Relocate configuration prefix constant

Relocate DataSourceAutoConfiguration.CONFIGURATION_PREFIX to
DataSourceProperties.PREFIX.

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/jdbc/DataSourceAutoConfiguration.java

@@ -56,8 +56,6 @@ import org.springframework.jdbc.datasource.embedded.EmbeddedDatabaseType;
 @Import(Registrar.class)
 public class DataSourceAutoConfiguration {
 
-	public static final String CONFIGURATION_PREFIX = "spring.datasource";
-
 	/**
 	 * Determines if the {@code dataSource} being used by Spring was created from
 	 * {@link EmbeddedDataSourceConfiguration}.
@@ -99,7 +97,7 @@ public class DataSourceAutoConfiguration {
 		@Autowired
 		private DataSourceProperties properties;
 
-		@ConfigurationProperties(prefix = DataSourceAutoConfiguration.CONFIGURATION_PREFIX)
+		@ConfigurationProperties(prefix = DataSourceProperties.PREFIX)
 		@Bean
 		public DataSource dataSource() {
 			DataSourceBuilder factory = DataSourceBuilder

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/jdbc/DataSourceProperties.java

@@ -31,9 +31,11 @@ import org.springframework.util.StringUtils;
  * @author Maciej Walkowiak
  * @since 1.1.0
  */
-@ConfigurationProperties(prefix = DataSourceAutoConfiguration.CONFIGURATION_PREFIX)
+@ConfigurationProperties(prefix = DataSourceProperties.PREFIX)
 public class DataSourceProperties implements BeanClassLoaderAware, InitializingBean {
 
+	public static final String PREFIX = "spring.datasource";
+
 	private String driverClassName;
 
 	private String url;
@@ -199,7 +201,7 @@ public class DataSourceProperties implements BeanClassLoaderAware, InitializingB
 	}
 
 	public String getSqlScriptEncoding() {
-		return sqlScriptEncoding;
+		return this.sqlScriptEncoding;
 	}
 
 	public void setSqlScriptEncoding(String sqlScriptEncoding) {

spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/jdbc/CommonsDataSourceConfigurationTests.java

@@ -92,7 +92,7 @@ public class CommonsDataSourceConfigurationTests {
 	protected static class CommonsDataSourceConfiguration {
 
 		@Bean
-		@ConfigurationProperties(prefix = DataSourceAutoConfiguration.CONFIGURATION_PREFIX)
+		@ConfigurationProperties(prefix = DataSourceProperties.PREFIX)
 		public DataSource dataSource() {
 			return DataSourceBuilder.create().type(BasicDataSource.class).build();
 		}

spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/jdbc/HikariDataSourceConfigurationTests.java

@@ -103,7 +103,7 @@ public class HikariDataSourceConfigurationTests {
 	protected static class HikariDataSourceConfiguration {
 
 		@Bean
-		@ConfigurationProperties(prefix = DataSourceAutoConfiguration.CONFIGURATION_PREFIX)
+		@ConfigurationProperties(prefix = DataSourceProperties.PREFIX)
 		public DataSource dataSource() {
 			return DataSourceBuilder.create().type(HikariDataSource.class).build();
 		}

spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/jdbc/TomcatDataSourceConfigurationTests.java

@@ -135,7 +135,7 @@ public class TomcatDataSourceConfigurationTests {
 	protected static class TomcatDataSourceConfiguration {
 
 		@Bean
-		@ConfigurationProperties(prefix = DataSourceAutoConfiguration.CONFIGURATION_PREFIX)
+		@ConfigurationProperties(prefix = DataSourceProperties.PREFIX)
 		public DataSource dataSource() {
 			return DataSourceBuilder.create()
 					.type(org.apache.tomcat.jdbc.pool.DataSource.class).build();