diff --git a/src/main/java/com/yanghuanglin/seq/config/GeneratorConfig.java b/src/main/java/com/yanghuanglin/seq/config/GeneratorConfig.java
index 1a2997c..a883688 100644
--- a/src/main/java/com/yanghuanglin/seq/config/GeneratorConfig.java
+++ b/src/main/java/com/yanghuanglin/seq/config/GeneratorConfig.java
@@ -4,7 +4,6 @@ import com.yanghuanglin.seq.enums.DbType;
 
 import javax.sql.DataSource;
 import java.sql.Connection;
-import java.sql.DatabaseMetaData;
 import java.sql.SQLException;
 
 /**
@@ -134,9 +133,8 @@ public class GeneratorConfig {
 
     public DbType getDbType() {
         if (this.dbType == null) {
-            Connection connection = null;
             try {
-                connection = dataSource.getConnection();
+                Connection connection = dataSource.getConnection();
                 String productName = connection.getMetaData().getDatabaseProductName();
                 this.dbType = DbType.of(productName);
             } catch (SQLException e) {
diff --git a/src/main/java/com/yanghuanglin/seq/enums/DbType.java b/src/main/java/com/yanghuanglin/seq/enums/DbType.java
index 6e9882f..6b7b4b3 100644
--- a/src/main/java/com/yanghuanglin/seq/enums/DbType.java
+++ b/src/main/java/com/yanghuanglin/seq/enums/DbType.java
@@ -30,7 +30,7 @@ public enum DbType {
      */
     public static DbType of(String productName) {
         for (DbType value : DbType.values()) {
-            if (value.name().equalsIgnoreCase(productName.replace(" ","_"))) {
+            if (value.name().equalsIgnoreCase(productName.replace(" ", "_"))) {
                 return value;
             }
         }