fix: add SQL Server to MySQL syntax conversion for parameter placeholders and table names

Automatically convert SQL Server syntax to MySQL-compatible format in
execute_query() and execute_update() methods:

- Parameter placeholders: ? -> %s
- Table names: [dbo].[TableName] -> dbo_TableName
- Column names: [ColumnName] -> ColumnName

This fixes the "Not all parameters were used in the SQL statement" error
that occurred when running queries originally written for SQL Server against
MySQL database.

The conversion is transparent to existing code, allowing SQL queries
throughout the codebase to work with MySQL without modification.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

db/mysql_connection.py

@@ -83,10 +83,14 @@ class MySQLConnection(BaseDatabaseConnection):
         cursor = None
         try:
             cursor = self.connection.cursor(dictionary=True)
+            # Convert SQL Server placeholders (?) to MySQL placeholders (%s)
+            # Convert SQL Server table names to MySQL format
+            converted_sql = self._convert_placeholders(sql)
+            converted_sql = self._convert_table_names(converted_sql)
             if params:
-                cursor.execute(sql, params)
+                cursor.execute(converted_sql, params)
             else:
-                cursor.execute(sql)
+                cursor.execute(converted_sql)
 
             # 直接获取字典列表
             results = cursor.fetchall()
@@ -116,10 +120,14 @@ class MySQLConnection(BaseDatabaseConnection):
         cursor = None
         try:
             cursor = self.connection.cursor()
+            # Convert SQL Server placeholders (?) to MySQL placeholders (%s)
+            # Convert SQL Server table names to MySQL format
+            converted_sql = self._convert_placeholders(sql)
+            converted_sql = self._convert_table_names(converted_sql)
             if params:
-                cursor.execute(sql, params)
+                cursor.execute(converted_sql, params)
             else:
-                cursor.execute(sql)
+                cursor.execute(converted_sql)
 
             self.connection.commit()
             return cursor.rowcount
@@ -132,6 +140,44 @@ class MySQLConnection(BaseDatabaseConnection):
             if cursor:
                 cursor.close()
 
+    def _convert_placeholders(self, sql: str) -> str:
+        """
+        Convert SQL Server placeholders (?) to MySQL placeholders (%s)
+
+        This is necessary because the codebase was originally designed for SQL Server,
+        which uses '?' as parameter placeholders. MySQL uses '%s' instead.
+
+        Args:
+            sql: SQL query with potential SQL Server placeholders
+
+        Returns:
+            str: SQL query with MySQL-compatible placeholders
+        """
+        return sql.replace('?', '%s')
+
+    def _convert_table_names(self, sql: str) -> str:
+        """
+        Convert SQL Server table names to MySQL format
+
+        Converts [dbo].[TableName] to dbo_TableName and removes square brackets
+        from column names.
+
+        Args:
+            sql: SQL query with SQL Server table/column names
+
+        Returns:
+            str: SQL query with MySQL-compatible table/column names
+        """
+        import re
+
+        # Convert [dbo].[TableName] to dbo_TableName
+        sql = re.sub(r'\[dbo\]\.\[([^\]]+)\]', r'dbo_\1', sql)
+
+        # Remove square brackets from column names (e.g., [Column] -> Column)
+        sql = re.sub(r'\[([^\]]+)\]', r'\1', sql)
+
+        return sql
+
     def get_placeholder(self) -> str:
         """
         获取参数占位符