diff --git a/src/main/java/com/example/exam/exam/service/mysql/IMysqlLocalServiceImpl.java b/src/main/java/com/example/exam/exam/service/mysql/IMysqlLocalServiceImpl.java
index b292fe6..557fd92 100644
--- a/src/main/java/com/example/exam/exam/service/mysql/IMysqlLocalServiceImpl.java
+++ b/src/main/java/com/example/exam/exam/service/mysql/IMysqlLocalServiceImpl.java
@@ -1009,27 +1009,27 @@ public class IMysqlLocalServiceImpl implements IMysqlLocalService {
 
         try (Connection connstu = DriverManager.getConnection(stuDbUrl, user, password);
              Statement stmtstu = connstu.createStatement()) {
+            if (tNames!=null&&tNames.size()>0){
+                for (String tName : tNames) {
+                    // 校验数据库名格式，防止 SQL 注入
+                    if (!tName.matches("^[a-zA-Z0-9_]+$")) {
+                        System.err.println("非法数据库名，跳过: " + tName);
+                        continue;
+                    }
 
-            for (String tName : tNames) {
-                // 校验数据库名格式，防止 SQL 注入
-                if (!tName.matches("^[a-zA-Z0-9_]+$")) {
-                    System.err.println("非法数据库名，跳过: " + tName);
-                    continue;
-                }
-
-                // 检查数据库是否存在
-                String checkSql = "SELECT SCHEMA_NAME FROM INFORMATION_SCHEMA.SCHEMATA WHERE SCHEMA_NAME = '" + tName + "'";
-                try (ResultSet rs = stmtstu.executeQuery(checkSql)) {
-                    if (rs.next()) {
-                        String dropDbSql = "DROP DATABASE `" + tName + "`";
-                        stmtstu.executeUpdate(dropDbSql);
-                        System.out.println("已删除数据库：" + tName);
-                    } else {
-                        System.out.println("数据库不存在，跳过：" + tName);
+                    // 检查数据库是否存在
+                    String checkSql = "SELECT SCHEMA_NAME FROM INFORMATION_SCHEMA.SCHEMATA WHERE SCHEMA_NAME = '" + tName + "'";
+                    try (ResultSet rs = stmtstu.executeQuery(checkSql)) {
+                        if (rs.next()) {
+                            String dropDbSql = "DROP DATABASE `" + tName + "`";
+                            stmtstu.executeUpdate(dropDbSql);
+                            System.out.println("已删除数据库：" + tName);
+                        } else {
+                            System.out.println("数据库不存在，跳过：" + tName);
+                        }
                     }
                 }
             }
-
         } catch (SQLException e) {
             e.printStackTrace();
             throw new RuntimeException("数据库操作失败", e);