mysql

问题 I'm using MySQLdb under Python32 on Windows 7: Python 3.2.3 (default, Apr 11 2012, 07:12:16) [MSC v.1500 64 bit (AMD64)] on win32 >>> import MySQLdb as My >>> My.version_info (1, 2, 3, 'final', 0) I'm running service which calls this many times over and over and over again: cursor = self._connection._conn.cursor() cursor.execute(sql) for i in cursor.fetchall(): pass # Operation that is not important cursor.close() gc.collect() return set() # Will be filled with DB data And memory usage just

问题 I'm using MySQLdb under Python32 on Windows 7: Python 3.2.3 (default, Apr 11 2012, 07:12:16) [MSC v.1500 64 bit (AMD64)] on win32 >>> import MySQLdb as My >>> My.version_info (1, 2, 3, 'final', 0) I'm running service which calls this many times over and over and over again: cursor = self._connection._conn.cursor() cursor.execute(sql) for i in cursor.fetchall(): pass # Operation that is not important cursor.close() gc.collect() return set() # Will be filled with DB data And memory usage just

问题 Hello I try to connect F# and MySQL database, but i got fallowing error :error FS0039: The namespace or module 'MySql' is not defined. So far,i tried to reference the folder which contains MySQL.Data.dll:project -> add reference->browse -> C:\Program Files (x86)\MySQL\MySQL Connector Net 6.3.6\Assemblies\v2.0 Also i tired to reference MySQL.Data,too. But each time,i get this error. Thanks for your help. Regards, 回答1: The F# interactive window is unaware of your project references, so you need

问题 I want get the the average time between start-time and end-time and Where CUR-Time GroupBY user-name i written the sql in laravel it's showing some error i can't find what's that because i'm new to that laravel please help to fix this sql error i submit the my sql and the error message. $avagTime = DB::table( 'active_user' ) ->select(DB::raw('AVG(TIME_TO_SEC(acu_et) - TIME_TO_SEC(acu_at))')) ->where (DATE('acu_at') == ('CURDATE()')) ->get();[![enter image description here][1]][1] 回答1: Try

问题 I want get the the average time between start-time and end-time and Where CUR-Time GroupBY user-name i written the sql in laravel it's showing some error i can't find what's that because i'm new to that laravel please help to fix this sql error i submit the my sql and the error message. $avagTime = DB::table( 'active_user' ) ->select(DB::raw('AVG(TIME_TO_SEC(acu_et) - TIME_TO_SEC(acu_at))')) ->where (DATE('acu_at') == ('CURDATE()')) ->get();[![enter image description here][1]][1] 回答1: Try

问题 I'm storing responses from the google geocoded into my database. One such response has an accent mark over the o. The town is Rincon. (I would put the accent mark here to show you, but I don't know how.) When the response is stored into my mySQL database it looks like this: Rincón I realize that this has to do with Collation, but I'm nervous about making changes to the database because I have so much data in there. The Collation that is currently applied to this field is utf8_general_ci. Can

问题 First of all,English is not my mother language,if I made some mistakes,please forgive me. This problem occurs when I try to push my data from mysql5.7 to Redis,it is about MySQL operation concat . Without the UNION ALL ,and I split it into 2 SQLs,it works.But once I run it with UNION ALL ', the error occurs. [Err] 1271 - Illegal mix of collations for operation concat SELECT CONCAT( "*4\r\n", '$',LENGTH(redis_cmd),'\r\n',redis_cmd,'\r\n', '$',LENGTH(redis_key),'\r\n',redis_key,'\r\n', '$'

问题 When I try to connect a MySQL database directly with JDBC on Android, I got the Exception like this: Caused by: java.lang.ClassNotFoundException: Didn't find class "java.sql.SQLType" on path: DexPathList[[zip file "/system/framework/org.apache.http.legacy.boot.jar",... and my test code is here: package com.kurosei.app.test; import android.os.Bundle; import android.support.v7.app.AppCompatActivity; import java.sql.Connection; import java.sql.DriverManager; import java.sql.SQLException; public

问题 I'm trying to write a MySQL SELECT statement in PHP. I have 2 tables, sales and sale_items . sales has columns: sale_id , status sale_items has columns: sale_id , date_added (DATETIME), quantity I need to return the quantities from sale_items , over the last 12 months grouped by month and where the status of the corresponding row in sales is equal to 'completed' (as you can see, sales and sale_items can be joined by sale_id ). I have tried modifying both of the following to suit my needs, but

问题 I watched one tutorial on youtube about database normalization. The table looks like this: |Item(PK) | Supplier | Supplier Phone | Price| --------------------------------------------- | Xbox One| Microsoft| 1234 | 250 | --------------------------------------------- | PS4 | Sony | 4321 | 300 | --------------------------------------------- | PS Vista| Sony | 4321 | 400 | --------------------------------------------- According to the tutorial this table is in 2NF and every column depends on the