优化SQL语句输出，修复处理进度中错误的表输入计数器。

MesETL.App/Services/ETL/MySqlDestination.cs

@@ -64,7 +64,7 @@ public partial class MySqlDestination : IDisposable, IAsyncDisposable
         if (_recordCache.Count == 0)
             return;
 
-        await using var cmd = _conn.CreateCommand();
+        var cmd = _conn.CreateCommand();
         cmd.CommandTimeout = 0;
        
         try
@@ -108,7 +108,7 @@ public partial class MySqlDestination : IDisposable, IAsyncDisposable
 
     public IEnumerable<string> GetExecutionList(IDictionary<string, IList<DataRecord>> tableRecords, int maxAllowPacket)
     {
-        var sb = new StringBuilder("SET AUTOCOMMIT = 1;\n");
+        var sb = new StringBuilder(_options.Value.FlushCount * 128);
         var appendCount = 0;
         foreach (var (tableName, records) in tableRecords)
         {
@@ -117,6 +117,7 @@ public partial class MySqlDestination : IDisposable, IAsyncDisposable
             
             var recordIdx = 0;
             StartBuild:
+            sb.AppendLine("SET AUTOCOMMIT = 0;\n");
             var noCommas = true;
             
             // 标准列顺序，插入时的字段需要按照该顺序排列
@@ -212,7 +213,7 @@ public partial class MySqlDestination : IDisposable, IAsyncDisposable
 
                     TryAddForUpdateSuffix(tableName, sb);
                     sb.Append(';').AppendLine();
-                    sb.Append("SET AUTOCOMMIT = 1;");
+                    sb.Append("COMMIT;");
                     yield return sb.ToString();
                     sb.Clear();
                     goto StartBuild;