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example of converters in Spring Data JDBC
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‎build-all.sh‎

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chmod +x gradlew
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build_gradle_module "spring-data/spring-data-jdbc-converter"
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build_gradle_module "solid"
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build_gradle_module "spring-boot/data-migration/flyway"
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build_gradle_module "reactive"

‎spring-data/spring-data-jdbc-converter/.gitignore‎

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HELP.md
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.gradle
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build/
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!gradle/wrapper/gradle-wrapper.jar
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!**/src/main/**
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!**/src/test/**
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### STS ###
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.apt_generated
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.classpath
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.factorypath
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.project
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.settings
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.springBeans
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.sts4-cache
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### IntelliJ IDEA ###
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.idea
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*.iws
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*.iml
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*.ipr
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out/
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### NetBeans ###
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/nbproject/private/
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/nbbuild/
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/dist/
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/nbdist/
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/.nb-gradle/
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### VS Code ###
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.vscode/

‎spring-data/spring-data-jdbc-converter/build.gradle‎

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plugins {
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id 'org.springframework.boot' version '2.2.5.RELEASE'
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id 'io.spring.dependency-management' version '1.0.9.RELEASE'
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id 'java'
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}
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group = 'com.example'
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version = '0.0.1-SNAPSHOT'
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sourceCompatibility = '1.8'
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repositories {
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mavenCentral()
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}
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dependencies {
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implementation 'org.springframework.boot:spring-boot-starter-data-jdbc'
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testImplementation('org.springframework.boot:spring-boot-starter-test') {
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exclude group: 'org.junit.vintage', module: 'junit-vintage-engine'
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}
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implementation 'org.flywaydb:flyway-core'
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compileOnly 'org.projectlombok:lombok'
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annotationProcessor 'org.projectlombok:lombok'
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runtimeOnly 'com.h2database:h2'
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}
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test {
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useJUnitPlatform()
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}

‎spring-data/spring-data-jdbc-converter/gradle/wrapper/gradle-wrapper.jar‎

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‎spring-data/spring-data-jdbc-converter/gradle/wrapper/gradle-wrapper.properties‎

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distributionBase=GRADLE_USER_HOME
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distributionPath=wrapper/dists
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distributionUrl=https\://services.gradle.org/distributions/gradle-6.0.1-bin.zip
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zipStoreBase=GRADLE_USER_HOME
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zipStorePath=wrapper/dists

‎spring-data/spring-data-jdbc-converter/gradlew‎

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‎spring-data/spring-data-jdbc-converter/gradlew.bat‎

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‎spring-data/spring-data-jdbc-converter/settings.gradle‎

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rootProject.name = 'demo'

‎spring-data/spring-data-jdbc-converter/src/main/java/io/reflectoring/ConverterConfiguration.java‎

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package io.reflectoring;
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import java.util.Arrays;
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import org.springframework.context.annotation.Configuration;
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import org.springframework.core.convert.converter.Converter;
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import org.springframework.data.convert.ReadingConverter;
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import org.springframework.data.convert.WritingConverter;
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import org.springframework.data.jdbc.core.convert.JdbcCustomConversions;
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import org.springframework.data.jdbc.repository.config.AbstractJdbcConfiguration;
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@Configuration
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class ConverterConfiguration extends AbstractJdbcConfiguration {
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@Override
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public JdbcCustomConversions jdbcCustomConversions() {
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return new JdbcCustomConversions(Arrays.asList(
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new UserIdReadingConverter(),
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new UserIdWritingConverter()
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));
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}
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@ReadingConverter
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static class UserIdReadingConverter implements Converter<Long, UserId> {
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@Override
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public UserId convert(Long source) {
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return new UserId(source);
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}
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}
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@WritingConverter
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static class UserIdWritingConverter implements Converter<UserId, Long> {
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@Override
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public Long convert(UserId source) {
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return source.getValue();
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}
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}
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}

‎spring-data/spring-data-jdbc-converter/src/main/java/io/reflectoring/DemoApplication.java‎

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package io.reflectoring;
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import org.springframework.boot.SpringApplication;
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import org.springframework.boot.autoconfigure.SpringBootApplication;
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import org.springframework.data.jdbc.repository.config.EnableJdbcRepositories;
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@SpringBootApplication
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@EnableJdbcRepositories
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public class DemoApplication {
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public static void main(String[] args) {
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SpringApplication.run(DemoApplication.class, args);
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}
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}

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