diff --git a/spring-boot-project/spring-boot-docker-compose/src/dockerTest/java/org/springframework/boot/docker/compose/service/connection/postgres/PostgresJdbcDockerComposeConnectionDetailsFactoryIntegrationTests.java b/spring-boot-project/spring-boot-docker-compose/src/dockerTest/java/org/springframework/boot/docker/compose/service/connection/postgres/PostgresJdbcDockerComposeConnectionDetailsFactoryIntegrationTests.java
index 398bffbc22..0c8f16e9e0 100644
--- a/spring-boot-project/spring-boot-docker-compose/src/dockerTest/java/org/springframework/boot/docker/compose/service/connection/postgres/PostgresJdbcDockerComposeConnectionDetailsFactoryIntegrationTests.java
+++ b/spring-boot-project/spring-boot-docker-compose/src/dockerTest/java/org/springframework/boot/docker/compose/service/connection/postgres/PostgresJdbcDockerComposeConnectionDetailsFactoryIntegrationTests.java
@@ -33,13 +33,16 @@ import static org.assertj.core.api.Assertions.assertThat;
 class PostgresJdbcDockerComposeConnectionDetailsFactoryIntegrationTests {
 
 	@DockerComposeTest(composeFile = "postgres-compose.yaml", image = TestImage.POSTGRESQL)
-	void runCreatesConnectionDetails(JdbcConnectionDetails connectionDetails) {
+	void runCreatesConnectionDetails(JdbcConnectionDetails connectionDetails) throws ClassNotFoundException {
 		assertConnectionDetails(connectionDetails);
+		checkDatabaseAccess(connectionDetails);
 	}
 
 	@DockerComposeTest(composeFile = "postgres-bitnami-compose.yaml", image = TestImage.BITNAMI_POSTGRESQL)
-	void runWithBitnamiImageCreatesConnectionDetails(JdbcConnectionDetails connectionDetails) {
+	void runWithBitnamiImageCreatesConnectionDetails(JdbcConnectionDetails connectionDetails)
+			throws ClassNotFoundException {
 		assertConnectionDetails(connectionDetails);
+		checkDatabaseAccess(connectionDetails);
 	}
 
 	private void assertConnectionDetails(JdbcConnectionDetails connectionDetails) {
diff --git a/spring-boot-project/spring-boot-docker-compose/src/dockerTest/java/org/springframework/boot/docker/compose/service/connection/postgres/PostgresR2dbcDockerComposeConnectionDetailsFactoryIntegrationTests.java b/spring-boot-project/spring-boot-docker-compose/src/dockerTest/java/org/springframework/boot/docker/compose/service/connection/postgres/PostgresR2dbcDockerComposeConnectionDetailsFactoryIntegrationTests.java
index 2c01091b09..d449b024b7 100644
--- a/spring-boot-project/spring-boot-docker-compose/src/dockerTest/java/org/springframework/boot/docker/compose/service/connection/postgres/PostgresR2dbcDockerComposeConnectionDetailsFactoryIntegrationTests.java
+++ b/spring-boot-project/spring-boot-docker-compose/src/dockerTest/java/org/springframework/boot/docker/compose/service/connection/postgres/PostgresR2dbcDockerComposeConnectionDetailsFactoryIntegrationTests.java
@@ -37,11 +37,13 @@ class PostgresR2dbcDockerComposeConnectionDetailsFactoryIntegrationTests {
 	@DockerComposeTest(composeFile = "postgres-compose.yaml", image = TestImage.POSTGRESQL)
 	void runCreatesConnectionDetails(R2dbcConnectionDetails connectionDetails) {
 		assertConnectionDetails(connectionDetails);
+		checkDatabaseAccess(connectionDetails);
 	}
 
 	@DockerComposeTest(composeFile = "postgres-bitnami-compose.yaml", image = TestImage.BITNAMI_POSTGRESQL)
 	void runWithBitnamiImageCreatesConnectionDetails(R2dbcConnectionDetails connectionDetails) {
 		assertConnectionDetails(connectionDetails);
+		checkDatabaseAccess(connectionDetails);
 	}
 
 	private void assertConnectionDetails(R2dbcConnectionDetails connectionDetails) {
diff --git a/spring-boot-project/spring-boot-docker-compose/src/dockerTest/resources/org/springframework/boot/docker/compose/service/connection/postgres/postgres-bitnami-compose.yaml b/spring-boot-project/spring-boot-docker-compose/src/dockerTest/resources/org/springframework/boot/docker/compose/service/connection/postgres/postgres-bitnami-compose.yaml
index cb34245ec1..97eca6b3c8 100644
--- a/spring-boot-project/spring-boot-docker-compose/src/dockerTest/resources/org/springframework/boot/docker/compose/service/connection/postgres/postgres-bitnami-compose.yaml
+++ b/spring-boot-project/spring-boot-docker-compose/src/dockerTest/resources/org/springframework/boot/docker/compose/service/connection/postgres/postgres-bitnami-compose.yaml
@@ -4,6 +4,6 @@ services:
     ports:
       - '5432'
     environment:
-      - 'POSTGRESQL_USER=myuser'
-      - 'POSTGRESQL_DB=mydatabase'
+      - 'POSTGRESQL_USERNAME=myuser'
+      - 'POSTGRESQL_DATABASE=mydatabase'
       - 'POSTGRESQL_PASSWORD=secret'
diff --git a/spring-boot-project/spring-boot-docker-compose/src/main/java/org/springframework/boot/docker/compose/service/connection/postgres/PostgresEnvironment.java b/spring-boot-project/spring-boot-docker-compose/src/main/java/org/springframework/boot/docker/compose/service/connection/postgres/PostgresEnvironment.java
index 4a63bbc0b6..0d560a5302 100644
--- a/spring-boot-project/spring-boot-docker-compose/src/main/java/org/springframework/boot/docker/compose/service/connection/postgres/PostgresEnvironment.java
+++ b/spring-boot-project/spring-boot-docker-compose/src/main/java/org/springframework/boot/docker/compose/service/connection/postgres/PostgresEnvironment.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2024 the original author or authors.
+ * Copyright 2012-2025 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -28,9 +28,18 @@ import org.springframework.util.StringUtils;
  * @author Andy Wilkinson
  * @author Phillip Webb
  * @author Scott Frederick
+ * @author He Zean
  */
 class PostgresEnvironment {
 
+	private static final String[] USERNAME_KEYS = new String[] { "POSTGRES_USER", "POSTGRES_USERNAME",
+			"POSTGRESQL_USER", "POSTGRESQL_USERNAME" };
+
+	private static final String DEFAULT_USERNAME = "postgres";
+
+	private static final String[] DATABASE_KEYS = new String[] { "POSTGRES_DB", "POSTGRES_DATABASE",
+			"POSTGRESQL_DATABASE" };
+
 	private final String username;
 
 	private final String password;
@@ -38,9 +47,18 @@ class PostgresEnvironment {
 	private final String database;
 
 	PostgresEnvironment(Map<String, String> env) {
-		this.username = env.getOrDefault("POSTGRES_USER", env.getOrDefault("POSTGRESQL_USER", "postgres"));
+		this.username = extractUsername(env);
 		this.password = extractPassword(env);
-		this.database = env.getOrDefault("POSTGRES_DB", env.getOrDefault("POSTGRESQL_DB", this.username));
+		this.database = extractDatabase(env);
+	}
+
+	private String extractUsername(Map<String, String> env) {
+		for (String key : USERNAME_KEYS) {
+			if (env.containsKey(key)) {
+				return env.get(key);
+			}
+		}
+		return DEFAULT_USERNAME;
 	}
 
 	private String extractPassword(Map<String, String> env) {
@@ -49,6 +67,15 @@ class PostgresEnvironment {
 		return password;
 	}
 
+	private String extractDatabase(Map<String, String> env) {
+		for (String key : DATABASE_KEYS) {
+			if (env.containsKey(key)) {
+				return env.get(key);
+			}
+		}
+		return this.username;
+	}
+
 	String getUsername() {
 		return this.username;
 	}
diff --git a/spring-boot-project/spring-boot-docker-compose/src/test/java/org/springframework/boot/docker/compose/service/connection/postgres/PostgresEnvironmentTests.java b/spring-boot-project/spring-boot-docker-compose/src/test/java/org/springframework/boot/docker/compose/service/connection/postgres/PostgresEnvironmentTests.java
index 9058c1f11d..7a8e5dab2c 100644
--- a/spring-boot-project/spring-boot-docker-compose/src/test/java/org/springframework/boot/docker/compose/service/connection/postgres/PostgresEnvironmentTests.java
+++ b/spring-boot-project/spring-boot-docker-compose/src/test/java/org/springframework/boot/docker/compose/service/connection/postgres/PostgresEnvironmentTests.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2024 the original author or authors.
+ * Copyright 2012-2025 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -31,6 +31,7 @@ import static org.assertj.core.api.Assertions.assertThatIllegalStateException;
  * @author Andy Wilkinson
  * @author Phillip Webb
  * @author Scott Frederick
+ * @author He Zean
  */
 class PostgresEnvironmentTests {
 
@@ -66,6 +67,20 @@ class PostgresEnvironmentTests {
 		assertThat(environment.getUsername()).isEqualTo("me");
 	}
 
+	@Test
+	void getUsernameWhenHasPostgresUsername() {
+		PostgresEnvironment environment = new PostgresEnvironment(
+				Map.of("POSTGRES_USERNAME", "me", "POSTGRESQL_PASSWORD", "secret"));
+		assertThat(environment.getUsername()).isEqualTo("me");
+	}
+
+	@Test
+	void getUsernameWhenHasPostgresqlUsername() {
+		PostgresEnvironment environment = new PostgresEnvironment(
+				Map.of("POSTGRESQL_USERNAME", "me", "POSTGRESQL_PASSWORD", "secret"));
+		assertThat(environment.getUsername()).isEqualTo("me");
+	}
+
 	@Test
 	void getPasswordWhenHasPostgresPassword() {
 		PostgresEnvironment environment = new PostgresEnvironment(Map.of("POSTGRES_PASSWORD", "secret"));
@@ -104,6 +119,13 @@ class PostgresEnvironmentTests {
 		assertThat(environment.getDatabase()).isEqualTo("me");
 	}
 
+	@Test
+	void getDatabaseWhenNoPostgresqlDatabaseAndPostgresqlUsername() {
+		PostgresEnvironment environment = new PostgresEnvironment(
+				Map.of("POSTGRESQL_USERNAME", "me", "POSTGRESQL_PASSWORD", "secret"));
+		assertThat(environment.getDatabase()).isEqualTo("me");
+	}
+
 	@Test
 	void getDatabaseWhenHasPostgresDb() {
 		PostgresEnvironment environment = new PostgresEnvironment(
@@ -112,9 +134,16 @@ class PostgresEnvironmentTests {
 	}
 
 	@Test
-	void getDatabaseWhenHasPostgresqlDb() {
+	void getDatabaseWhenHasPostgresDatabase() {
 		PostgresEnvironment environment = new PostgresEnvironment(
-				Map.of("POSTGRESQL_DB", "db", "POSTGRESQL_PASSWORD", "secret"));
+				Map.of("POSTGRES_DATABASE", "db", "POSTGRESQL_PASSWORD", "secret"));
+		assertThat(environment.getDatabase()).isEqualTo("db");
+	}
+
+	@Test
+	void getDatabaseWhenHasPostgresqlDatabase() {
+		PostgresEnvironment environment = new PostgresEnvironment(
+				Map.of("POSTGRESQL_DATABASE", "db", "POSTGRESQL_PASSWORD", "secret"));
 		assertThat(environment.getDatabase()).isEqualTo("db");
 	}