fix bugs

Author: VLSMB

spring-ai-alibaba-nl2sql/spring-ai-alibaba-nl2sql-chat/src/main/java/com/alibaba/cloud/ai/config/BaseDefaultConfiguration.java

@@ -39,18 +39,18 @@
 @Configuration(proxyBeanMethods = false)
 public class BaseDefaultConfiguration {
 
-	private static final Logger logger = LoggerFactory.getLogger(Nl2sqlConfiguration.class);
+	private static final Logger logger = LoggerFactory.getLogger(BaseDefaultConfiguration.class);
 
 	private final Accessor dbAccessor;
 
 	private final DbConfig dbConfig;
 
 	private BaseDefaultConfiguration(DbConfig dbConfig, @Qualifier("mysqlAccessor") Accessor mysqlDbAccessor,
 			@Qualifier("h2Accessor") Accessor h2DbAccessor, @Qualifier("postgreAccessor") Accessor postgreDbAccessor) {
-		if (dbConfig.getDialectType().equals("h2")) {
+		if ("h2".equals(dbConfig.getDialectType())) {
 			dbAccessor = h2DbAccessor;
 		}
-		else if (dbConfig.getDialectType().equals("postgre")) {
+		else if ("postgre".equals(dbConfig.getDialectType())) {
 			dbAccessor = postgreDbAccessor;
 		}
 		else {