添加项目文件。

src/BarCode.Web.Repositories/MySqlDataAccess.cs

@@ -0,0 +1,68 @@
+using System;
+using System.Collections.Generic;
+using System.Data;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using MySqlConnector;
+namespace BarCode.Web.Repositories
+{
+    public class MySqlDataAccess
+    {
+        private readonly string _connectionString;
+
+        public MySqlDataAccess(string connectionString)
+        {
+            _connectionString = connectionString;
+        }
+
+        /// <summary>
+        /// 执行查询并返回 DataTable
+        /// </summary>
+        /// <param name="query">SQL 查询语句</param>
+        /// <returns>查询结果的 DataTable</returns>
+        public DataTable ExecuteQuery(string query)
+        {
+            using (MySqlConnection connection = new MySqlConnection(_connectionString))
+            {
+                try
+                {
+                    connection.Open();
+                    MySqlCommand command = new MySqlCommand(query, connection);
+                    MySqlDataAdapter adapter = new MySqlDataAdapter(command);
+                    DataTable dataTable = new DataTable();
+                    adapter.Fill(dataTable);
+                    return dataTable;
+                }
+                catch (Exception ex)
+                {
+                    Console.WriteLine($"查询出错: {ex.Message}");
+                    return null;
+                }
+            }
+        }
+
+        /// <summary>
+        /// 执行非查询操作（如 INSERT、UPDATE、DELETE）
+        /// </summary>
+        /// <param name="query">SQL 非查询语句</param>
+        /// <returns>受影响的行数</returns>
+        public int ExecuteNonQuery(string query)
+        {
+            using (MySqlConnection connection = new MySqlConnection(_connectionString))
+            {
+                try
+                {
+                    connection.Open();
+                    MySqlCommand command = new MySqlCommand(query, connection);
+                    return command.ExecuteNonQuery();
+                }
+                catch (Exception ex)
+                {
+                    Console.WriteLine($"执行非查询操作出错: {ex.Message}");
+                    return -1;
+                }
+            }
+        }
+    }
+}