using cd.dapper.extension;
using Dapper;
using learun.util;
using MySql.Data.MySqlClient;
using System;
using System.Collections.Generic;
using System.Data;
using System.Data.Common;
using System.Text;
using System.Threading.Tasks;

namespace learun.database.mysql
{
	/// <summary>
	/// 版 本 EasyCode EC管理后台
	/// Copyright (c) 2019-present EC管理有限公司
	/// 创建人：tobin
	/// 日 期：2019.09.09
	/// 描 述：数据库操作方法实现
	/// </summary>
	public class MySqlDataBase : IDataBase
	{
		private static ISqlAdapter sqlAdapter;

		/// <summary>
		/// 当前使用的数据库链接对象
		/// </summary>
		private DbConnection dbConnection { get; set; }

		/// <summary>
		/// 事务对象
		/// </summary>
		private DbTransaction dbTransaction { get; set; }

		/// <summary>
		/// 构造函数
		/// </summary>
		/// <param name="connString">数据库连接地址</param>
		public MySqlDataBase(string connString)
		{
			sqlAdapter = new MySqlAdapter();
			dbConnection = new MySqlConnection(connString);
		}

		#region 事务

		/// <summary>
		/// 开启事务
		/// </summary>
		/// <returns>The trans.</returns>
		public IDataBase BeginTrans()
		{
			if (dbConnection.State == ConnectionState.Closed)
			{
				dbConnection.Open();
			}
			dbTransaction = dbConnection.BeginTransaction();
			return this;
		}

		/// <summary>
		/// 提交
		/// </summary>
		public void Commit()
		{
			try
			{
				dbTransaction.Commit();
			}
			catch
			{
				throw;
			}
			finally
			{
				this.Close();
			}
		}

		/// <summary>
		/// 把当前操作回滚成未提交状态
		/// </summary>
		public void Rollback()
		{
			try
			{
				dbTransaction.Rollback();
			}
			catch
			{
				throw;
			}
			finally
			{
				this.Close();
			}
		}

		/// <summary>
		/// 关闭连接 内存回收
		/// </summary>
		public void Close()
		{
			if (dbTransaction != null)
			{
				dbTransaction.Dispose();
				dbTransaction = null;
			}
			if (dbConnection != null)
			{
				dbConnection.Close();
				dbConnection.Dispose();
				dbConnection = null;
			}
		}

		#endregion 事务

		#region 执行sql语句

		/// <summary>
		/// 执行sql语句(带参数)
		/// </summary>
		/// <param name="strSql">sql语句</param>
		/// <param name="param">参数</param>
		/// <returns></returns>
		public async Task<int> ExecuteSql(string strSql, object param = null)
		{
			try
			{
				strSql = SqlFormat(strSql);
				var res = await dbConnection.ExecuteAsync(strSql, param, dbTransaction);
				return res;
			}
			catch (Exception ex)
			{
				throw ex;
			}
			finally
			{
				if (dbTransaction == null)
				{
					this.Close();
				}
			}
		}

		#endregion 执行sql语句

		#region 执行存储过程

		/// <summary>
		/// 执行存储过程
		/// </summary>
		/// <param name="procName">存储过程名称</param>
		/// <param name="param">参数</param>
		/// <returns></returns>
		public async Task<int> ExecuteProc(string procName, object param = null)
		{
			try
			{
				var res = await dbConnection.ExecuteAsync(procName, param, dbTransaction, null, CommandType.StoredProcedure);
				return res;
			}
			catch (Exception ex)
			{
				throw ex;
			}
			finally
			{
				if (dbTransaction == null)
				{
					this.Close();
				}
			}
		}

		/// <summary>
		/// 执行存储过程(查询实体数据)
		/// </summary>
		/// <param name="procName">存储过程名称</param>
		/// <param name="param">参数</param>
		/// <returns></returns>
		public async Task<T> ExecuteProc<T>(string procName, object param = null) where T : class
		{
			try
			{
				var res = await dbConnection.QueryFirstAsync<T>(procName, param, dbTransaction, null, CommandType.StoredProcedure);

				return res;
			}
			catch (Exception ex)
			{
				throw ex;
			}
			finally
			{
				if (dbTransaction == null)
				{
					this.Close();
				}
			}
		}

		/// <summary>
		/// 执行存储过程(查询实体数据)
		/// </summary>
		/// <returns></returns>
		/// <param name="procName">存储过程名称.</param>
		/// <param name="param">参数</param>
		public async Task<dynamic> QueryFirstProc(string procName, object param = null)
		{
			try
			{
				var res = await dbConnection.QueryFirstAsync(procName, param, dbTransaction, null, CommandType.StoredProcedure);
				return res;
			}
			catch (Exception ex)
			{
				throw ex;
			}
			finally
			{
				if (dbTransaction == null)
				{
					this.Close();
				}
			}
		}

		/// <summary>
		/// 执行存储过程(获取列表数据)
		/// </summary>
		/// <param name="procName">存储过程名称</param>
		/// <param name="param">参数</param>
		/// <returns></returns>
		public async Task<IEnumerable<T>> QueryProc<T>(string procName, object param = null) where T : class
		{
			try
			{
				var res = await dbConnection.QueryAsync<T>(procName, param, dbTransaction, null, CommandType.StoredProcedure);
				return res;
			}
			catch (Exception ex)
			{
				throw ex;
			}
			finally
			{
				if (dbTransaction == null)
				{
					this.Close();
				}
			}
		}

		/// <summary>
		/// 执行存储过程(获取列表数据)
		/// </summary>
		/// <param name="procName">存储过程名称</param>
		/// <param name="param">参数</param>
		/// <returns></returns>
		public async Task<IEnumerable<dynamic>> QueryProc(string procName, object param = null)
		{
			try
			{
				var res = await dbConnection.QueryAsync(procName, param, dbTransaction, null, CommandType.StoredProcedure);
				return res;
			}
			catch (Exception ex)
			{
				throw ex;
			}
			finally
			{
				if (dbTransaction == null)
				{
					this.Close();
				}
			}
		}

		#endregion 执行存储过程

		#region 对像实体 新增/修改/删除

		/// <summary>
		/// 插入实体数据
		/// </summary>
		/// <typeparam name="T">类型</typeparam>
		/// <param name="entity">实体数据</param>
		/// <returns></returns>
		public async Task<int> Insert<T>(T entity) where T : class
		{
			try
			{
				string sql = SqlHelper.Insert<T>(sqlAdapter);
				var res = await dbConnection.ExecuteAsync(sql, entity, dbTransaction);
				return res;
			}
			catch (Exception ex)
			{
				throw ex;
			}
			finally
			{
				if (dbTransaction == null)
				{
					this.Close();
				}
			}
		}

		/// <summary>
		/// 更新实体数据
		/// </summary>
		/// <returns></returns>
		/// <param name="entity">实体数据</param>
		/// <param name="isOnlyHasValue">是否只更新有值的字段</param>
		/// <typeparam name="T">类型</typeparam>
		public async Task<int> Update<T>(T entity, bool isOnlyHasValue = true) where T : class
		{
			try
			{
				string sql = "";
				if (isOnlyHasValue)
				{
					var args = entity.ToJson().ToJObject();
					List<string> hasNoValueList = new List<string>();
					List<string> nullValueList = new List<string>();
					foreach (var item in args.Properties())
					{
						if (item.Value.Type == Newtonsoft.Json.Linq.JTokenType.Null)
						{
							hasNoValueList.Add(item.Name);
						}
						else if (item.Value.ToString() == "" || item.Value.ToString() == "1000-01-01 00:00:00")
						{
							nullValueList.Add(item.Name);
						}
					}
					sql = SqlHelper.Update<T>(sqlAdapter, hasNoValueList);

					foreach (var item in nullValueList)
					{
						sql = sql.Replace("?" + item, "null");
					}
				}
				else
				{
					sql = SqlHelper.Update<T>(sqlAdapter);
				}
				var res = await dbConnection.ExecuteAsync(sql, entity, dbTransaction);
				return res;
			}
			catch (Exception ex)
			{
				throw ex;
			}
			finally
			{
				if (dbTransaction == null)
				{
					this.Close();
				}
			}
		}

		/// <summary>
		/// 删除实体数据
		/// </summary>
		/// <returns></returns>
		/// <param name="entity">实体数据</param>
		/// <typeparam name="T">类型</typeparam>
		public async Task<int> Delete<T>(T entity) where T : class
		{
			try
			{
				string sql = SqlHelper.Delete<T>(sqlAdapter);
				var res = await dbConnection.ExecuteAsync(sql, entity, dbTransaction);
				return res;
			}
			catch (Exception ex)
			{
				throw ex;
			}
			finally
			{
				if (dbTransaction == null)
				{
					this.Close();
				}
			}
		}

		/// <summary>
		/// 删除数据根据给定的字段值
		/// </summary>
		/// <returns></returns>
		/// <param name="param">参数</param>
		/// <typeparam name="T">类型</typeparam>
		public async Task<int> DeleteAny<T>(object param) where T : class
		{
			try
			{
				if (param == null)
				{
					param = new { };
				}
				var jparam = param.ToJson().ToJObject();
				List<string> fields = new List<string>();
				foreach (var item in jparam.Properties())
				{
					if (!string.IsNullOrEmpty(item.Value.ToString()))
					{
						fields.Add(item.Name);
					}
				}
				string sql = SqlHelper.Delete<T>(sqlAdapter, fields);
				var res = await dbConnection.ExecuteAsync(sql, param, dbTransaction);

				return res;
			}
			catch (Exception ex)
			{
				throw ex;
			}
			finally
			{
				if (dbTransaction == null)
				{
					this.Close();
				}
			}
		}

		#endregion 对像实体 新增/修改/删除

		#region 对象实体查询

		/// <summary>
		/// 获取单个实体数据
		/// </summary>
		/// <returns>单个实体数据</returns>
		/// <param name="keyValue">主键</param>
		/// <typeparam name="T">类</typeparam>
		public async Task<T> FindEntityByKey<T>(object keyValue) where T : class
		{
			try
			{
				string sql = SqlHelper.Select<T>(sqlAdapter);
				sql = SqlFormat(sql);
				var res = await dbConnection.QueryFirstOrDefaultAsync<T>(sql, new { id = keyValue }, dbTransaction);
				return res;
			}
			catch (Exception ex)
			{
				throw ex;
			}
			finally
			{
				if (dbTransaction == null)
				{
					this.Close();
				}
			}
		}

		/// <summary>
		/// 获取单个实体数据
		/// </summary>
		/// <returns>单个实体数据</returns>
		/// <param name="sql">sql语句</param>
		/// <param name="param">参数</param>
		/// <typeparam name="T">类</typeparam>
		public async Task<T> FindEntity<T>(string sql, object param = null) where T : class
		{
			try
			{
				sql = SqlFormat(sql);
				var res = await dbConnection.QueryFirstOrDefaultAsync<T>(sql, param, dbTransaction);
				return res;
			}
			catch (Exception ex)
			{
				throw ex;
			}
			finally
			{
				if (dbTransaction == null)
				{
					this.Close();
				}
			}
		}

		/// <summary>
		/// 获取单个实体数据
		/// </summary>
		/// <returns>单个实体数据</returns>
		/// <param name="param">参数</param>
		/// <typeparam name="T">类</typeparam>
		public async Task<T> FindEntity<T>(object param) where T : class
		{
			try
			{
				if (param == null)
				{
					param = new { };
				}
				string sql = SqlHelper.SelectAll<T>(sqlAdapter) + " where 1=1 ";
				var jparam = param.ToJson().ToJObject();
				foreach (var item in jparam.Properties())
				{
					if (!string.IsNullOrEmpty(item.Value.ToString()))
					{
						sql += " AND " + item.Name + "=?" + item.Name;
					}
				}

				sql = SqlFormat(sql);
				var res = await dbConnection.QueryFirstOrDefaultAsync<T>(sql, param, dbTransaction);
				return res;
			}
			catch (Exception ex)
			{
				throw ex;
			}
			finally
			{
				if (dbTransaction == null)
				{
					this.Close();
				}
			}
		}

		/// <summary>
		/// 获取单个实体数据
		/// </summary>
		/// <returns>单个实体数据</returns>
		/// <param name="sql">sql语句.</param>
		/// <param name="param">参数.</param>
		public async Task<dynamic> FindEntity(string sql, object param = null)
		{
			try
			{
				sql = SqlFormat(sql);
				var res = await dbConnection.QueryFirstOrDefaultAsync(sql, param, dbTransaction);
				return res;
			}
			catch (Exception ex)
			{
				throw ex;
			}
			finally
			{
				if (dbTransaction == null)
				{
					this.Close();
				}
			}
		}

		/// <summary>
		/// 获取数据列表
		/// </summary>
		/// <returns>列表数据</returns>
		/// <param name="sql">sql语句.</param>
		/// <param name="param">参数.</param>
		/// <typeparam name="T">类型.</typeparam>
		public async Task<IEnumerable<T>> FindList<T>(string sql, object param = null) where T : class
		{
			try
			{
				sql = SqlFormat(sql);
				var res = await dbConnection.QueryAsync<T>(sql, param, dbTransaction);
				return res;
			}
			catch (Exception ex)
			{
				throw ex;
			}
			finally
			{
				if (dbTransaction == null)
				{
					this.Close();
				}
			}
		}

		/// <summary>
		/// 获取数据列表
		/// </summary>
		/// <returns>列表数据</returns>
		/// <param name="param">参数.</param>
		/// <typeparam name="T">类型.</typeparam>
		public async Task<IEnumerable<T>> FindList<T>(object param) where T : class
		{
			try
			{
				if (param == null)
				{
					param = new { };
				}
				string sql = SqlHelper.SelectAll<T>(sqlAdapter) + " where 1=1 ";
				var jparam = param.ToJson().ToJObject();
				foreach (var item in jparam.Properties())
				{
					if (!string.IsNullOrEmpty(item.Value.ToString()))
					{
						sql += " AND " + item.Name + "=@" + item.Name;
					}
				}

				sql = SqlFormat(sql);
				var res = await dbConnection.QueryAsync<T>(sql, param, dbTransaction);
				return res;
			}
			catch (Exception ex)
			{
				throw ex;
			}
			finally
			{
				if (dbTransaction == null)
				{
					this.Close();
				}
			}
		}

		/// <summary>
		/// 获取数据列表
		/// </summary>
		/// <returns>列表数据</returns>
		/// <param name="sql">sql语句.</param>
		/// <param name="param">参数.</param>
		public async Task<IEnumerable<dynamic>> FindList(string sql, object param = null)
		{
			try
			{
				sql = SqlFormat(sql);
				var res = await dbConnection.QueryAsync(sql, param, dbTransaction);
				return res;
			}
			catch (Exception ex)
			{
				throw ex;
			}
			finally
			{
				if (dbTransaction == null)
				{
					this.Close();
				}
			}
		}

		/// <summary>
		/// 获取数据列表（分页）
		/// </summary>
		/// <returns>列表数据</returns>
		/// <param name="sql">sql语句</param>
		/// <param name="param">参数</param>
		/// <param name="orderField">排序字段</param>
		/// <param name="isAsc">排序类型</param>
		/// <param name="pageSize">每页数据条数</param>
		/// <param name="pageIndex">页码</param>
		/// <typeparam name="T">类</typeparam>
		public async Task<(IEnumerable<T> list, int total)> FindList<T>(string sql, object param, string orderField, bool isAsc, int pageSize, int pageIndex) where T : class
		{
			try
			{
				sql = SqlFormat(sql);
				StringBuilder sb = new StringBuilder();
				sb.Append(GetPageSql(sql, orderField, isAsc, pageSize, pageIndex));
				var resTotal = await dbConnection.ExecuteScalarAsync("Select Count(1) From (" + sql + ") As t", param, dbTransaction);
				int total = Convert.ToInt32(resTotal);
				var list = await dbConnection.QueryAsync<T>(sb.ToString(), param, dbTransaction);
				return (list, total);
			}
			catch (Exception ex)
			{
				throw ex;
			}
			finally
			{
				if (dbTransaction == null)
				{
					this.Close();
				}
			}
		}

		/// <summary>
		/// 获取数据列表（分页）
		/// </summary>
		/// <typeparam name="T">类</typeparam>
		/// <param name="sql">sql语句</param>
		/// <param name="param">参数</param>
		/// <param name="pagination">分页参数</param>
		/// <returns></returns>
		public async Task<IEnumerable<T>> FindList<T>(string sql, object param, Pagination pagination) where T : class
		{
			bool isAsc = true && (string.IsNullOrEmpty(pagination.sord) || pagination.sord.ToUpper() == "ASC");
			var (list, total) = await FindList<T>(sql, param, pagination.sidx, isAsc, pagination.rows, pagination.page);
			pagination.records = total;
			return list;
		}

		/// <summary>
		/// 获取数据列表（分页）
		/// </summary>
		/// <returns>列表数据</returns>
		/// <param name="sql">sql语句</param>
		/// <param name="param">参数</param>
		/// <param name="orderField">排序字段</param>
		/// <param name="isAsc">排序类型</param>
		/// <param name="pageSize">每页数据条数</param>
		/// <param name="pageIndex">页码</param>
		public async Task<(IEnumerable<dynamic> list, int total)> FindList(string sql, object param, string orderField, bool isAsc, int pageSize, int pageIndex)
		{
			try
			{
				sql = SqlFormat(sql);
				StringBuilder sb = new StringBuilder();
				sb.Append(GetPageSql(sql, orderField, isAsc, pageSize, pageIndex));
				var resTotal = await dbConnection.ExecuteScalarAsync("Select Count(1) From (" + sql + ") As t", param, dbTransaction);
				int total = Convert.ToInt32(resTotal);
				var list = await dbConnection.QueryAsync(sb.ToString(), param, dbTransaction);
				return (list, total);
			}
			catch (Exception ex)
			{
				throw ex;
			}
			finally
			{
				if (dbTransaction == null)
				{
					this.Close();
				}
			}
		}

		/// <summary>
		/// 获取数据列表（分页）
		/// </summary>
		/// <param name="sql">sql语句</param>
		/// <param name="param">参数</param>
		/// <param name="pagination">分页参数</param>
		/// <returns></returns>
		public async Task<IEnumerable<dynamic>> FindList(string sql, object param, Pagination pagination)
		{
			bool isAsc = true && (string.IsNullOrEmpty(pagination.sord) || pagination.sord.ToUpper() == "ASC");
			var (list, total) = await FindList(sql, param, pagination.sidx, isAsc, pagination.rows, pagination.page);
			pagination.records = total;
			return list;
		}

		/// <summary>
		/// 获取表的所有数据
		/// </summary>
		/// <returns>列表数据</returns>
		/// <typeparam name="T">类</typeparam>
		public async Task<IEnumerable<T>> FindAll<T>() where T : class
		{
			try
			{
				string sql = SqlHelper.SelectAll<T>(sqlAdapter);
				var res = await dbConnection.QueryAsync<T>(sql, null, dbTransaction);
				return res;
			}
			catch (Exception ex)
			{
				throw ex;
			}
			finally
			{
				if (dbTransaction == null)
				{
					this.Close();
				}
			}
		}

		#endregion 对象实体查询

		#region 数据源查询

		/// <summary>
		/// 查询方法，返回datatable
		/// </summary>
		/// <returns>datatable数据</returns>
		/// <param name="sql">sql语句</param>
		/// <param name="param">参数</param>
		public async Task<DataTable> FindTable(string sql, object param = null)
		{
			try
			{
				sql = SqlFormat(sql);
				var IDataReader = await dbConnection.ExecuteReaderAsync(sql, param, dbTransaction);
				var dt = DBCommonHelper.IDataReaderToDataTable(IDataReader);
				IDataReader.Dispose();
				return dt;
			}
			catch (Exception ex)
			{
				throw ex;
			}
			finally
			{
				if (dbTransaction == null)
				{
					this.Close();
				}
			}
		}

		/// <summary>
		/// 分页查询方法，返回datatable
		/// </summary>
		/// <returns>datatable数据</returns>
		/// <param name="sql">sql语句</param>
		/// <param name="param">参数</param>
		/// <param name="orderField">排序字段</param>
		/// <param name="isAsc">排序类型</param>
		/// <param name="pageSize">每页数据条数</param>
		/// <param name="pageIndex">页码</param>
		public async Task<(DataTable list, int total)> FindTable(string sql, object param, string orderField, bool isAsc, int pageSize, int pageIndex)
		{
			try
			{
				sql = SqlFormat(sql);
				StringBuilder sb = new StringBuilder();
				sb.Append(GetPageSql(sql, orderField, isAsc, pageSize, pageIndex));
				int total = Convert.ToInt32(await dbConnection.ExecuteScalarAsync("Select Count(1) From (" + sql + ") As t", param, dbTransaction));
				var IDataReader = await dbConnection.ExecuteReaderAsync(sb.ToString(), param, dbTransaction);
				var dt = DBCommonHelper.IDataReaderToDataTable(IDataReader);
				IDataReader.Dispose();
				return (dt, total);
			}
			catch (Exception ex)
			{
				throw ex;
			}
			finally
			{
				if (dbTransaction == null)
				{
					this.Close();
				}
			}
		}

		/// <summary>
		/// 分页查询方法，返回datatable
		/// </summary>
		/// <param name="sql">sql语句</param>
		/// <param name="param">参数</param>
		/// <param name="pagination">分页参数</param>
		/// <returns></returns>
		public async Task<DataTable> FindTable(string sql, object param, Pagination pagination)
		{
			bool isAsc = true && (string.IsNullOrEmpty(pagination.sord) || pagination.sord.ToUpper() == "ASC");
			var (list, total) = await FindTable(sql, param, pagination.sidx, isAsc, pagination.rows, pagination.page);
			pagination.records = total;
			return list;
		}

		#endregion 数据源查询

		#region 获取数据库表信息

		/// <summary>
		/// 获取数据库表信息
		/// </summary>
		/// <returns>数据库表信息</returns>
		public async Task<IEnumerable<dynamic>> GetDataBaseTable()
		{
			try
			{
				StringBuilder strSql = new StringBuilder();
				strSql.Append(@"
                            SELECT t1.*,
                                (select COLUMN_NAME from information_schema.`COLUMNS` where TABLE_SCHEMA=database() and  TABLE_NAME =t1.name and COLUMN_KEY='PRI') pk
                                 from (
                                SELECT TABLE_NAME name,0 reserved,0 data,0 index_size,TABLE_ROWS sumrows,0 unused, (select IF(LENGTH(TRIM(TABLE_COMMENT))<1,TABLE_NAME,TABLE_COMMENT)) tdescription
                                from information_schema.`TABLES` where TABLE_SCHEMA =database()
                                ) t1 ORDER BY t1.name
                            ");
				var res = await dbConnection.QueryAsync(strSql.ToString(), null, dbTransaction);
				return res;
			}
			catch (Exception ex)
			{
				throw ex;
			}
			finally
			{
				if (dbTransaction == null)
				{
					this.Close();
				}
			}
		}

		/// <summary>
		/// 获取表的字段信息
		/// </summary>
		/// <returns>表的字段信息</returns>
		/// <param name="tableName">表名</param>
		public async Task<IEnumerable<dynamic>> GetDataBaseTableFields(string tableName)
		{
			try
			{
				StringBuilder strSql = new StringBuilder();
				strSql.Append(@" select  ORDINAL_POSITION f_number, COLUMN_NAME f_column, DATA_TYPE f_datatype, if(CHARACTER_MAXIMUM_LENGTH is null,if(LOCATE('int',column_type)>0,REPLACE(REPLACE(column_type,'int(',''),')',''),0),CHARACTER_MAXIMUM_LENGTH) f_length, '' f_identity, IF(COLUMN_KEY='PRI','1','') f_key,
                                        IF(IS_NULLABLE='YES','1','') f_isnullable,COLUMN_DEFAULT f_default,case when COLUMN_COMMENT='' then COLUMN_NAME else COLUMN_COMMENT END    f_remark from (
                                        select  *
                                         from information_schema.`COLUMNS` t1 where TABLE_SCHEMA=database() and TABLE_NAME = ?tableName
                                        ) t2 order by f_number ");
				var res = await dbConnection.QueryAsync(strSql.ToString(), new { tableName }, dbTransaction);
				return res;
			}
			catch (Exception ex)
			{
				throw ex;
			}
			finally
			{
				if (dbTransaction == null)
				{
					this.Close();
				}
			}
		}

		/// <summary>
		/// 获取数据库地址信息
		/// </summary>
		/// <returns>数据库地址信息</returns>
		public string GetDataSource()
		{
			try
			{
				return dbConnection.DataSource;
			}
			catch (Exception ex)
			{
				throw ex;
			}
			finally
			{
				if (dbTransaction == null)
				{
					this.Close();
				}
			}
		}

		/// <summary>
		/// 测试数据库是否能链接成功
		/// </summary>
		/// <returns>The connection.</returns>
		public string TestConnection()
		{
			try
			{
				BeginTrans();
				Commit();
				return "success";
			}
			catch (Exception ex)
			{
				return ex.Message;
			}
			finally
			{
				if (dbTransaction == null)
				{
					this.Close();
				}
			}
		}

		/// <summary>
		/// 获取sql语句的字段
		/// </summary>
		/// <param name="strSql">sql语句</param>
		/// <returns></returns>
		public async Task<IEnumerable<string>> GetSqlColName(string strSql)
		{
			try
			{
				DataTable dt = null;
				strSql = "select * from(" + strSql + ")t limit 1";
				var IDataReader = await dbConnection.ExecuteReaderAsync(strSql, null, dbTransaction);
				dt = DBCommonHelper.IDataReaderToDataTable(IDataReader);

				List<string> res = new List<string>();
				foreach (DataColumn item in dt.Columns)
				{
					res.Add(item.ColumnName);
				}
				return res;
			}
			catch (Exception ex)
			{
				throw ex;
			}
			finally
			{
				if (dbTransaction == null)
				{
					this.Close();
				}
			}
		}

		#endregion 获取数据库表信息

		#region 私有方法

		/// <summary>
		/// 获取分页语句
		/// </summary>
		/// <returns></returns>
		/// <param name="strSql">sql语句</param>
		/// <param name="orderField">排序字段</param>
		/// <param name="isAsc">是否是升序</param>
		/// <param name="pageSize">每一页大小</param>
		/// <param name="pageIndex">页码</param>
		private string GetPageSql(string strSql, string orderField, bool isAsc, int pageSize, int pageIndex)
		{
			StringBuilder sb = new StringBuilder();
			if (pageIndex == 0)
			{
				pageIndex = 1;
			}
			int num = (pageIndex - 1) * pageSize;
			string OrderBy = "";

			if (!string.IsNullOrEmpty(orderField))
			{
				if (orderField.ToUpper().IndexOf("ASC", StringComparison.Ordinal) + orderField.ToUpper().IndexOf("DESC", StringComparison.Ordinal) > 0)
				{
					OrderBy = " Order By " + orderField;
				}
				else
				{
					OrderBy = " Order By " + orderField + " " + (isAsc ? "ASC" : "DESC");
				}
			}
			sb.Append(strSql + OrderBy);
			sb.Append(" limit " + num + "," + pageSize + "");
			return sb.ToString();
		}

		/// <summary>
		/// 格式化sql语句
		/// </summary>
		/// <param name="strSql">sql语句</param>
		/// <returns>sql语句</returns>
		private string SqlFormat(string strSql)
		{
			return strSql.Replace("@", "?");
		}

		#endregion 私有方法
	}
}