[BAEL-7421] - Creating Postgres Schema with Liquibase

persistence-modules/liquibase/pom.xml

@@ -4,13 +4,9 @@
     xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
     <artifactId>liquibase</artifactId>
+    <groupId>com.baeldung</groupId>
     <name>liquibase</name>
-
+    <version>0.0.1-SNAPSHOT</version>
-    <parent>
-        <groupId>com.baeldung</groupId>
-        <artifactId>persistence-modules</artifactId>
-        <version>1.0.0-SNAPSHOT</version>
-    </parent>
 
     <dependencies>
         <dependency>
@@ -18,6 +14,38 @@
             <artifactId>mysql-connector-j</artifactId>
             <version>${mysql-connector-java.version}</version>
         </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-web</artifactId>
+            <version>3.2.3</version>
+            <exclusions>
+                <exclusion>
+                    <groupId>org.slf4j</groupId>
+                    <artifactId>slf4j-log4j12</artifactId>
+                </exclusion>
+            </exclusions>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-data-jpa</artifactId>
+            <version>3.2.3</version>
+        </dependency>
+        <dependency>
+            <groupId>org.liquibase</groupId>
+            <artifactId>liquibase-core</artifactId>
+            <version>4.24.0</version>
+        </dependency>
+        <dependency>
+            <groupId>org.postgresql</groupId>
+            <artifactId>postgresql</artifactId>
+            <version>42.6.1</version>
+            <scope>runtime</scope>
+        </dependency>
+        <dependency>
+            <groupId>net.lbruun.springboot</groupId>
+            <artifactId>preliquibase-spring-boot-starter</artifactId>
+            <version>1.5.0</version>
+        </dependency>
     </dependencies>
 
     <build>
@@ -32,12 +60,26 @@
                     <changeLogFile>liquibase/db-changelog.xml</changeLogFile>
                 </configuration>
             </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <configuration>
+                    <release>${maven.compiler.release}</release>
+                    <compilerArgs>--enable-preview</compilerArgs>
+                    <source>${maven.compiler.source.version}</source>
+                    <target>${maven.compiler.target.version}</target>
+                </configuration>
+            </plugin>
         </plugins>
     </build>
 
     <properties>
         <mysql-connector-java.version>8.2.0</mysql-connector-java.version>
         <liquibase-maven-plugin.version>4.25.0</liquibase-maven-plugin.version>
+        <maven.compiler.source.version>17</maven.compiler.source.version>
+        <maven.compiler.target.version>17</maven.compiler.target.version>
+        <maven.compiler.release>17</maven.compiler.release>
+        <java.version>17</java.version>
     </properties>
 
 </project>

persistence-modules/liquibase/src/main/java/com/baeldung/liquibase/LiquibaseCreateSchemaApplication.java

@@ -0,0 +1,12 @@
+package com.baeldung.liquibase;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class LiquibaseCreateSchemaApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(LiquibaseCreateSchemaApplication.class, args);
+    }
+}

persistence-modules/liquibase/src/main/java/com/baeldung/liquibase/configuration/SchemaInitializer.java

@@ -0,0 +1,31 @@
+package com.baeldung.liquibase.configuration;
+
+import org.springframework.beans.BeansException;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.beans.factory.config.BeanPostProcessor;
+
+import javax.sql.DataSource;
+import java.sql.Connection;
+import java.sql.SQLException;
+import java.sql.Statement;
+
+public class SchemaInitializer implements BeanPostProcessor {
+
+    @Value("${spring.liquibase.default-schema}")
+    private String schemaName;
+
+    @Override
+    public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {
+        if (bean instanceof DataSource) {
+            DataSource dataSource = (DataSource) bean;
+            try {
+                Connection conn = dataSource.getConnection();
+                Statement statement = conn.createStatement();
+                statement.execute(String.format("CREATE SCHEMA IF NOT EXISTS %s", schemaName));
+            } catch (SQLException e) {
+                throw new RuntimeException(e);
+            }
+        }
+        return bean;
+    }
+}

persistence-modules/liquibase/src/main/java/com/baeldung/liquibase/entity/User.java

@@ -0,0 +1,30 @@
+package com.baeldung.liquibase.entity;
+
+import jakarta.persistence.Entity;
+import jakarta.persistence.Id;
+import jakarta.persistence.Table;
+
+@Entity
+@Table(name = "users")
+public class User {
+
+    @Id
+    private Long id;
+    private String name;
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+}

persistence-modules/liquibase/src/main/resources/application.properties

@@ -0,0 +1,5 @@
+#spring.datasource.url=jdbc:postgresql://some-postgresql-host/some-postgresql-database
+#spring.datasource.username=your-postgresql-username
+#spring.datasource.password=your-postgresql-password
+#spring.liquibase.change-log=classpath:liquibase/changelog.xml
+#spring.liquibase.default-schema=user_management

persistence-modules/liquibase/src/main/resources/liquibase/changelog.xml

@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="utf-8"?>
+<databaseChangeLog
+        xmlns="http://www.liquibase.org/xml/ns/dbchangelog"
+        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+        xsi:schemaLocation="http://www.liquibase.org/xml/ns/dbchangelog http://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-3.4.xsd">
+
+    <!--    <changeSet id="0" author="unknown">-->
+    <!--        <sql>-->
+    <!--            CREATE SCHEMA IF NOT EXISTS user_management;-->
+    <!--        </sql>-->
+    <!--    </changeSet>-->
+    <changeSet id="1" author="unknown">
+        <!--        <createTable tableName="users" schemaName="user_management">-->
+        <createTable tableName="users">
+            <column name="id" type="bigint">
+                <constraints primaryKey="true" nullable="false"/>
+            </column>
+            <column name="name" type="varchar(255)">
+                <constraints nullable="false"/>
+            </column>
+        </createTable>
+    </changeSet>
+</databaseChangeLog>

persistence-modules/liquibase/src/main/resources/preliquibase/postgresql.sql

@@ -0,0 +1 @@
+CREATE SCHEMA IF NOT EXISTS user_management;