POC - ASP.NET & MYSQL部分

1. ASP.NET 用MYSQL是需要引入MYSQL的包的，这个在VS的TOOLS-> extension manager里可以搜到的

2. 接下来是WEBCONFIG里的配置信息

  <connectionStrings>
  <add name="connStr" connectionString="User Id=root;host=localhost;Database=test;password=1234;" providerName="MySql.Data.MySqlClient"/>
  </connectionStrings>

3.MYSQL C#连接代码

string strConn = ConfigurationManager.ConnectionStrings["connStr"].ConnectionString;
            MySqlConnection myConnection = new MySqlConnection(strConn);
            MySqlCommand myCommand = new MySqlCommand(QUERY, myConnection);
            myConnection.Open();
            MySqlDataReader myDataReader = myCommand.ExecuteReader();
            while (myDataReader.Read() == true)
            {
                myDataReader["字段"].ToString();
            }
            myDataReader.Close();

4. 将XLSX转换成CSV/TXT，然后数据导入MYSQL

load data local infile "d:/sql.txt" into table <table_name> ignore 1 lines;

5.在处理MYSQL数据时遇到的一些问题

　　5.1 按指定顺序排序

order by instr（‘value,value,value,value‘, <字段名>）

　　5.2 需要创建一个日历表来作为辅助表，需要写个procedure

CREATE TABLE `tmpdate` (date varchar(20),amount int(2));
DELIMITER $$
DROP PROCEDURE IF EXISTS zj$$
CREATE PROCEDURE zj(i DATE,j DATE)
BEGIN
WHILE i<=j DO
INSERT INTO `tmpdate` VALUES(i,0);
SET i=i+INTERVAL 1 DAY;
END WHILE;
END$$
DELIMITER ;

call zj(‘2014-03-03‘,‘2015-12-31‘);
select * from `tmpdate`;

　　5.3 C#代码中sql语句中带变量的连接问题，如下param1,是由‘ " +param1 + " ‘ 组成，外单引，内双引。

query = "select * from (select * from tmpdate where NOT EXISTS" +
                     "(select Date from wmissue where Date=tmpdate.Date) union(select " +
                     "Date,count(*) from (select * from wmissue where Customer=‘"+param1+"‘) B group by Date)) A where Date between " +
                     "DATE_SUB(DATE_FORMAT(now(),‘%Y-%m-%d‘),interval 1 week) and DATE_FORMAT(now(),‘%Y-%m-%d‘) order by Date";