Java 带MySQL的Spring Boot R2DBC-异常：未找到表

我对字符串引导和后端开发（可能三天或更短时间）非常陌生，我希望构建REST API，以便从不同的客户端使用

所以我从一个简单的演示应用开始，它有一个名为

/register

的端点。我们发布一个带有

username

和

password

的

JSON

字符串，以创建一个不存在的新用户

我将

JPA

与

HSQLDB

一起使用，它在内存上的持久性很好。但最近我想使用

RxJava

，因为我熟悉安卓系统，所以我用

MySQL

切换到

R2DBC

MySQL

服务器在端口

3306

上运行良好，应用程序在

localhost:8080上使用邮递员进行了测试

当我尝试查询users表或插入实体时，会出现如下问题：

{
    "timestamp": "2020-03-22T11:54:43.466+0000",
    "status": 500,
    "error": "Internal Server Error",
    "message": "execute; bad SQL grammar [UPDATE user_entity SET username = $1, password = $2 WHERE user_entity.id = $3]; nested exception is io.r2dbc.spi.R2dbcBadGrammarException: [42102] [42S02] Table \"USER_ENTITY\" not found; SQL statement:\nUPDATE user_entity SET username = $1, password = $2 WHERE user_entity.id = $3 [42102-200]",
    "path": "/register"
}

import org.jetbrains.kotlin.gradle.tasks.KotlinCompile

plugins {
    id("org.springframework.boot") version "2.2.5.RELEASE"
    id("io.spring.dependency-management") version "1.0.9.RELEASE"
    kotlin("jvm") version "1.3.61"
    kotlin("plugin.spring") version "1.3.61"
}

group = "com.tamimattafi.backend"
version = "0.0.1-SNAPSHOT"
java.sourceCompatibility = JavaVersion.VERSION_11

repositories {
    mavenCentral()
    maven(url = "https://repo.spring.io/milestone")
}

dependencies {
    //SPRING BOOT
    implementation("org.springframework.boot:spring-boot-starter-security")
    implementation("org.springframework.boot:spring-boot-starter-web")
    implementation("org.springframework.boot.experimental:spring-boot-starter-data-r2dbc")

    //KOTLIN
    implementation("com.fasterxml.jackson.module:jackson-module-kotlin")
    implementation("org.jetbrains.kotlin:kotlin-reflect")
    implementation("org.jetbrains.kotlin:kotlin-stdlib-jdk8")

    //RX JAVA
    implementation("io.reactivex.rxjava2:rxjava:2.2.0")
    implementation("io.reactivex:rxjava-reactive-streams:1.2.1")

    //MYSQL
    implementation("dev.miku:r2dbc-mysql:0.8.1.RELEASE")
    implementation("io.r2dbc:r2dbc-pool")
    runtimeOnly("mysql:mysql-connector-java")

    //TEST
    testImplementation("org.springframework.boot:spring-boot-starter-test") {
        exclude(group = "org.junit.vintage", module = "junit-vintage-engine")
    }
    testImplementation("org.springframework.security:spring-security-test")
    testImplementation("io.projectreactor:reactor-test")
    testImplementation("org.springframework.boot.experimental:spring-boot-test-autoconfigure-r2dbc")
}

dependencyManagement {
    imports {
        mavenBom("org.springframework.boot.experimental:spring-boot-bom-r2dbc:0.1.0.M3")
    }
}

tasks.withType<Test> {
    useJUnitPlatform()
}

tasks.withType<KotlinCompile> {
    kotlinOptions {
        freeCompilerArgs = listOf("-Xjsr305=strict")
        jvmTarget = "1.8"
    }
}

这是例外情况的完整信息

我已经寻找了几个小时的解决方案，但似乎在任何地方都找不到，所以我希望我能在这里找到它

让我们对项目进行细分，以便更容易找到解决方案：
1。数据库：

logging.level.org.springframework.data.r2dbc=DEBUG
spring.datasource.url=jdbc:mysql://localhost:3306/demodb
spring.datasource.username=root
spring.datasource.password=root

@Configuration
@EnableR2dbcRepositories
class DatabaseConfiguration : AbstractR2dbcConfiguration() {

    override fun connectionFactory(): ConnectionFactory
         = ConnectionFactories.get(
                builder().option(DRIVER, "mysql")
                    .option(HOST, "localhost")
                    .option(USER, "root")
                    .option(PASSWORD, "root") 
                    .option(DATABASE, "demodb")
                    .build()
        )


}

@RequestMapping("/register")
@RestController
class RegistrationController @Autowired constructor(private val userService: UserService) {

    @PostMapping
    fun login(@RequestBody registrationRequest: RegistrationRequest): Single<ResponseEntity<String>>
        = userService.userExists(registrationRequest.username)
            .flatMap { exists -> handleUserExistance(exists, registrationRequest) }
    
    private fun handleUserExistance(exists: Boolean, registrationRequest: RegistrationRequest): Single<ResponseEntity<String>> 
        = if (exists) Single.just(ResponseEntity("Username already exists. Please try an other one", HttpStatus.CONFLICT))
            else userService.insert(User(registrationRequest.username, registrationRequest.password)).map { user ->
                ResponseEntity("User was successfully created with the id: ${user.id}", HttpStatus.CREATED)
            }
    
}

@Service
class UserService @Autowired constructor(override val repository: IRxUserRepository) : RxSimpleService<User, UserEntity>(repository) {

    override val converter: EntityConverter<User, UserEntity> = UserEntity.Converter

    fun userExists(username: String): Single<Boolean>
        = repository.existsByUsername(username)

}

abstract class RxSimpleService<T, E>(protected open val repository: RxJava2CrudRepository<E, Long>)  {

    protected abstract val converter: EntityConverter<T, E>

    open fun insert(model: T): Single<T>
        = repository.save(converter.fromModel(model))
            .map(converter::toModel)

    open fun get(id: Long): Maybe<T>
        = repository.findById(id)
            .map(converter::toModel)

    open fun getAll(): Single<ArrayList<T>>
        = repository.findAll()
            .toList()
            .map(converter::toModels)

    open fun delete(model: T): Completable
        = repository.delete(converter.fromModel(model))

}

@Repository
interface IRxUserRepository : RxJava2CrudRepository<UserEntity, Long> {

    @Query("SELECT CASE WHEN EXISTS ( SELECT * FROM ${UserEntity.TABLE_NAME} WHERE username = :username) THEN CAST(1 AS BIT) ELSE CAST(0 AS BIT) END")
    fun existsByUsername(username: String): Single<Boolean>

}


2。应用程序。属性：

logging.level.org.springframework.data.r2dbc=DEBUG
spring.datasource.url=jdbc:mysql://localhost:3306/demodb
spring.datasource.username=root
spring.datasource.password=root

@Configuration
@EnableR2dbcRepositories
class DatabaseConfiguration : AbstractR2dbcConfiguration() {

    override fun connectionFactory(): ConnectionFactory
         = ConnectionFactories.get(
                builder().option(DRIVER, "mysql")
                    .option(HOST, "localhost")
                    .option(USER, "root")
                    .option(PASSWORD, "root") 
                    .option(DATABASE, "demodb")
                    .build()
        )


}

@RequestMapping("/register")
@RestController
class RegistrationController @Autowired constructor(private val userService: UserService) {

    @PostMapping
    fun login(@RequestBody registrationRequest: RegistrationRequest): Single<ResponseEntity<String>>
        = userService.userExists(registrationRequest.username)
            .flatMap { exists -> handleUserExistance(exists, registrationRequest) }
    
    private fun handleUserExistance(exists: Boolean, registrationRequest: RegistrationRequest): Single<ResponseEntity<String>> 
        = if (exists) Single.just(ResponseEntity("Username already exists. Please try an other one", HttpStatus.CONFLICT))
            else userService.insert(User(registrationRequest.username, registrationRequest.password)).map { user ->
                ResponseEntity("User was successfully created with the id: ${user.id}", HttpStatus.CREATED)
            }
    
}

@Service
class UserService @Autowired constructor(override val repository: IRxUserRepository) : RxSimpleService<User, UserEntity>(repository) {

    override val converter: EntityConverter<User, UserEntity> = UserEntity.Converter

    fun userExists(username: String): Single<Boolean>
        = repository.existsByUsername(username)

}

abstract class RxSimpleService<T, E>(protected open val repository: RxJava2CrudRepository<E, Long>)  {

    protected abstract val converter: EntityConverter<T, E>

    open fun insert(model: T): Single<T>
        = repository.save(converter.fromModel(model))
            .map(converter::toModel)

    open fun get(id: Long): Maybe<T>
        = repository.findById(id)
            .map(converter::toModel)

    open fun getAll(): Single<ArrayList<T>>
        = repository.findAll()
            .toList()
            .map(converter::toModels)

    open fun delete(model: T): Completable
        = repository.delete(converter.fromModel(model))

}

@Repository
interface IRxUserRepository : RxJava2CrudRepository<UserEntity, Long> {

    @Query("SELECT CASE WHEN EXISTS ( SELECT * FROM ${UserEntity.TABLE_NAME} WHERE username = :username) THEN CAST(1 AS BIT) ELSE CAST(0 AS BIT) END")
    fun existsByUsername(username: String): Single<Boolean>

}

3。数据库配置：

logging.level.org.springframework.data.r2dbc=DEBUG
spring.datasource.url=jdbc:mysql://localhost:3306/demodb
spring.datasource.username=root
spring.datasource.password=root

@Configuration
@EnableR2dbcRepositories
class DatabaseConfiguration : AbstractR2dbcConfiguration() {

    override fun connectionFactory(): ConnectionFactory
         = ConnectionFactories.get(
                builder().option(DRIVER, "mysql")
                    .option(HOST, "localhost")
                    .option(USER, "root")
                    .option(PASSWORD, "root") 
                    .option(DATABASE, "demodb")
                    .build()
        )


}

@RequestMapping("/register")
@RestController
class RegistrationController @Autowired constructor(private val userService: UserService) {

    @PostMapping
    fun login(@RequestBody registrationRequest: RegistrationRequest): Single<ResponseEntity<String>>
        = userService.userExists(registrationRequest.username)
            .flatMap { exists -> handleUserExistance(exists, registrationRequest) }
    
    private fun handleUserExistance(exists: Boolean, registrationRequest: RegistrationRequest): Single<ResponseEntity<String>> 
        = if (exists) Single.just(ResponseEntity("Username already exists. Please try an other one", HttpStatus.CONFLICT))
            else userService.insert(User(registrationRequest.username, registrationRequest.password)).map { user ->
                ResponseEntity("User was successfully created with the id: ${user.id}", HttpStatus.CREATED)
            }
    
}

@Service
class UserService @Autowired constructor(override val repository: IRxUserRepository) : RxSimpleService<User, UserEntity>(repository) {

    override val converter: EntityConverter<User, UserEntity> = UserEntity.Converter

    fun userExists(username: String): Single<Boolean>
        = repository.existsByUsername(username)

}

abstract class RxSimpleService<T, E>(protected open val repository: RxJava2CrudRepository<E, Long>)  {

    protected abstract val converter: EntityConverter<T, E>

    open fun insert(model: T): Single<T>
        = repository.save(converter.fromModel(model))
            .map(converter::toModel)

    open fun get(id: Long): Maybe<T>
        = repository.findById(id)
            .map(converter::toModel)

    open fun getAll(): Single<ArrayList<T>>
        = repository.findAll()
            .toList()
            .map(converter::toModels)

    open fun delete(model: T): Completable
        = repository.delete(converter.fromModel(model))

}

@Repository
interface IRxUserRepository : RxJava2CrudRepository<UserEntity, Long> {

    @Query("SELECT CASE WHEN EXISTS ( SELECT * FROM ${UserEntity.TABLE_NAME} WHERE username = :username) THEN CAST(1 AS BIT) ELSE CAST(0 AS BIT) END")
    fun existsByUsername(username: String): Single<Boolean>

}

4。注册控制器：

logging.level.org.springframework.data.r2dbc=DEBUG
spring.datasource.url=jdbc:mysql://localhost:3306/demodb
spring.datasource.username=root
spring.datasource.password=root

@Configuration
@EnableR2dbcRepositories
class DatabaseConfiguration : AbstractR2dbcConfiguration() {

    override fun connectionFactory(): ConnectionFactory
         = ConnectionFactories.get(
                builder().option(DRIVER, "mysql")
                    .option(HOST, "localhost")
                    .option(USER, "root")
                    .option(PASSWORD, "root") 
                    .option(DATABASE, "demodb")
                    .build()
        )


}

@RequestMapping("/register")
@RestController
class RegistrationController @Autowired constructor(private val userService: UserService) {

    @PostMapping
    fun login(@RequestBody registrationRequest: RegistrationRequest): Single<ResponseEntity<String>>
        = userService.userExists(registrationRequest.username)
            .flatMap { exists -> handleUserExistance(exists, registrationRequest) }
    
    private fun handleUserExistance(exists: Boolean, registrationRequest: RegistrationRequest): Single<ResponseEntity<String>> 
        = if (exists) Single.just(ResponseEntity("Username already exists. Please try an other one", HttpStatus.CONFLICT))
            else userService.insert(User(registrationRequest.username, registrationRequest.password)).map { user ->
                ResponseEntity("User was successfully created with the id: ${user.id}", HttpStatus.CREATED)
            }
    
}

@Service
class UserService @Autowired constructor(override val repository: IRxUserRepository) : RxSimpleService<User, UserEntity>(repository) {

    override val converter: EntityConverter<User, UserEntity> = UserEntity.Converter

    fun userExists(username: String): Single<Boolean>
        = repository.existsByUsername(username)

}

abstract class RxSimpleService<T, E>(protected open val repository: RxJava2CrudRepository<E, Long>)  {

    protected abstract val converter: EntityConverter<T, E>

    open fun insert(model: T): Single<T>
        = repository.save(converter.fromModel(model))
            .map(converter::toModel)

    open fun get(id: Long): Maybe<T>
        = repository.findById(id)
            .map(converter::toModel)

    open fun getAll(): Single<ArrayList<T>>
        = repository.findAll()
            .toList()
            .map(converter::toModels)

    open fun delete(model: T): Completable
        = repository.delete(converter.fromModel(model))

}

@Repository
interface IRxUserRepository : RxJava2CrudRepository<UserEntity, Long> {

    @Query("SELECT CASE WHEN EXISTS ( SELECT * FROM ${UserEntity.TABLE_NAME} WHERE username = :username) THEN CAST(1 AS BIT) ELSE CAST(0 AS BIT) END")
    fun existsByUsername(username: String): Single<Boolean>

}

@RequestMapping（“/register”）
@RestController
类注册控制器@Autowired构造函数（私有val userService:userService）{
@邮戳
有趣的登录（@RequestBody registrationRequest:registrationRequest）：单一
=userService.userExists（registrationRequest.username）
.flatMap{exists->handleUserExistence（exists，registrationRequest）}
private fun handleUserExistance（存在：布尔值，注册请求：注册请求）：单个
=如果（存在）Single.just（ResponseEntity（“用户名已存在，请尝试另一个”，HttpStatus.CONFLICT））
else userService.insert（User（registrationRequest.username，registrationRequest.password））.map{User->
ResponseEntity（“用户已成功创建，id为：${User.id}”，HttpStatus.created）
}
}

5。用户服务：

logging.level.org.springframework.data.r2dbc=DEBUG
spring.datasource.url=jdbc:mysql://localhost:3306/demodb
spring.datasource.username=root
spring.datasource.password=root

@Configuration
@EnableR2dbcRepositories
class DatabaseConfiguration : AbstractR2dbcConfiguration() {

    override fun connectionFactory(): ConnectionFactory
         = ConnectionFactories.get(
                builder().option(DRIVER, "mysql")
                    .option(HOST, "localhost")
                    .option(USER, "root")
                    .option(PASSWORD, "root") 
                    .option(DATABASE, "demodb")
                    .build()
        )


}

@RequestMapping("/register")
@RestController
class RegistrationController @Autowired constructor(private val userService: UserService) {

    @PostMapping
    fun login(@RequestBody registrationRequest: RegistrationRequest): Single<ResponseEntity<String>>
        = userService.userExists(registrationRequest.username)
            .flatMap { exists -> handleUserExistance(exists, registrationRequest) }
    
    private fun handleUserExistance(exists: Boolean, registrationRequest: RegistrationRequest): Single<ResponseEntity<String>> 
        = if (exists) Single.just(ResponseEntity("Username already exists. Please try an other one", HttpStatus.CONFLICT))
            else userService.insert(User(registrationRequest.username, registrationRequest.password)).map { user ->
                ResponseEntity("User was successfully created with the id: ${user.id}", HttpStatus.CREATED)
            }
    
}

@Service
class UserService @Autowired constructor(override val repository: IRxUserRepository) : RxSimpleService<User, UserEntity>(repository) {

    override val converter: EntityConverter<User, UserEntity> = UserEntity.Converter

    fun userExists(username: String): Single<Boolean>
        = repository.existsByUsername(username)

}

abstract class RxSimpleService<T, E>(protected open val repository: RxJava2CrudRepository<E, Long>)  {

    protected abstract val converter: EntityConverter<T, E>

    open fun insert(model: T): Single<T>
        = repository.save(converter.fromModel(model))
            .map(converter::toModel)

    open fun get(id: Long): Maybe<T>
        = repository.findById(id)
            .map(converter::toModel)

    open fun getAll(): Single<ArrayList<T>>
        = repository.findAll()
            .toList()
            .map(converter::toModels)

    open fun delete(model: T): Completable
        = repository.delete(converter.fromModel(model))

}

@Repository
interface IRxUserRepository : RxJava2CrudRepository<UserEntity, Long> {

    @Query("SELECT CASE WHEN EXISTS ( SELECT * FROM ${UserEntity.TABLE_NAME} WHERE username = :username) THEN CAST(1 AS BIT) ELSE CAST(0 AS BIT) END")
    fun existsByUsername(username: String): Single<Boolean>

}

@服务
类UserService@Autowired构造函数（覆盖val存储库：IRxUserRepository）：RxSimpleService（存储库）{
覆盖val转换器：EntityConverter=UserEntity.converter
fun userExists（用户名：字符串）：单个
=repository.existsByUsername（用户名）
}

6。RxSimpleService:

logging.level.org.springframework.data.r2dbc=DEBUG
spring.datasource.url=jdbc:mysql://localhost:3306/demodb
spring.datasource.username=root
spring.datasource.password=root

@Configuration
@EnableR2dbcRepositories
class DatabaseConfiguration : AbstractR2dbcConfiguration() {

    override fun connectionFactory(): ConnectionFactory
         = ConnectionFactories.get(
                builder().option(DRIVER, "mysql")
                    .option(HOST, "localhost")
                    .option(USER, "root")
                    .option(PASSWORD, "root") 
                    .option(DATABASE, "demodb")
                    .build()
        )


}

@RequestMapping("/register")
@RestController
class RegistrationController @Autowired constructor(private val userService: UserService) {

    @PostMapping
    fun login(@RequestBody registrationRequest: RegistrationRequest): Single<ResponseEntity<String>>
        = userService.userExists(registrationRequest.username)
            .flatMap { exists -> handleUserExistance(exists, registrationRequest) }
    
    private fun handleUserExistance(exists: Boolean, registrationRequest: RegistrationRequest): Single<ResponseEntity<String>> 
        = if (exists) Single.just(ResponseEntity("Username already exists. Please try an other one", HttpStatus.CONFLICT))
            else userService.insert(User(registrationRequest.username, registrationRequest.password)).map { user ->
                ResponseEntity("User was successfully created with the id: ${user.id}", HttpStatus.CREATED)
            }
    
}

@Service
class UserService @Autowired constructor(override val repository: IRxUserRepository) : RxSimpleService<User, UserEntity>(repository) {

    override val converter: EntityConverter<User, UserEntity> = UserEntity.Converter

    fun userExists(username: String): Single<Boolean>
        = repository.existsByUsername(username)

}

abstract class RxSimpleService<T, E>(protected open val repository: RxJava2CrudRepository<E, Long>)  {

    protected abstract val converter: EntityConverter<T, E>

    open fun insert(model: T): Single<T>
        = repository.save(converter.fromModel(model))
            .map(converter::toModel)

    open fun get(id: Long): Maybe<T>
        = repository.findById(id)
            .map(converter::toModel)

    open fun getAll(): Single<ArrayList<T>>
        = repository.findAll()
            .toList()
            .map(converter::toModels)

    open fun delete(model: T): Completable
        = repository.delete(converter.fromModel(model))

}

@Repository
interface IRxUserRepository : RxJava2CrudRepository<UserEntity, Long> {

    @Query("SELECT CASE WHEN EXISTS ( SELECT * FROM ${UserEntity.TABLE_NAME} WHERE username = :username) THEN CAST(1 AS BIT) ELSE CAST(0 AS BIT) END")
    fun existsByUsername(username: String): Single<Boolean>

}

抽象类RxSimpleService（受保护的open val存储库：RxJava2CrudRepository）{
受保护的抽象值转换器：EntityConverter
开放式趣味插页（型号：T）：单张
=repository.save（converter.fromModel（model））
.map（转换器：：toModel）
开放式趣味游戏（id:Long）：也许吧
=repository.findById（id）
.map（转换器：：toModel）
open fun getAll（）：Single
=repository.findAll（）
托利斯先生（）
.map（转换器：：toModels）
打开乐趣删除（型号：T）：可完成
=repository.delete（converter.fromModel（model））
}

7。RxUserRepository:

logging.level.org.springframework.data.r2dbc=DEBUG
spring.datasource.url=jdbc:mysql://localhost:3306/demodb
spring.datasource.username=root
spring.datasource.password=root

@Configuration
@EnableR2dbcRepositories
class DatabaseConfiguration : AbstractR2dbcConfiguration() {

    override fun connectionFactory(): ConnectionFactory
         = ConnectionFactories.get(
                builder().option(DRIVER, "mysql")
                    .option(HOST, "localhost")
                    .option(USER, "root")
                    .option(PASSWORD, "root") 
                    .option(DATABASE, "demodb")
                    .build()
        )


}

@RequestMapping("/register")
@RestController
class RegistrationController @Autowired constructor(private val userService: UserService) {

    @PostMapping
    fun login(@RequestBody registrationRequest: RegistrationRequest): Single<ResponseEntity<String>>
        = userService.userExists(registrationRequest.username)
            .flatMap { exists -> handleUserExistance(exists, registrationRequest) }
    
    private fun handleUserExistance(exists: Boolean, registrationRequest: RegistrationRequest): Single<ResponseEntity<String>> 
        = if (exists) Single.just(ResponseEntity("Username already exists. Please try an other one", HttpStatus.CONFLICT))
            else userService.insert(User(registrationRequest.username, registrationRequest.password)).map { user ->
                ResponseEntity("User was successfully created with the id: ${user.id}", HttpStatus.CREATED)
            }
    
}

@Service
class UserService @Autowired constructor(override val repository: IRxUserRepository) : RxSimpleService<User, UserEntity>(repository) {

    override val converter: EntityConverter<User, UserEntity> = UserEntity.Converter

    fun userExists(username: String): Single<Boolean>
        = repository.existsByUsername(username)

}

abstract class RxSimpleService<T, E>(protected open val repository: RxJava2CrudRepository<E, Long>)  {

    protected abstract val converter: EntityConverter<T, E>

    open fun insert(model: T): Single<T>
        = repository.save(converter.fromModel(model))
            .map(converter::toModel)

    open fun get(id: Long): Maybe<T>
        = repository.findById(id)
            .map(converter::toModel)

    open fun getAll(): Single<ArrayList<T>>
        = repository.findAll()
            .toList()
            .map(converter::toModels)

    open fun delete(model: T): Completable
        = repository.delete(converter.fromModel(model))

}

@Repository
interface IRxUserRepository : RxJava2CrudRepository<UserEntity, Long> {

    @Query("SELECT CASE WHEN EXISTS ( SELECT * FROM ${UserEntity.TABLE_NAME} WHERE username = :username) THEN CAST(1 AS BIT) ELSE CAST(0 AS BIT) END")
    fun existsByUsername(username: String): Single<Boolean>

}

@存储库
接口IRxUserRepository:RxJava2CrudRepository{
@查询（“存在时选择大小写（从${UserEntity.TABLE_NAME}中选择*其中username=：username），然后强制转换（1为位），否则强制转换（0为位）结束”）
有趣的existsByUsername（用户名：字符串）：单个
}

8。最后，这里是我的用户实体

@Table(TABLE_NAME)
data class UserEntity(
        @Id
        val id: Long,
        val username: String,
        val password: String
)  {

        companion object {
            const val TABLE_NAME = "user_entity"
        }

        object Converter : EntityConverter<User, UserEntity> {

            override fun fromModel(model: User): UserEntity
                   = with(model) { UserEntity(id, username, password) }

            override fun toModel(entity: UserEntity): User
                   = with(entity) { User(id, username, password) }

        }
}

@表格（表格名称）
数据类用户实体(
@身份证
val id:Long，
val用户名：String，
val密码：字符串
)  {
伴星{
const val TABLE_NAME=“用户实体”
}
对象转换器：EntityConverter{
覆盖模型（模型：用户）：UserEntity
=具有（模型）{UserEntity（id、用户名、密码）}
覆盖趣味toModel（实体：UserEntity）：用户
=具有（实体）{User（id、用户名、密码）}
}
}

User
和
RegistrationRequest
只是带有用户名和密码的简单对象。
我错过了什么？
如果需要更多代码，请留下评论。
在
应用程序.properties
中，您需要设置
spring.jpa.hibernate.ddl auto
属性

这些选择包括：

validate: validate the schema, makes no changes to the database.
update: update the schema.
create: creates the schema, destroying previous data.
create-drop: drop the schema when the SessionFactory is closed explicitly, typically when the application is stopped.
none: does nothing with the schema, makes no changes to the database

我终于解决了这个错误

对于初学者来说，这些问题很简单，但也很狡猾：

我在URL中使用了
JDBC
，而不是
R2DBC
我使用的是
H2
运行时实现，因此
应为内存数据库中的
H2
我的
连接工厂
不太正确

所以我做了以下几点：

更新了我的
build.gradle
：

增加：
实现（“io.r2dbc:r2dbc池”）
，
实现（“dev.miku:r2dbc-mysql:0.8.1.RELEASE”）
和
runtimeOnly（“mysql:mysql连接器java”）
删除：
runtimeOnly（“io.r2dbc:r2dbc-h2”）

现在看起来是这样的：

{
    "timestamp": "2020-03-22T11:54:43.466+0000",
    "status": 500,
    "error": "Internal Server Error",
    "message": "execute; bad SQL grammar [UPDATE user_entity SET username = $1, password = $2 WHERE user_entity.id = $3]; nested exception is io.r2dbc.spi.R2dbcBadGrammarException: [42102] [42S02] Table \"USER_ENTITY\" not found; SQL statement:\nUPDATE user_entity SET username = $1, password = $2 WHERE user_entity.id = $3 [42102-200]",
    "path": "/register"
}

import org.jetbrains.kotlin.gradle.tasks.KotlinCompile

plugins {
    id("org.springframework.boot") version "2.2.5.RELEASE"
    id("io.spring.dependency-management") version "1.0.9.RELEASE"
    kotlin("jvm") version "1.3.61"
    kotlin("plugin.spring") version "1.3.61"
}

group = "com.tamimattafi.backend"
version = "0.0.1-SNAPSHOT"
java.sourceCompatibility = JavaVersion.VERSION_11

repositories {
    mavenCentral()
    maven(url = "https://repo.spring.io/milestone")
}

dependencies {
    //SPRING BOOT
    implementation("org.springframework.boot:spring-boot-starter-security")
    implementation("org.springframework.boot:spring-boot-starter-web")
    implementation("org.springframework.boot.experimental:spring-boot-starter-data-r2dbc")

    //KOTLIN
    implementation("com.fasterxml.jackson.module:jackson-module-kotlin")
    implementation("org.jetbrains.kotlin:kotlin-reflect")
    implementation("org.jetbrains.kotlin:kotlin-stdlib-jdk8")

    //RX JAVA
    implementation("io.reactivex.rxjava2:rxjava:2.2.0")
    implementation("io.reactivex:rxjava-reactive-streams:1.2.1")

    //MYSQL
    implementation("dev.miku:r2dbc-mysql:0.8.1.RELEASE")
    implementation("io.r2dbc:r2dbc-pool")
    runtimeOnly("mysql:mysql-connector-java")

    //TEST
    testImplementation("org.springframework.boot:spring-boot-starter-test") {
        exclude(group = "org.junit.vintage", module = "junit-vintage-engine")
    }
    testImplementation("org.springframework.security:spring-security-test")
    testImplementation("io.projectreactor:reactor-test")
    testImplementation("org.springframework.boot.experimental:spring-boot-test-autoconfigure-r2dbc")
}

dependencyManagement {
    imports {
        mavenBom("org.springframework.boot.experimental:spring-boot-bom-r2dbc:0.1.0.M3")
    }
}

tasks.withType<Test> {
    useJUnitPlatform()
}

tasks.withType<KotlinCompile> {
    kotlinOptions {
        freeCompilerArgs = listOf("-Xjsr305=strict")
        jvmTarget = "1.8"
    }
}


将我的
数据库配置更新为此（注意，我删除了
@enabler2dbcrespositions
，因为它应该在别处）：


更新了我的
应用程序
类（我将注释带到这里）：

@springboot应用程序
@使能r2dbcrepositions
类演示应用程序
趣味主线（args:Array）{
运行应用程序（*args）
}

现在可以了！我希望有人会发现这个有用的，快乐的编码！您是否手动创建了user_entity表？@shazin是的，正如您在第一个屏幕截图中所看到的，我使用IntelliJ控制台来完成此操作，它在MySQL Workbench和Terminal中做出反应。