString("identify")
+                    val suitable = resultSet.getString("suitable")
+                    val taboo = resultSet.getString("taboo")
+                    val nutritiveValue = resultSet.getString("nutritiveValue")
+                    val recommendedMenu = resultSet.getString("recommendedMenu")
+                    val guide = Guide(id, kind = kind, identify = identify, suitable = suitable, taboo = taboo, nutritiveValue = nutritiveValue, recommendedMenu = recommendedMenu)
+                    guides.add(guide)
+                }
+                preparedStatement.close()
+            } catch (e: SQLException) {
+                e.printStackTrace()
+            } finally {
+                closeConnection(conn)
+            }
+        }
+        println("guideListInit成功")
+        return guides
+    }
+    fun postInsert(userid: Int, title: String, imgId: Int = R.drawable.loading, labels: String, content: String) : Boolean{
+        val coon = connect()
+        var rowsAffected = 0
+        if(coon != null){
+            try{
+                val postInsert = "insert into Post (userId, title, imgId, labels, content) values (?, ?, ?, ?, ?)"
+                val preparedStatement = coon.prepareStatement(postInsert)
+                preparedStatement.setInt(1, userid);
+                preparedStatement.setString(2, title)
+                preparedStatement.setInt(3, imgId)
+                preparedStatement.setString(4, labels)
+                preparedStatement.setString(5, content)
+                rowsAffected = preparedStatement.executeUpdate()
+                preparedStatement.close()
+            }catch (e: SQLException){
+                e.printStackTrace()
+            }finally{
+                closeConnection(coon)
+            }
+        }
+        println("postInsert成功")
+        return rowsAffected > 0
+    }
+    fun getUsernameByUserid(userid: Int): String {
+        val coon = connect()
+        var username = ""
+        if(coon != null){
+            try{
+                val accountQuery = "select * from Account where id = ?"
+                val preparedStatement = coon.prepareStatement(accountQuery)
+                preparedStatement.setInt(1, userid)
+                val resultSet = preparedStatement.executeQuery()
+                resultSet.next()
+                username = resultSet.getString("username")
+                preparedStatement.close()
+            }catch (e:SQLException){
+                e.printStackTrace()
+            }finally {
+                closeConnection(coon)
+            }
+        }
+        println("getUsernameByUserid成功")
+        return username
+    }
+    fun getPostByUserid(userid: Int): List<Post> {
+        var posts = mutableListOf<Post>()
+        var coon = connect()
+        if(coon != null){
+            try{
+                val postQuery = "select * from Post where userID = ?"
+                val preparedStatement = coon.prepareStatement(postQuery)
+                preparedStatement.setInt(1, userid)
+                val resultSet = preparedStatement.executeQuery()
+                while(resultSet.next()) {
+                    val id = resultSet.getInt("id")
+                    val userid = resultSet.getInt("userid")
+                    val title = resultSet.getString("title")
+                    val labels = resultSet.getString("labels")
+                    val content = resultSet.getString("content")
+                    val post = Post(id, userid, title, labels = labels, content = content)
+                    posts.add(post)
+                }
+                preparedStatement.close()
+            }catch(e: SQLException){
+                e.printStackTrace()
+            }finally{
+                closeConnection(coon)
+            }
+        }
+        return posts
+    }
+    //有问题
+    fun DeletePost(postToDeleteList: List<Post>): Boolean {
+        var coon = connect()
+        var rowsAffected = 0
+        if(coon != null){
+            try{
+                val postDelete = "delete from Post where id = ?"
+                val preparedStatement = coon.prepareStatement(postDelete)
+                for (post in postToDeleteList) {
+                    preparedStatement.setInt(1, post.id)
+                    val resultSet = preparedStatement.executeUpdate()
+                    if(resultSet > 0) rowsAffected++
+                }
+                preparedStatement.close()
+            }catch(e: SQLException){
+                e.printStackTrace()
+            }finally{
+                closeConnection(coon)
+            }
+        }
+        if(rowsAffected == postToDeleteList.size) {
+            println("DeletePost成功")
+            return true
+        }
+        //println("DeletePost失败")
+        return false
+    }
+
+}
+
diff --git a/src/FruitandVegetableGuide/app/src/main/java/com/example/fruitandvegetableguide/utils/Utils.kt b/src/FruitandVegetableGuide/app/src/main/java/com/example/fruitandvegetableguide/utils/Utils.kt
index e11cc06..af03860 100644
--- a/src/FruitandVegetableGuide/app/src/main/java/com/example/fruitandvegetableguide/utils/Utils.kt
+++ b/src/FruitandVegetableGuide/app/src/main/java/com/example/fruitandvegetableguide/utils/Utils.kt
@@ -3,9 +3,11 @@ package com.example.fruitandvegetableguide.utils
 import com.example.fruitandvegetableguide.R
 import com.example.fruitandvegetableguide.data.Guide
 import com.example.fruitandvegetableguide.data.Post
+import com.example.fruitandvegetableguide.data.dbhelper.DbHelper
 import com.example.fruitandvegetableguide.data.local.LocalAccountsDataProvider
 import com.example.fruitandvegetableguide.data.local.LocalGuidesDataProvider
 import com.example.fruitandvegetableguide.data.local.LocalPostsDataProvider
+import kotlinx.coroutines.*
 
 // TODO 这里放页面逻辑相关代码，要自己写，通过调用数据库工具方法实现
 // 输入参数和返回参数不要改
@@ -16,12 +18,13 @@ fun loginVerification(username: String, password: String): Int {
     // 逻辑：查询用户表，用户名和密码正确返回id;用户名和密码不匹配返回-1;用户表中没有该用户名返回-1
     // 输出：id或-1
     // 将下面的测试代码注释掉，完成需要的代码，之后的TODO同此
-    if (password == "123456") {
+    /*    if (password == "123456") {
         if (username == "aaa") return 1
         if (username == "bbb") return 2
         if (username == "ccc") return 3
     }
-    return -1
+    return -1*/
+    return DbHelper.login(username, password)
 }
 
 fun register(username: String, password: String): Boolean {
@@ -30,7 +33,8 @@ fun register(username: String, password: String): Boolean {
     // 逻辑：插入用户表;插入成功返回true;插入失败返回false
     // 输出：true或false
     // 将下面的测试代码注释掉，完成需要的代码
-    return true
+//    return true
+    return DbHelper.register(username, password)
 }
 
 fun postListInit(): List<Post> {
@@ -40,7 +44,8 @@ fun postListInit(): List<Post> {
     //      查询的每一行帖子数据封装成Post数据类实例，即每一行数据信息都可以用来声明一个Post数据类对象，然后将这些对象封装成一个列表，使用mutableListOf
     // 输出：列表
     // 将下面的测试代码注释掉，完成需要的代码
-    return LocalPostsDataProvider.allPosts
+//    return LocalPostsDataProvider.allPosts
+    return DbHelper.postListInit()
 }
 
 fun getPostByPostId(postId: Int): Post {
@@ -50,12 +55,13 @@ fun getPostByPostId(postId: Int): Post {
     //      查询的数据信息封装成一个Post数据类对象
     // 输出：Post对象
     // 将下面的测试代码注释掉，完成需要的代码
-    for (post in LocalPostsDataProvider.allPosts) {
-        if (post.id == postId) {
-            return post
-        }
-    }
-    return LocalPostsDataProvider.allPosts[0]
+//    for (post in LocalPostsDataProvider.allPosts) {
+//        if (post.id == postId) {
+//            return post
+//        }
+//    }
+//    return LocalPostsDataProvider.allPosts[0]
+    return DbHelper.getPostByPostId(postId)
 }
 
 fun getGuideByKind(kind: String): List<Guide> {
@@ -68,13 +74,14 @@ fun getGuideByKind(kind: String): List<Guide> {
     if (kind == "") {
         return guideListInit()
     }
-    var guides = mutableListOf<Guide>()
-    for (guide in LocalGuidesDataProvider.allGuides) {
-        if (kind in guide.kind) {
-            guides.add(guide)
-        }
-    }
-    return guides
+//    var guides = mutableListOf<Guide>()
+//    for (guide in LocalGuidesDataProvider.allGuides) {
+//        if (kind in guide.kind) {
+//            guides.add(guide)
+//        }
+//    }
+//    return guides
+    return DbHelper.getGuideByKind(kind)
 }
 
 fun getPostByLabels(labels: String): List<Post> {
@@ -87,13 +94,14 @@ fun getPostByLabels(labels: String): List<Post> {
     if (labels == "") {
         return postListInit()
     }
-    var posts = mutableListOf<Post>()
-    for (post in LocalPostsDataProvider.allPosts) {
-        if (labels in post.labels) {
-            posts.add(post)
-        }
-    }
-    return posts
+//    var posts = mutableListOf<Post>()
+//    for (post in LocalPostsDataProvider.allPosts) {
+//        if (labels in post.labels) {
+//            posts.add(post)
+//        }
+//    }
+//    return posts
+    return DbHelper.getPostByLabels(labels)
 }
 
 
@@ -104,12 +112,13 @@ fun getGuideByGuideId(guideId: Int): Guide {
     //      查询的数据信息封装成一个Guide数据类对象
     // 输出：Guide对象
     // 将下面的测试代码注释掉，完成需要的代码
-    for (guide in LocalGuidesDataProvider.allGuides) {
-        if (guide.id == guideId) {
-            return guide
-        }
-    }
-    return LocalGuidesDataProvider.allGuides[0]
+//    for (guide in LocalGuidesDataProvider.allGuides) {
+//        if (guide.id == guideId) {
+//            return guide
+//        }
+//    }
+//    return LocalGuidesDataProvider.allGuides[0]
+    return DbHelper.getGuideByGuideId(guideId)
 }
 
 fun guideListInit(): List<Guide> {
@@ -119,7 +128,7 @@ fun guideListInit(): List<Guide> {
     //      查询的每一行指南数据封装成Guide数据类实例，即每一行数据信息都可以用来声明一个Guide数据类对象，然后将这些对象封装成一个列表，使用mutableListOf
     // 输出：列表
     // 将下面的测试代码注释掉，完成需要的代码
-    return LocalGuidesDataProvider.allGuides
+    return DbHelper.guideListInit()
 }
 
 fun postInsert(
@@ -138,14 +147,15 @@ fun postInsert(
     // 逻辑：将传入的内容插入到post表。插入成功返回true，否则返回false
     // 输出：true或false
     // 将下面的测试代码注释掉，完成需要的代码
-    val newPost =
-        Post(LocalPostsDataProvider.allPosts.size + 1, userid, title, imgId, labels, content)
-    try {
-        LocalPostsDataProvider.allPosts.add(newPost)
-    } catch (e: RuntimeException) {
-        return false
-    }
-    return true
+//    val newPost =
+//        Post(LocalPostsDataProvider.allPosts.size + 1, userid, title, imgId, labels, content)
+//    try {
+//        LocalPostsDataProvider.allPosts.add(newPost)
+//    } catch (e: RuntimeException) {
+//        return false
+//    }
+//    return true
+    return DbHelper.postInsert(userid, title, imgId ,labels, content)
 }
 
 fun getUsernameByUserid(userid: Int): String {
@@ -154,12 +164,13 @@ fun getUsernameByUserid(userid: Int): String {
     // 逻辑：查询账户表，条件id==userid。
     // 输出：username
     // 将下面的测试代码注释掉，完成需要的代码
-    for (user in LocalAccountsDataProvider.allUserAccounts) {
-        if (user.id == userid) {
-            return user.username
-        }
-    }
-    return LocalAccountsDataProvider.allUserAccounts[0].username
+//    for (user in LocalAccountsDataProvider.allUserAccounts) {
+//        if (user.id == userid) {
+//            return user.username
+//        }
+//    }
+//    return LocalAccountsDataProvider.allUserAccounts[0].username
+    return DbHelper.getUsernameByUserid(userid)
 }
 
 fun getPostByUserid(userid: Int): List<Post> {
@@ -169,13 +180,14 @@ fun getPostByUserid(userid: Int): List<Post> {
     // 查询的每一行数据信息封装成一个Post数据类对象
     // 输出：Post的列表
     // 将下面的测试代码注释掉，完成需要的代码
-    var postList = mutableListOf<Post>()
-    for (post in LocalPostsDataProvider.allPosts) {
-        if (post.userId == userid) {
-            postList.add(post)
-        }
-    }
-    return postList
+//    var postList = mutableListOf<Post>()
+//    for (post in LocalPostsDataProvider.allPosts) {
+//        if (post.userId == userid) {
+//            postList.add(post)
+//        }
+//    }
+//    return postList
+    return DbHelper.getPostByUserid(userid)
 }
 
 fun DeletePost(postToDeleteList: List<Post>): Boolean {
@@ -185,12 +197,13 @@ fun DeletePost(postToDeleteList: List<Post>): Boolean {
     // 删除成功返回true，否则返回false
     // 输出：true或false
     // 将下面的测试代码注释掉，完成需要的代码
-    try {
-        for (post in postToDeleteList) {
-            LocalPostsDataProvider.allPosts.remove(post)
-        }
-    } catch (e: RuntimeException) {
-        return false
-    }
-    return true
+//    try {
+//        for (post in postToDeleteList) {
+//            LocalPostsDataProvider.allPosts.remove(post)
+//        }
+//    } catch (e: RuntimeException) {
+//        return false
+//    }
+//    return true
+    return DbHelper.DeletePost(postToDeleteList)
 }
\ No newline at end of file