Ktor数据库连接问题！！！我只是不明白为什么 ktor 看不到 application.conf jbdc 的路径
Problems with database connection Ktor!!! I just don't understand why the ktor not to see the path of application.conf jbdc
我的网络项目有问题。这是我第一次尝试连接数据库。我想连接数据库以查看它是否正常工作。我使用 Postgres 并建立了一个数据库。我想使用以下代码进行连接：
Data base settings
package com.testreftul
import com.testreftul.model.Orders
import com.testreftul.model.Products
import com.testreftul.model.User
import com.typesafe.config.ConfigFactory
import io.ktor.server.config.*
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.withContext
import org.jetbrains.exposed.sql.Database
import org.jetbrains.exposed.sql.SchemaUtils
import org.jetbrains.exposed.sql.transactions.transaction
object DbSettings {
private val appConfig = HoconApplicationConfig(ConfigFactory.load())
private var dbUrl = appConfig.property("jbdc.url").getString()
private var dbUser = appConfig.property("jbdc.username").getString()
private var dbPassword = appConfig.property("jbdc.password").getString()
fun init(dbUrl: String, dbUser: String, dbPassword: String) {
this.dbUrl = dbUrl
this.dbUser = dbUser
this.dbPassword = dbPassword
pgConnection()
transaction {
SchemaUtils.create(User, Products, Orders)
}
}
private fun pgConnection() = Database.connect(
url = dbUrl,
driver = "org.postgresql.Driver",
user = dbUser,
password = dbPassword
)
suspend fun <T> dbQuery(block:()->T): T =
withContext(Dispatchers.IO){
transaction {
block()
}
}
}
Database plugin
package com.testreftul.plugins
import com.testreftul.DbSettings
import io.ktor.server.application.*
fun Application.connectDatabase(){
val url = environment.config.property("jdbc.url").getString()
val username = environment.config.property("jdbc.username").getString()
val password = environment.config.property("jdbc.password").getString()
DbSettings.init(url,username,password)
}
Application.conf
ktor {
deployment {
port = 8080
port = ${?PORT}
}
application {
modules = [ com.testreftul.ApplicationKt.module ]
}
}
jdbc{
url = "jdbc:postgresql://localhost:5432/restest"
username = "postgres"
password = "admin"
}
build.gradle.kts
val ktor_version: String by project
val kotlin_version: String by project
val logback_version: String by project
val exposed_version:String by project
val postgresql_jdbc:String by project
plugins {
application
kotlin("jvm") version "1.6.20"
id("org.jetbrains.kotlin.plugin.serialization") version "1.6.20"
}
group = "com.testreftul"
version = "0.0.1"
application {
mainClass.set("io.ktor.server.netty.EngineMain")
val isDevelopment: Boolean = project.ext.has("development")
applicationDefaultJvmArgs = listOf("-Dio.ktor.development=$isDevelopment")
}
repositories {
mavenCentral()
maven { url = uri("https://maven.pkg.jetbrains.space/public/p/ktor/eap") }
}
dependencies {
implementation("io.ktor:ktor-server-core-jvm:$ktor_version")
implementation("io.ktor:ktor-server-content-negotiation-jvm:$ktor_version")
implementation("io.ktor:ktor-serialization-kotlinx-json-jvm:$ktor_version")
implementation("io.ktor:ktor-server-netty-jvm:$ktor_version")
implementation("ch.qos.logback:logback-classic:$logback_version")
implementation ("org.jetbrains.exposed:exposed-core:$exposed_version")
implementation ("org.jetbrains.exposed:exposed-dao:$exposed_version")
implementation ("org.jetbrains.exposed:exposed-jdbc:$exposed_version")
implementation ("org.jetbrains.exposed:exposed-java-time:$exposed_version")
implementation ("org.postgresql:postgresql:$postgresql_jdbc")
testImplementation("io.ktor:ktor-server-tests-jvm:$ktor_version")
testImplementation("org.jetbrains.kotlin:kotlin-test-junit:$kotlin_version")
}
gradle.properties
ktor_version=2.0.0-beta-1
kotlin_version=1.6.20
logback_version=1.2.3
kotlin.code.style=official
exposed_version=0.37.3
postgresql_jdbc=42.3.3
Application.kt
package com.testreftul
import io.ktor.server.application.*
import com.testreftul.plugins.*
fun main(args: Array<String>): Unit =
io.ktor.server.netty.EngineMain.main(args)
@Suppress("unused") // application.conf references the main function. This annotation prevents the IDE from marking it as unused.
fun Application.module() {
connectDatabase()
configureRouting()
configureSerialization()
}
我安装了所有需要的插件并创建了一个数据库，我还配置了我的 ide 并使用方言 postgres.When 连接到数据库 运行 控制台 return 原因：io.ktor.server.config.ApplicationConfigurationException：属性 jbdc.url 未找到。
> Task :run FAILED
2022-04-06 01:55:22.805 [main] TRACE Application - {
# application.conf @ file:/C:/Users/eljan/IdeaProjects/ktor-restful1/build/resources/main/application.conf: 6
"application" : {
# application.conf @ file:/C:/Users/eljan/IdeaProjects/ktor-restful1/build/resources/main/application.conf: 7
"modules" : [
# application.conf @ file:/C:/Users/eljan/IdeaProjects/ktor-restful1/build/resources/main/application.conf: 7
"com.testreftul.ApplicationKt.module"
]
},
# application.conf @ file:/C:/Users/eljan/IdeaProjects/ktor-restful1/build/resources/main/application.conf: 2
"deployment" : {
# application.conf @ file:/C:/Users/eljan/IdeaProjects/ktor-restful1/build/resources/main/application.conf: 3
"port" : 8080
},
# Content hidden
"security" : "***"
}
2022-04-06 01:55:22.976 [main] INFO Application - Autoreload is disabled because the development mode is off.
Exception in thread "main" java.lang.ExceptionInInitializerError
at com.testreftul.plugins.DatabaseKt.connectDatabase(Database.kt:11)
at com.testreftul.ApplicationKt.module(Application.kt:11)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:78)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:567)
at kotlin.reflect.jvm.internal.calls.CallerImpl$Method.callMethod(CallerImpl.kt:97)
at kotlin.reflect.jvm.internal.calls.CallerImpl$Method$Static.call(CallerImpl.kt:106)
at kotlin.reflect.jvm.internal.KCallableImpl.call(KCallableImpl.kt:108)
at kotlin.reflect.jvm.internal.KCallableImpl.callDefaultMethod$kotlin_reflection(KCallableImpl.kt:159)
at kotlin.reflect.jvm.internal.KCallableImpl.callBy(KCallableImpl.kt:112)
at io.ktor.server.engine.internal.CallableUtilsKt.callFunctionWithInjection(CallableUtils.kt:119)
at io.ktor.server.engine.internal.CallableUtilsKt.executeModuleFunction(CallableUtils.kt:36)
at io.ktor.server.engine.ApplicationEngineEnvironmentReloading$launchModuleByName.invoke(ApplicationEngineEnvironmentReloading.kt:333)
at io.ktor.server.engine.ApplicationEngineEnvironmentReloading$launchModuleByName.invoke(ApplicationEngineEnvironmentReloading.kt:332)
at io.ktor.server.engine.ApplicationEngineEnvironmentReloading.avoidingDoubleStartupFor(ApplicationEngineEnvironmentReloading.kt:357)
at io.ktor.server.engine.ApplicationEngineEnvironmentReloading.launchModuleByName(ApplicationEngineEnvironmentReloading.kt:332)
at io.ktor.server.engine.ApplicationEngineEnvironmentReloading.access$launchModuleByName(ApplicationEngineEnvironmentReloading.kt:32)
at io.ktor.server.engine.ApplicationEngineEnvironmentReloading$instantiateAndConfigureApplication.invoke(ApplicationEngineEnvironmentReloading.kt:313)
at io.ktor.server.engine.ApplicationEngineEnvironmentReloading$instantiateAndConfigureApplication.invoke(ApplicationEngineEnvironmentReloading.kt:311)
at io.ktor.server.engine.ApplicationEngineEnvironmentReloading.avoidingDoubleStartup(ApplicationEngineEnvironmentReloading.kt:339)
at io.ktor.server.engine.ApplicationEngineEnvironmentReloading.instantiateAndConfigureApplication(ApplicationEngineEnvironmentReloading.kt:311)
at io.ktor.server.engine.ApplicationEngineEnvironmentReloading.createApplication(ApplicationEngineEnvironmentReloading.kt:144)
at io.ktor.server.engine.ApplicationEngineEnvironmentReloading.start(ApplicationEngineEnvironmentReloading.kt:278)
at io.ktor.server.netty.NettyApplicationEngine.start(NettyApplicationEngine.kt:183)
at io.ktor.server.netty.EngineMain.main(EngineMain.kt:26)
Caused by: io.ktor.server.config.ApplicationConfigurationException: Property jbdc.url not found.
at io.ktor.server.config.HoconApplicationConfig.property(HoconApplicationConfig.kt:15)
at com.testreftul.DbSettings.<clinit>(DbSettings.kt:16)
... 26 more
Caused by: io.ktor.server.config.ApplicationConfigurationException: Property jbdc.url not found.
Execution failed for task ':run'.
> Process 'command 'C:\Users\eljan\.jdks\corretto-16.0.2\bin\java.exe'' finished with non-zero exit value 1
* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.
您在私有变量默认值定义中的配置 属性 名称中有错字。应该是 jdbc 而不是 jbdc:
private var dbUrl = appConfig.property("jbdc.url").getString()
private var dbUser = appConfig.property("jbdc.username").getString()
private var dbPassword = appConfig.property("jbdc.password").getString()
我的网络项目有问题。这是我第一次尝试连接数据库。我想连接数据库以查看它是否正常工作。我使用 Postgres 并建立了一个数据库。我想使用以下代码进行连接：
Data base settings
package com.testreftul
import com.testreftul.model.Orders
import com.testreftul.model.Products
import com.testreftul.model.User
import com.typesafe.config.ConfigFactory
import io.ktor.server.config.*
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.withContext
import org.jetbrains.exposed.sql.Database
import org.jetbrains.exposed.sql.SchemaUtils
import org.jetbrains.exposed.sql.transactions.transaction
object DbSettings {
private val appConfig = HoconApplicationConfig(ConfigFactory.load())
private var dbUrl = appConfig.property("jbdc.url").getString()
private var dbUser = appConfig.property("jbdc.username").getString()
private var dbPassword = appConfig.property("jbdc.password").getString()
fun init(dbUrl: String, dbUser: String, dbPassword: String) {
this.dbUrl = dbUrl
this.dbUser = dbUser
this.dbPassword = dbPassword
pgConnection()
transaction {
SchemaUtils.create(User, Products, Orders)
}
}
private fun pgConnection() = Database.connect(
url = dbUrl,
driver = "org.postgresql.Driver",
user = dbUser,
password = dbPassword
)
suspend fun <T> dbQuery(block:()->T): T =
withContext(Dispatchers.IO){
transaction {
block()
}
}
}
Database plugin
package com.testreftul.plugins
import com.testreftul.DbSettings
import io.ktor.server.application.*
fun Application.connectDatabase(){
val url = environment.config.property("jdbc.url").getString()
val username = environment.config.property("jdbc.username").getString()
val password = environment.config.property("jdbc.password").getString()
DbSettings.init(url,username,password)
}
Application.conf
ktor {
deployment {
port = 8080
port = ${?PORT}
}
application {
modules = [ com.testreftul.ApplicationKt.module ]
}
}
jdbc{
url = "jdbc:postgresql://localhost:5432/restest"
username = "postgres"
password = "admin"
}
build.gradle.kts
val ktor_version: String by project
val kotlin_version: String by project
val logback_version: String by project
val exposed_version:String by project
val postgresql_jdbc:String by project
plugins {
application
kotlin("jvm") version "1.6.20"
id("org.jetbrains.kotlin.plugin.serialization") version "1.6.20"
}
group = "com.testreftul"
version = "0.0.1"
application {
mainClass.set("io.ktor.server.netty.EngineMain")
val isDevelopment: Boolean = project.ext.has("development")
applicationDefaultJvmArgs = listOf("-Dio.ktor.development=$isDevelopment")
}
repositories {
mavenCentral()
maven { url = uri("https://maven.pkg.jetbrains.space/public/p/ktor/eap") }
}
dependencies {
implementation("io.ktor:ktor-server-core-jvm:$ktor_version")
implementation("io.ktor:ktor-server-content-negotiation-jvm:$ktor_version")
implementation("io.ktor:ktor-serialization-kotlinx-json-jvm:$ktor_version")
implementation("io.ktor:ktor-server-netty-jvm:$ktor_version")
implementation("ch.qos.logback:logback-classic:$logback_version")
implementation ("org.jetbrains.exposed:exposed-core:$exposed_version")
implementation ("org.jetbrains.exposed:exposed-dao:$exposed_version")
implementation ("org.jetbrains.exposed:exposed-jdbc:$exposed_version")
implementation ("org.jetbrains.exposed:exposed-java-time:$exposed_version")
implementation ("org.postgresql:postgresql:$postgresql_jdbc")
testImplementation("io.ktor:ktor-server-tests-jvm:$ktor_version")
testImplementation("org.jetbrains.kotlin:kotlin-test-junit:$kotlin_version")
}
gradle.properties
ktor_version=2.0.0-beta-1
kotlin_version=1.6.20
logback_version=1.2.3
kotlin.code.style=official
exposed_version=0.37.3
postgresql_jdbc=42.3.3
Application.kt
package com.testreftul
import io.ktor.server.application.*
import com.testreftul.plugins.*
fun main(args: Array<String>): Unit =
io.ktor.server.netty.EngineMain.main(args)
@Suppress("unused") // application.conf references the main function. This annotation prevents the IDE from marking it as unused.
fun Application.module() {
connectDatabase()
configureRouting()
configureSerialization()
}
我安装了所有需要的插件并创建了一个数据库，我还配置了我的 ide 并使用方言 postgres.When 连接到数据库 运行 控制台 return 原因：io.ktor.server.config.ApplicationConfigurationException：属性 jbdc.url 未找到。
> Task :run FAILED
2022-04-06 01:55:22.805 [main] TRACE Application - {
# application.conf @ file:/C:/Users/eljan/IdeaProjects/ktor-restful1/build/resources/main/application.conf: 6
"application" : {
# application.conf @ file:/C:/Users/eljan/IdeaProjects/ktor-restful1/build/resources/main/application.conf: 7
"modules" : [
# application.conf @ file:/C:/Users/eljan/IdeaProjects/ktor-restful1/build/resources/main/application.conf: 7
"com.testreftul.ApplicationKt.module"
]
},
# application.conf @ file:/C:/Users/eljan/IdeaProjects/ktor-restful1/build/resources/main/application.conf: 2
"deployment" : {
# application.conf @ file:/C:/Users/eljan/IdeaProjects/ktor-restful1/build/resources/main/application.conf: 3
"port" : 8080
},
# Content hidden
"security" : "***"
}
2022-04-06 01:55:22.976 [main] INFO Application - Autoreload is disabled because the development mode is off.
Exception in thread "main" java.lang.ExceptionInInitializerError
at com.testreftul.plugins.DatabaseKt.connectDatabase(Database.kt:11)
at com.testreftul.ApplicationKt.module(Application.kt:11)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:78)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:567)
at kotlin.reflect.jvm.internal.calls.CallerImpl$Method.callMethod(CallerImpl.kt:97)
at kotlin.reflect.jvm.internal.calls.CallerImpl$Method$Static.call(CallerImpl.kt:106)
at kotlin.reflect.jvm.internal.KCallableImpl.call(KCallableImpl.kt:108)
at kotlin.reflect.jvm.internal.KCallableImpl.callDefaultMethod$kotlin_reflection(KCallableImpl.kt:159)
at kotlin.reflect.jvm.internal.KCallableImpl.callBy(KCallableImpl.kt:112)
at io.ktor.server.engine.internal.CallableUtilsKt.callFunctionWithInjection(CallableUtils.kt:119)
at io.ktor.server.engine.internal.CallableUtilsKt.executeModuleFunction(CallableUtils.kt:36)
at io.ktor.server.engine.ApplicationEngineEnvironmentReloading$launchModuleByName.invoke(ApplicationEngineEnvironmentReloading.kt:333)
at io.ktor.server.engine.ApplicationEngineEnvironmentReloading$launchModuleByName.invoke(ApplicationEngineEnvironmentReloading.kt:332)
at io.ktor.server.engine.ApplicationEngineEnvironmentReloading.avoidingDoubleStartupFor(ApplicationEngineEnvironmentReloading.kt:357)
at io.ktor.server.engine.ApplicationEngineEnvironmentReloading.launchModuleByName(ApplicationEngineEnvironmentReloading.kt:332)
at io.ktor.server.engine.ApplicationEngineEnvironmentReloading.access$launchModuleByName(ApplicationEngineEnvironmentReloading.kt:32)
at io.ktor.server.engine.ApplicationEngineEnvironmentReloading$instantiateAndConfigureApplication.invoke(ApplicationEngineEnvironmentReloading.kt:313)
at io.ktor.server.engine.ApplicationEngineEnvironmentReloading$instantiateAndConfigureApplication.invoke(ApplicationEngineEnvironmentReloading.kt:311)
at io.ktor.server.engine.ApplicationEngineEnvironmentReloading.avoidingDoubleStartup(ApplicationEngineEnvironmentReloading.kt:339)
at io.ktor.server.engine.ApplicationEngineEnvironmentReloading.instantiateAndConfigureApplication(ApplicationEngineEnvironmentReloading.kt:311)
at io.ktor.server.engine.ApplicationEngineEnvironmentReloading.createApplication(ApplicationEngineEnvironmentReloading.kt:144)
at io.ktor.server.engine.ApplicationEngineEnvironmentReloading.start(ApplicationEngineEnvironmentReloading.kt:278)
at io.ktor.server.netty.NettyApplicationEngine.start(NettyApplicationEngine.kt:183)
at io.ktor.server.netty.EngineMain.main(EngineMain.kt:26)
Caused by: io.ktor.server.config.ApplicationConfigurationException: Property jbdc.url not found.
at io.ktor.server.config.HoconApplicationConfig.property(HoconApplicationConfig.kt:15)
at com.testreftul.DbSettings.<clinit>(DbSettings.kt:16)
... 26 more
Caused by: io.ktor.server.config.ApplicationConfigurationException: Property jbdc.url not found.
Execution failed for task ':run'.
> Process 'command 'C:\Users\eljan\.jdks\corretto-16.0.2\bin\java.exe'' finished with non-zero exit value 1
* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.
您在私有变量默认值定义中的配置 属性 名称中有错字。应该是 jdbc 而不是 jbdc:
private var dbUrl = appConfig.property("jbdc.url").getString()
private var dbUser = appConfig.property("jbdc.username").getString()
private var dbPassword = appConfig.property("jbdc.password").getString()