jpa_multiple_databases: 멀티DB 연동 샘플

poc/admin/database/docker-compose.yml

@@ -3,21 +3,20 @@ services:
   mariadb:
     container_name: mariadb
     image: mariadb:10.11.7
-    restart: always
     build:
       context: .
       dockerfile: Dockerfiles
-    ports:
+    command: --init-file /docker-entrypoint-initdb.d/init.sql
-      - 3307:3306
     volumes:
       - data:/var/lib/mysql # named volume
       - ./conf.d:/etc/mysql/conf.d # volume mount
+      - ./init.d:/docker-entrypoint-initdb.d
     environment:
       - TZ=Asia/Seoul
       - MARIADB_ROOT_PASSWORD=root
-      - MARIADB_DATABASE=admin-system
+    ports:
-      - MARIADB_USER=admin
+      - 3307:3306
-      - MARIADB_PASSWORD=1234
+    restart: always
 
 volumes:
     data:

poc/admin/database/init.d/init.sql

@@ -0,0 +1,12 @@
+DROP USER IF EXISTS 'admin';
+CREATE USER 'admin'@'%';
+
+# create databases
+CREATE DATABASE IF NOT EXISTS `admin-system`;
+GRANT ALL ON `admin-system`.* TO 'admin'@'%' IDENTIFIED BY '1234';
+
+CREATE DATABASE IF NOT EXISTS ADMIN_DATABASE;
+GRANT ALL ON ADMIN_DATABASE.* TO 'admin'@'%' IDENTIFIED BY '1234';
+
+CREATE DATABASE IF NOT EXISTS ADMIN_DATABASE_MASTER;
+GRANT ALL ON ADMIN_DATABASE_MASTER.* TO 'admin'@'%' IDENTIFIED BY '1234';

poc/admin/src/main/resources/data.sql

@@ -8,6 +8,11 @@ INSERT INTO `admin` (`login_id`, `password`, `email`, `name`, `role_id`, `create
 VALUES ('admin', '$2a$10$g6UOrQ/OS8o5r5CJk7C5juVFaItQ62U3EIn8zLPzkFplM3wVLvKZ2', 'admin@admin.com', '홍길동', 1, CURDATE(),
         CURDATE());
 
+INSERT INTO `admin` (`login_id`, `password`, `email`, `name`, `role_id`, `create_date`, `update_date`)
+VALUES ('admin1', '$2a$10$gyIn.eVOD/eFY3cCZGnNau3buR4a./BifPPTbJbfgEvvoQiJlnRYG', 'admin@admin.com', '홍길동', 1, CURDATE(),
+        CURDATE());
+
+
 INSERT INTO `menu_group` (`uri`, `name`, `sort_order`, `create_date`, `update_date`)
 VALUES ('/main', '메인', 1, CURDATE(), CURDATE()),
        ('/admin', '관리자 관리', 2, CURDATE(), CURDATE()),

poc/admin/src/main/resources/templates/layout/common.html

@@ -25,7 +25,9 @@
     <div class="container">
         <th:block th:replace="~{layout/lnb :: lnb}"></th:block>
         <div class="content">
-            <th:block layout:fragment="contents"/>
+            <div class="con_wrap">
+                <th:block layout:fragment="contents"/>
+            </div>
         </div>
     </div>
 </main>

poc/jpa_multiple_databases/.gitignore

@@ -0,0 +1,37 @@
+HELP.md
+.gradle
+build/
+!gradle/wrapper/gradle-wrapper.jar
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+bin/
+!**/src/main/**/bin/
+!**/src/test/**/bin/
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+out/
+!**/src/main/**/out/
+!**/src/test/**/out/
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+
+### VS Code ###
+.vscode/

poc/jpa_multiple_databases/build.gradle

@@ -0,0 +1,56 @@
+plugins {
+	id 'java'
+	id 'org.springframework.boot' version '3.2.5'
+	id 'io.spring.dependency-management' version '1.1.4'
+}
+
+group = 'com.bpgroup.poc'
+version = '0.0.1-SNAPSHOT'
+
+java {
+	sourceCompatibility = '17'
+}
+
+configurations {
+	compileOnly {
+		extendsFrom annotationProcessor
+	}
+}
+
+repositories {
+	mavenCentral()
+}
+
+dependencies {
+	// spring
+	implementation 'org.springframework.boot:spring-boot-starter-web'
+	implementation 'org.springframework.boot:spring-boot-starter-data-jpa'
+	implementation 'org.springframework.boot:spring-boot-starter-validation'
+	testImplementation 'org.springframework.boot:spring-boot-starter-test'
+	annotationProcessor "org.springframework.boot:spring-boot-configuration-processor"
+
+	//jpa
+	implementation 'org.springframework.boot:spring-boot-starter-data-jpa'
+
+	//querydsl
+	implementation "com.querydsl:querydsl-jpa:${dependencyManagement.importedProperties['querydsl.version']}:jakarta"
+	annotationProcessor "com.querydsl:querydsl-apt:${dependencyManagement.importedProperties['querydsl.version']}:jakarta"
+	annotationProcessor "jakarta.persistence:jakarta.persistence-api"
+	annotationProcessor "jakarta.annotation:jakarta.annotation-api"
+
+
+	// dev container
+	developmentOnly 'org.springframework.boot:spring-boot-devtools'
+
+	//lombok
+	compileOnly 'org.projectlombok:lombok'
+	annotationProcessor 'org.projectlombok:lombok'
+
+	// db
+	runtimeOnly 'org.mariadb.jdbc:mariadb-java-client'
+
+}
+
+tasks.named('test') {
+	useJUnitPlatform()
+}

poc/jpa_multiple_databases/gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,7 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.7-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

poc/jpa_multiple_databases/gradlew

@@ -0,0 +1,249 @@
+#!/bin/sh
+
+#
+# Copyright © 2015-2021 the original authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+##############################################################################
+#
+#   Gradle start up script for POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/HEAD/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
+##############################################################################
+
+# Attempt to set APP_HOME
+
+# Resolve links: $0 may be a link
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
+done
+
+# This is normally unused
+# shellcheck disable=SC2034
+APP_BASE_NAME=${0##*/}
+# Discard cd standard output in case $CDPATH is set (https://github.com/gradle/gradle/issues/25036)
+APP_HOME=$( cd "${APP_HOME:-./}" > /dev/null && pwd -P ) || exit
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&2
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+} >&2
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD=$JAVA_HOME/jre/sh/java
+    else
+        JAVACMD=$JAVA_HOME/bin/java
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD=java
+    if ! command -v java >/dev/null 2>&1
+    then
+        die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
+    esac
+fi
+
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
+fi
+
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Collect all arguments for the java command:
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,
+#     and any embedded shellness will be escaped.
+#   * For example: A user cannot expect ${Hostname} to be expanded, as it is an environment variable and will be
+#     treated as '${Hostname}' itself on the command line.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -classpath "$CLASSPATH" \
+        org.gradle.wrapper.GradleWrapperMain \
+        "$@"
+
+# Stop when "xargs" is not available.
+if ! command -v xargs >/dev/null 2>&1
+then
+    die "xargs is not available"
+fi
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
+
+exec "$JAVACMD" "$@"

poc/jpa_multiple_databases/gradlew.bat

@@ -0,0 +1,92 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%"=="" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%"=="" set DIRNAME=.
+@rem This is normally unused
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if %ERRORLEVEL% equ 0 goto execute
+
+echo. 1>&2
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo. 1>&2
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if %ERRORLEVEL% equ 0 goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+set EXIT_CODE=%ERRORLEVEL%
+if %EXIT_CODE% equ 0 set EXIT_CODE=1
+if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE%
+exit /b %EXIT_CODE%
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

poc/jpa_multiple_databases/settings.gradle

@@ -0,0 +1 @@
+rootProject.name = 'jpa_multiple_databases'

poc/jpa_multiple_databases/src/main/java/com/bpgroup/poc/jpa_multi_db/ApiResponse.java

@@ -1,4 +1,4 @@
-package com.bpgorup.poc.jpa_sp;
+package com.bpgroup.poc.jpa_multi_db;
 
 import com.fasterxml.jackson.annotation.JsonInclude;
 import lombok.Getter;

poc/jpa_multiple_databases/src/main/java/com/bpgroup/poc/jpa_multi_db/MultipleDbApplication.java

@@ -0,0 +1,13 @@
+package com.bpgroup.poc.jpa_multi_db;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class MultipleDbApplication {
+
+	public static void main(String[] args) {
+		SpringApplication.run(MultipleDbApplication.class, args);
+	}
+
+}

poc/jpa_multiple_databases/src/main/java/com/bpgroup/poc/jpa_multi_db/common/FormatHelper.java

@@ -0,0 +1,29 @@
+package com.bpgroup.poc.jpa_multi_db.common;
+
+import lombok.AccessLevel;
+import lombok.NoArgsConstructor;
+import org.slf4j.helpers.MessageFormatter;
+
+@NoArgsConstructor(access = AccessLevel.PRIVATE)
+public class FormatHelper {
+    /**
+     * Slf4J 스타일로 문자열 포멧팅을 해주는 함수
+     * <p>
+     * Example:
+     * <pre>
+     *     String str1 = FormatHelper.format("{} {} {} {}", "1", 2, 3L, true);
+     *     str1.equals("1 2 3 true");
+     *
+     *     Object[] params = {"1", 2, 3L, true};
+     *     String str2 = FormatHelper.format("{} {} {} {}", params);
+     *     str2.equals("1 2 3 true");
+     * </pre>
+     *
+     * @param pattern 파싱되서 params를 적용해 포맷팅 된 패턴
+     * @param params pattern의 {}에 치환 할 값
+     * @return 포맷팅 된 문자열
+     */
+    public static String format(String pattern, Object... params) {
+        return MessageFormatter.arrayFormat(pattern, params).getMessage();
+    }
+}

poc/jpa_multiple_databases/src/main/java/com/bpgroup/poc/jpa_multi_db/common/SubStringHelper.java

@@ -0,0 +1,17 @@
+package com.bpgroup.poc.jpa_multi_db.common;
+
+import java.nio.charset.StandardCharsets;
+import java.util.Arrays;
+
+public class SubStringHelper {
+
+    public static String substringInBytes(String original, int byteLength) {
+        byte[] bytes = original.getBytes(StandardCharsets.UTF_8);
+        if (bytes.length > byteLength) {
+            bytes = Arrays.copyOf(bytes, byteLength);
+            return new String(bytes, StandardCharsets.UTF_8);
+        }
+        return original;
+    }
+
+}

poc/jpa_multiple_databases/src/main/java/com/bpgroup/poc/jpa_multi_db/config/PrimaryConfig.java

@@ -0,0 +1,64 @@
+package com.bpgroup.poc.jpa_multi_db.config;
+
+import org.springframework.boot.context.properties.ConfigurationProperties;
+import org.springframework.boot.jdbc.DataSourceBuilder;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.Primary;
+import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
+import org.springframework.orm.jpa.JpaTransactionManager;
+import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean;
+import org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter;
+import org.springframework.transaction.PlatformTransactionManager;
+import org.springframework.transaction.annotation.EnableTransactionManagement;
+
+import javax.sql.DataSource;
+import java.util.HashMap;
+
+@Configuration // 설정파일 어노테이션
+@EnableTransactionManagement // 트랜잭션 범위를 활성화 해 주는 어노테이션
+@EnableJpaRepositories(
+        basePackages = "com.bpgroup.poc.jpa_multi_db.domain",
+        entityManagerFactoryRef = "primaryEntityManager",
+        transactionManagerRef = "primaryTransactionManager"
+)
+//@EnableGlobalMethodSecurity(prePostEnabled = true, securedEnabled = true)
+public class PrimaryConfig {
+
+    @Bean
+    @Primary
+    @ConfigurationProperties(prefix = "spring.datasource.hikari.admin")
+    public DataSource primaryDataSource() {
+        return DataSourceBuilder.create().build();
+    }
+
+    @Bean
+    @Primary
+    public LocalContainerEntityManagerFactoryBean primaryEntityManager() {
+        LocalContainerEntityManagerFactoryBean em = new LocalContainerEntityManagerFactoryBean();
+        em.setDataSource(primaryDataSource());
+        em.setPackagesToScan(new String[] {"com.bpgroup.poc.jpa_multi_db.domain"});
+
+        HibernateJpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();
+        vendorAdapter.setShowSql(true);
+        vendorAdapter.setGenerateDdl(true);
+        em.setJpaVendorAdapter(vendorAdapter);
+
+        HashMap<String, Object> prop = new HashMap<>();
+        prop.put("hibernate.dialect", "org.hibernate.dialect.MariaDBDialect");
+        prop.put("hibernate.hbm2ddl.auto", "create-drop");
+        prop.put("hibernate.format_sql", true);
+        em.setJpaPropertyMap(prop);
+
+        return em;
+    }
+
+    @Bean
+    @Primary
+    public PlatformTransactionManager primaryTransactionManager() {
+        JpaTransactionManager transactionManager = new JpaTransactionManager();
+        transactionManager.setEntityManagerFactory(primaryEntityManager().getObject());
+        return transactionManager;
+    }
+
+}

poc/jpa_multiple_databases/src/main/java/com/bpgroup/poc/jpa_multi_db/config/QuerydslConfig.java

@@ -0,0 +1,35 @@
+package com.bpgroup.poc.jpa_multi_db.config;
+
+import com.querydsl.jpa.impl.JPAQueryFactory;
+import jakarta.persistence.EntityManager;
+import jakarta.persistence.PersistenceContext;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+@Configuration
+public class QuerydslConfig {
+
+    /*@PersistenceContext
+    private EntityManager entityManager;
+
+    @Bean
+    public JPAQueryFactory jpaQueryFactory() {
+        return new JPAQueryFactory(entityManager);
+    }*/
+
+    @PersistenceContext(unitName = "primaryEntityManager")
+    private EntityManager primaryEntityManager;
+
+    @PersistenceContext(unitName = "secondEntityManager")
+    private EntityManager secondEntityManager;
+
+    @Bean
+    public JPAQueryFactory firstJpaQueryFactory() {
+        return new JPAQueryFactory(primaryEntityManager);
+    }
+
+    @Bean
+    public JPAQueryFactory secondJpaQueryFactory() {
+        return new JPAQueryFactory(secondEntityManager);
+    }
+}

poc/jpa_multiple_databases/src/main/java/com/bpgroup/poc/jpa_multi_db/config/SecondConfig.java

@@ -0,0 +1,79 @@
+package com.bpgroup.poc.jpa_multi_db.config;
+
+import org.springframework.beans.factory.annotation.Qualifier;
+import org.springframework.boot.context.properties.ConfigurationProperties;
+import org.springframework.boot.jdbc.DataSourceBuilder;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.core.io.ClassPathResource;
+import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
+import org.springframework.jdbc.datasource.init.DataSourceInitializer;
+import org.springframework.jdbc.datasource.init.ResourceDatabasePopulator;
+import org.springframework.orm.jpa.JpaTransactionManager;
+import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean;
+import org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter;
+import org.springframework.transaction.PlatformTransactionManager;
+
+import javax.sql.DataSource;
+import java.util.HashMap;
+
+@Configuration
+@EnableJpaRepositories(
+        basePackages = "com.bpgroup.poc.jpa_multi_db.userdomain",
+        entityManagerFactoryRef = "secondEntityManager",
+        transactionManagerRef = "secondTransactionManager"
+)
+public class SecondConfig {
+
+    @Bean
+    @ConfigurationProperties(prefix = "spring.datasource.hikari.admin-sub")
+    public DataSource secondDataSource() {
+        return DataSourceBuilder.create().build();
+    }
+
+    @Bean
+    public LocalContainerEntityManagerFactoryBean secondEntityManager() {
+        LocalContainerEntityManagerFactoryBean em = new LocalContainerEntityManagerFactoryBean();
+        em.setDataSource(secondDataSource());
+        em.setPackagesToScan(new String[] {"com.bpgroup.poc.jpa_multi_db.userdomain"});
+
+        HibernateJpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();
+        vendorAdapter.setShowSql(true);
+        vendorAdapter.setGenerateDdl(true);
+        em.setJpaVendorAdapter(vendorAdapter);
+
+        HashMap<String, Object> prop = new HashMap<>();
+        prop.put("hibernate.dialect", "org.hibernate.dialect.MariaDBDialect");
+        prop.put("hibernate.hbm2ddl.auto", "create-drop");
+        prop.put("hibernate.format_sql", true);
+        em.setJpaPropertyMap(prop);
+
+        return em;
+    }
+
+    @Bean
+    public PlatformTransactionManager secondTransactionManager() {
+        JpaTransactionManager transactionManager = new JpaTransactionManager();
+        transactionManager.setEntityManagerFactory(secondEntityManager().getObject());
+        return transactionManager;
+    }
+
+    /**
+     * H2 DB 초기화 스크립트 실행을 위한
+     * DataSourceInitializer 정의
+     * @param datasource
+     * @return dataSourceInitializer
+     */
+    @Bean
+    public DataSourceInitializer secondDataSourceInitializer(@Qualifier("secondDataSource") DataSource datasource) {
+        ResourceDatabasePopulator resourceDatabasePopulator = new ResourceDatabasePopulator();
+        resourceDatabasePopulator.addScript(new ClassPathResource("data-sub.sql"));
+
+        DataSourceInitializer dataSourceInitializer = new DataSourceInitializer();
+        dataSourceInitializer.setDataSource(datasource);
+        dataSourceInitializer.setDatabasePopulator(resourceDatabasePopulator);
+        return dataSourceInitializer;
+    }
+
+
+}

poc/jpa_multiple_databases/src/main/java/com/bpgroup/poc/jpa_multi_db/domain/BaseEntity.java

@@ -0,0 +1,22 @@
+package com.bpgroup.poc.jpa_multi_db.domain;
+
+import jakarta.persistence.Column;
+import jakarta.persistence.EntityListeners;
+import jakarta.persistence.MappedSuperclass;
+import org.springframework.data.annotation.CreatedDate;
+import org.springframework.data.annotation.LastModifiedDate;
+import org.springframework.data.jpa.domain.support.AuditingEntityListener;
+
+import java.time.LocalDateTime;
+
+@MappedSuperclass
+@EntityListeners(AuditingEntityListener.class)
+public class BaseEntity {
+    @Column(name = "create_date")
+    @CreatedDate
+    protected LocalDateTime createdDate;
+
+    @Column(name = "update_date")
+    @LastModifiedDate
+    protected LocalDateTime updatedDate;
+}

poc/jpa_multiple_databases/src/main/java/com/bpgroup/poc/jpa_multi_db/domain/DomainException.java

@@ -0,0 +1,7 @@
+package com.bpgroup.poc.jpa_multi_db.domain;
+
+public class DomainException extends RuntimeException {
+    public DomainException(String message) {
+        super(message);
+    }
+}

poc/jpa_multiple_databases/src/main/java/com/bpgroup/poc/jpa_multi_db/domain/admin/entity/Admin.java

@@ -0,0 +1,35 @@
+package com.bpgroup.poc.jpa_multi_db.domain.admin.entity;
+
+import com.bpgroup.poc.jpa_multi_db.domain.BaseEntity;
+import com.bpgroup.poc.jpa_multi_db.userdomain.userInfo.entity.UserInfo;
+import jakarta.persistence.*;
+import lombok.AccessLevel;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+@Getter
+@Entity
+@Table(name = "admin")
+@NoArgsConstructor(access = AccessLevel.PROTECTED) // 생성자를 통해서 값 변경 목적으로 접근하는 메시지들 차단
+public class Admin extends BaseEntity {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+
+    @Column(name = "login_id", length = 100, nullable = false, unique = true)
+    private String loginId;
+
+    @Column(name = "password", length = 255, nullable = false)
+    private String password;
+
+    @Column(name = "email", length = 100, nullable = false)
+    private String email;
+
+    @Column(name = "name", length = 100, nullable = false)
+    private String name;
+
+    /*@OneToOne(mappedBy = "admin")
+    private UserInfo userInfo;*/
+
+}

poc/jpa_multiple_databases/src/main/java/com/bpgroup/poc/jpa_multi_db/domain/admin/entity/AdminRepository.java

@@ -0,0 +1,7 @@
+package com.bpgroup.poc.jpa_multi_db.domain.admin.entity;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface AdminRepository extends JpaRepository<Admin, Long> {
+
+}

poc/jpa_multiple_databases/src/main/java/com/bpgroup/poc/jpa_multi_db/domain/admin/service/AdminService.java

@@ -0,0 +1,17 @@
+package com.bpgroup.poc.jpa_multi_db.domain.admin.service;
+
+import com.bpgroup.poc.jpa_multi_db.domain.admin.entity.AdminRepository;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+import org.springframework.validation.annotation.Validated;
+
+@Service
+@RequiredArgsConstructor
+@Validated
+@Transactional
+public class AdminService {
+
+    private final AdminRepository adminRepository;
+
+}

poc/jpa_multiple_databases/src/main/java/com/bpgroup/poc/jpa_multi_db/userdomain/userInfo/entity/UserInfo.java

@@ -0,0 +1,33 @@
+package com.bpgroup.poc.jpa_multi_db.userdomain.userInfo.entity;
+
+import com.bpgroup.poc.jpa_multi_db.domain.BaseEntity;
+import com.bpgroup.poc.jpa_multi_db.domain.admin.entity.Admin;
+import jakarta.persistence.*;
+import lombok.AccessLevel;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+@Getter
+@Entity
+@Table(name = "user_info")
+@NoArgsConstructor(access = AccessLevel.PROTECTED) // 생성자를 통해서 값 변경 목적으로 접근하는 메시지들 차단
+public class UserInfo extends BaseEntity {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+
+    @Column(name = "user_name", length = 10)
+    private String userName;
+
+    @Column(name = "user_type", length = 10)
+    private String userType;
+
+    @Column(name = "admin_id")
+    private Long adminId;
+
+    /*@OneToOne(fetch = FetchType.LAZY)
+    @JoinColumn(name = "admin_id", foreignKey = @ForeignKey(name = "none"), nullable = false)
+    private Admin admin;*/
+
+}

poc/jpa_multiple_databases/src/main/java/com/bpgroup/poc/jpa_multi_db/userdomain/userInfo/entity/UserInfoRepository.java

@@ -0,0 +1,10 @@
+package com.bpgroup.poc.jpa_multi_db.userdomain.userInfo.entity;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+
+import java.util.Optional;
+
+public interface UserInfoRepository extends JpaRepository<UserInfo, Long> {
+
+    Optional<UserInfo> findByAdminId(Long adminId);
+}

poc/jpa_multiple_databases/src/main/java/com/bpgroup/poc/jpa_multi_db/userdomain/userInfo/service/UserInfoService.java

@@ -0,0 +1,21 @@
+package com.bpgroup.poc.jpa_multi_db.userdomain.userInfo.service;
+
+import com.bpgroup.poc.jpa_multi_db.userdomain.userInfo.entity.UserInfo;
+import com.bpgroup.poc.jpa_multi_db.userdomain.userInfo.entity.UserInfoRepository;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+import org.springframework.validation.annotation.Validated;
+
+import java.util.Optional;
+
+@Service
+@RequiredArgsConstructor
+@Validated
+@Transactional
+public class UserInfoService {
+
+    private final UserInfoRepository userInfoRepository;
+
+    public Optional<UserInfo> findByAdminId(Long adminId) { return userInfoRepository.findByAdminId(adminId);}
+}

poc/jpa_multiple_databases/src/main/java/com/bpgroup/poc/jpa_multi_db/web/MultiDbSampleController.java

@@ -0,0 +1,33 @@
+package com.bpgroup.poc.jpa_multi_db.web;
+
+import com.bpgroup.poc.admin.web.multipledb.reqres.UserInfoFind;
+import com.bpgroup.poc.jpa_multi_db.userdomain.userInfo.entity.UserInfo;
+import lombok.RequiredArgsConstructor;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+@RequiredArgsConstructor
+@RequestMapping("/multiDbSample")
+public class MultiDbSampleController {
+
+    private final MultiDbSampleService multiDbSampleService;
+
+    @GetMapping("/searchMultipleDbTest")
+    public ResponseEntity<?> findUserList(Long adminId){
+        UserInfo response = multiDbSampleService.findUserInfo(adminId);
+
+        return ResponseEntity.ok(response);
+    }
+
+    @GetMapping("/searchMultipleDbJoin")
+    public ResponseEntity<?> findJoinUserList(Long adminId){
+        UserInfoFind.Response response = multiDbSampleService.findJoinUserInfo(adminId);
+
+        return ResponseEntity.ok(response);
+    }
+
+}
+

poc/jpa_multiple_databases/src/main/java/com/bpgroup/poc/jpa_multi_db/web/MultiDbSampleQueryRepository.java

@@ -0,0 +1,44 @@
+package com.bpgroup.poc.jpa_multi_db.web;
+
+import com.bpgroup.poc.admin.web.multipledb.reqres.UserInfoFind;
+import com.bpgroup.poc.jpa_multi_db.userdomain.userInfo.entity.UserInfo;
+import com.querydsl.core.types.Projections;
+import com.querydsl.jpa.impl.JPAQueryFactory;
+import lombok.RequiredArgsConstructor;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Qualifier;
+import org.springframework.stereotype.Repository;
+
+import static com.bpgroup.poc.jpa_multi_db.userdomain.userInfo.entity.QUserInfo.userInfo;
+
+@Repository
+@RequiredArgsConstructor
+public class MultiDbSampleQueryRepository {
+
+    @Autowired
+    @Qualifier("firstJpaQueryFactory")
+    private final JPAQueryFactory firstJpaQueryFactory;
+
+    @Autowired
+    @Qualifier("secondJpaQueryFactory")
+    private final JPAQueryFactory secondJpaQueryFactory;
+
+    public UserInfo findUserInfo(Long adminId){
+        return secondJpaQueryFactory.selectFrom(userInfo)
+                .where(userInfo.adminId.eq(adminId))
+                .fetchOne();
+    }
+
+    /*public UserInfoFind.Response findJoinUserInfo(Long adminId){
+        return secondJpaQueryFactory.select( Projections.fields(
+                    UserInfoFind.Response.class,
+                    userInfo.id,
+                    userInfo.userName,
+                    admin.email
+            )).from(userInfo)
+            .join(admin).on(userInfo.adminId.eq(admin.id))
+            .where(userInfo.adminId.eq(adminId))
+            .fetchOne();
+    }*/
+
+}

poc/jpa_multiple_databases/src/main/java/com/bpgroup/poc/jpa_multi_db/web/MultiDbSampleService.java

@@ -0,0 +1,38 @@
+package com.bpgroup.poc.jpa_multi_db.web;
+
+
+import com.bpgroup.poc.admin.web.multipledb.reqres.UserInfoFind;
+import com.bpgroup.poc.jpa_multi_db.domain.admin.entity.Admin;
+import com.bpgroup.poc.jpa_multi_db.domain.admin.entity.AdminRepository;
+import com.bpgroup.poc.jpa_multi_db.domain.admin.service.AdminService;
+import com.bpgroup.poc.jpa_multi_db.userdomain.userInfo.entity.UserInfo;
+import com.bpgroup.poc.jpa_multi_db.userdomain.userInfo.service.UserInfoService;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+@Service
+@Transactional
+@RequiredArgsConstructor
+public class MultiDbSampleService {
+
+    private final UserInfoService userInfoService;
+
+    private final MultiDbSampleQueryRepository multiDbSampleQueryRepository;
+    private final AdminRepository adminRepository;
+
+    public UserInfo findUserInfo(Long adminId){
+        return userInfoService.findByAdminId(adminId).orElseThrow(() -> new IllegalArgumentException("UserInfo not found"));
+    }
+
+    public UserInfoFind.Response findJoinUserInfo(Long adminId){
+        UserInfo userInfo = multiDbSampleQueryRepository.findUserInfo(adminId);
+        Admin admin = adminRepository.findById(adminId).orElseThrow(() -> new IllegalArgumentException("Admin not found"));
+        return UserInfoFind.Response.builder()
+                .userInfoId(userInfo.getId())
+                .userName(userInfo.getUserName())
+                .email(admin.getEmail())
+                .build();
+
+    }
+}

poc/jpa_multiple_databases/src/main/java/com/bpgroup/poc/jpa_multi_db/web/reqres/UserInfoFind.java

@@ -0,0 +1,17 @@
+package com.bpgroup.poc.admin.web.multipledb.reqres;
+
+import lombok.Builder;
+import lombok.Getter;
+import lombok.ToString;
+
+public class UserInfoFind {
+
+    @Getter
+    @ToString
+    @Builder
+    public static class Response {
+        private Long userInfoId;
+        private String userName;
+        private String email;
+    }
+}

poc/jpa_multiple_databases/src/main/resources/application.yml

@@ -0,0 +1,35 @@
+spring:
+  sql:
+    init:
+      mode: always
+
+  datasource:
+    hikari:
+      admin:
+        jdbc-url: jdbc:mariadb://localhost:3307/ADMIN_DATABASE
+        username: admin
+        password: 1234
+        driver-class-name: org.mariadb.jdbc.Driver
+        data-locations: data.sql
+      admin-sub:
+        jdbc-url: jdbc:mariadb://localhost:3307/ADMIN_DATABASE_MASTER
+        username: admin
+        password: 1234
+        driver-class-name: org.mariadb.jdbc.Driver
+        data-locations: data-sub.sql
+
+  jpa:
+    hibernate.hbm2ddl.auto: create-drop
+    show-sql: true
+    properties:
+      hibernate:
+        format_sql: true
+    #hibernate:
+    #  ddl-auto: create-drop
+    defer-datasource-initialization: true
+
+logging:
+  config: classpath:logback-local.xml
+
+server:
+    port: 8082

poc/jpa_multiple_databases/src/main/resources/data-sub.sql

@@ -0,0 +1,6 @@
+INSERT INTO `user_info` (`user_name`, `user_type`, `admin_id`, `create_date`, `update_date`)
+VALUES ('테스1', '관리자', 1, CURDATE(), CURDATE()),
+       ('테스2', '관리자', 2, CURDATE(), CURDATE());
+
+
+

poc/jpa_multiple_databases/src/main/resources/data.sql

@@ -0,0 +1,13 @@
+
+INSERT INTO `admin` (`login_id`, `password`, `email`, `name`, `create_date`, `update_date`)
+VALUES ('admin', '$2a$10$g6UOrQ/OS8o5r5CJk7C5juVFaItQ62U3EIn8zLPzkFplM3wVLvKZ2', 'admin@admin.com', '홍길동', CURDATE(),
+        CURDATE());
+
+INSERT INTO `admin` (`login_id`, `password`, `email`, `name`, `create_date`, `update_date`)
+VALUES ('admin1', '$2a$10$gyIn.eVOD/eFY3cCZGnNau3buR4a./BifPPTbJbfgEvvoQiJlnRYG', 'admin@admin.com', '홍길동', CURDATE(),
+        CURDATE());
+
+
+
+
+

poc/jpa_multiple_databases/src/main/resources/logback-local.xml

@@ -0,0 +1,24 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<configuration>
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>%5p|%d{yyyy-MM-dd HH:mm:ss.SSS}|%X{loginId}|%32X{sessionId}|%32X{transactionId}|%logger:%line|%msg%n</pattern>
+        </encoder>
+    </appender>
+
+    <root level="DEBUG">
+        <appender-ref ref="STDOUT" />
+    </root>
+
+    <logger name="org.springframework" level="INFO" />
+
+    <logger name="com.zaxxer.hikari" level="INFO" />
+    <logger name="org.mariadb.jdbc.client" level="INFO" />
+    <logger name="org.mariadb.jdbc.message" level="INFO" />
+    <logger name="jdbc" level="OFF" />
+    <logger name="log4jdbc" level="INFO" />
+    <logger name="org.hibernate" level="INFO" />
+    <logger name="org.thymeleaf" level="INFO" />
+
+    <logger name="org.hibernate.orm.jdbc" level="TRACE" />
+</configuration>

poc/jpa_multiple_databases/src/test/java/jpa_multiple_databases/jpa_multi_db/MultipleDbApplicationTests.java

@@ -0,0 +1,11 @@
+package jpa_multiple_databases.jpa_multi_db;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.test.context.ActiveProfiles;
+
+@SpringBootTest
+@ActiveProfiles("test")
+class MultipleDbApplicationTests {
+
+}

poc/jpa_sp_poc/src/test/java/jpa_multiple_databases/jpa_multi_db/JpaSpApplicationTests.java

@@ -1,4 +1,4 @@
-package jpa_sp_poc.jpa_sp;
+package jpa_multiple_databases.jpa_multi_db;
 
 import org.junit.jupiter.api.Test;
 import org.springframework.boot.test.context.SpringBootTest;