ExportDataToFile/Utility/MySQLUtilityClass.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.IO;
using System.Data;
using System.Data.Sql;
using System.Data.SqlClient;
using System.Configuration;
using MySqlConnector;



namespace ManagementSystem.Utility
{
    public static class MySQLUtility
    {
                
        #region 取得指定Table資料
        public static DataTable GetTable(string strTableName, int intTopCount, string[] strColumnList , string strWhere, string strOrderBy, MySqlConnection sqlConn)
        {
            DataSet dsData = new DataSet();
            string strCommand = "";
            try
            {
                string strColumns = "";
                foreach (string strColumn in strColumnList) //取得欄位陣列
                {
                    if (strColumns != "")
                    {
                        strColumns += "," + strColumn.Trim();
                    }
                    else
                    {
                        strColumns = strColumn;
                    }
                }

                if (intTopCount > 0)
                {
                    strCommand = string.Format("Select {1} From {2} Limit {0}", intTopCount.ToString(), strColumns, strTableName);
                }
                else
                {
                    strCommand = string.Format("Select {0} From {1} ", strColumns, strTableName);
                }

                if (strWhere != "") //設定過濾條件
                {
                    strCommand += " Where " + strWhere;
                }

                if (strOrderBy != "")  //取得排序欄位
                {
                    strCommand += " Order By " + strOrderBy;
                }

                using (MySqlDataAdapter sqlAdapter = new MySqlDataAdapter(strCommand, sqlConn))
                {
                    if (sqlConn.State == ConnectionState.Closed)  //判斷連線狀態
                    {
                        sqlConn.Open();
                    }
                    sqlAdapter.Fill(dsData, "Result");
                }

                if (dsData.Tables.Count != 0)
                {
                    return dsData.Tables["Result"];
                }
                else
                {
                    return null;
                }
            }
            catch (Exception ex)
            {
                return null;
                throw ex;
            }
        }

        public static DataTable GetTable(string strTableName, int intTopCount, string[] strColumnList, string strWhere, MySqlConnection sqlConn)
        {
            return GetTable(strTableName, intTopCount, strColumnList, strWhere, "", sqlConn);
        }

        public static DataTable GetTable(string strTableName, int intTopCount, string[] strColumnList, MySqlConnection sqlConn)
        {
            return GetTable(strTableName, intTopCount, strColumnList,"","", sqlConn);
        }

        public static DataTable GetTable(string strTableName, int intTopCount, MySqlConnection sqlConn)
        {
            return GetTable(strTableName, intTopCount,new string[] {"*"}, "", "", sqlConn);
        }

        public static DataTable GetTable(string strTableName, MySqlConnection sqlConn)
        {
            return GetTable(strTableName, 0, new string[] { "*" }, "", "", sqlConn);
        }


        #endregion

        #region MyQL命令相關程式集
        public static MySqlConnection GetConn(string strIP, string strDBName, string strID, string strPWD, string strPort)
        {
            try
            {
                string strConnectionString = "server=" + strIP + ";port=" + strPort + ";database=" + strDBName + ";user id=" + strID + ";password=" + strPWD + ";charset=utf8;";
                MySqlConnection sqlConn = new MySqlConnection(strConnectionString);
                sqlConn.ConnectionString = strConnectionString;
                sqlConn.Open();
                return sqlConn;
            }
            catch (Exception ex)
            {
                ErrorHandler.WriteErrorLog("MySQLUtilityClass.cs", ex);
                return null;
            }
        }        

        public static DataTable GetSQLResult(string strSQL, MySqlConnection sqlConn)
        {
            DataSet dsData = new DataSet();
            try
            {                
                using (MySqlDataAdapter sqlAdapter = new MySqlDataAdapter(strSQL, sqlConn))
                {
                    if (sqlConn == null)
                        return null;
                    if (sqlConn.State == ConnectionState.Closed)  //判斷連線狀態
                    {
                        sqlConn.Open();
                    }
                    sqlAdapter.Fill(dsData, "Result");
                }

                if (dsData.Tables.Count != 0)
                {
                    return dsData.Tables["Result"];
                }
                else
                {
                    return null;
                }
            }
            catch(Exception ex)
            {
                return null;
                throw ex; 
            }
        }

        public static bool IsExist(string strSQL, MySqlConnection sqlConn)
        {
            try
            {
                DataTable dtResult = GetSQLResult(strSQL, sqlConn);
                if (dtResult.Rows.Count > 0)
                { return true; }
                else
                { return false; }
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

        public static bool RunSQLNonReturn(string strSQL, MySqlConnection sqlConn)
        {
            try
            {
                MySqlCommand sqlCmd = new MySqlCommand(strSQL, sqlConn);
                if (sqlConn.State == ConnectionState.Closed)  //判斷連線狀態
                {
                    sqlConn.Open();
                }
                sqlCmd.ExecuteNonQuery();
                return true;
            }
            catch (Exception ex)
            {
                return false;
            }
        }

        public static string GetSQLCount(string strSQL, MySqlConnection sqlConn)
        {
            string strCount = "";
            DataTable dtTemp = GetSQLResult(strSQL, sqlConn);
            strCount = dtTemp.Rows.Count.ToString();

            //回傳查詢結果
            if(strCount == "")
                { return "0"; }
            else
                { return strCount; }
        }
        #endregion

    }
}