Converted configuration class for database setup from Java into Kotlin

Author: nixos89

build.gradle.kts

@@ -25,10 +25,15 @@ java.sourceCompatibility = JavaVersion.VERSION_1_8
 
 repositories {
     mavenCentral()
+    jcenter()
 }
 
 dependencies {
     implementation("org.springframework.boot:spring-boot-starter-web")
+    implementation("org.jetbrains.exposed:exposed-core:0.29.1")
+    implementation("org.jetbrains.exposed:exposed-dao:0.29.1")
+    implementation("org.jetbrains.exposed:exposed-jdbc:0.29.1")
+    implementation("org.jetbrains.exposed:exposed-java-time:0.29.1")
     implementation("com.fasterxml.jackson.module:jackson-module-kotlin")
     implementation("org.jetbrains.kotlin:kotlin-reflect")
     implementation("org.jetbrains.kotlin:kotlin-stdlib-jdk8")

src/main/java/org/example/java_kotlin/config/ToDoConfiguration.java

@@ -0,0 +1,36 @@
+package org.example.java_kotlin.config
+
+import org.springframework.boot.context.properties.ConfigurationProperties
+import com.zaxxer.hikari.HikariConfig
+import org.flywaydb.core.Flyway
+import com.zaxxer.hikari.HikariDataSource
+import org.jetbrains.exposed.sql.Database
+import org.springframework.beans.factory.annotation.Value
+import org.springframework.context.annotation.Bean
+import org.springframework.context.annotation.Configuration
+import javax.sql.DataSource
+
+@Configuration
+@ConfigurationProperties("spring.flyway")
+class ToDoConfiguration {
+
+    @Bean
+    fun datasource(
+        @Value("\${spring.datasource.url}") url: String?,
+        @Value("\${spring.datasource.username}") username: String?,
+        @Value("\${spring.datasource.password}") password: String?,
+        @Value("\${spring.datasource.driverClassName}") driver: String?
+    ): DataSource {
+        val config = HikariConfig()
+        val flyway = Flyway.configure().dataSource(url, username, password).load()
+        flyway.migrate()
+        config.jdbcUrl = url
+        config.username = username
+        config.password = password
+        config.driverClassName = driver
+        return HikariDataSource(config)
+    }
+
+    @Bean
+    fun database(dataSource: HikariDataSource): Database = Database.connect(dataSource)
+}