我想在我的游戏服务器上使用MySQL向多个用户发送消息。在此过程中,多个重复字符串(MediumText,100~500个字符)数据将保存在同一列中。
预计100 k用户将收到邮件。
示例(在CSV中):
ID,Item,Content,(SentDate,Expdate)
123148223598230,"{Crystal:100}","Sorry for the inconvenience...blahblah"
133124124515435,"{Crystal:100}","Sorry for the inconvenience.
我希望从我的表people (MySQL)中选择数据,但仅在好友不为空的情况下:
$sql = "SELECT * FROM people WHERE friend = '$friend' ORDER BY id ASC AND WHERE friend IS NOT NULL;" ;
我试着把它写成这样,但没有用。在这种情况下,它没有选择任何东西。
我有一个自定义日期(动态构建/输入),如'2013-5-13‘
但我的mysql数据库存储为'2013-05-13‘
所以我试着像这样把它检索出来
SELECT * FROM TBL WHERE XDATE='2013-5-13' >>> it return me ZERO result
但
SELECT * FROM TBL WHERE XDATE='2013-05-13' >>> it return me CORRECT result
那么如何在mysql语句中直接解决这个问题呢?
由于spring引导升级到spring 2.1.6,我在数据库中计数了一个spring批处理异常:
Caused by: com.mysql.cj.jdbc.exceptions.MysqlDataTruncation: Data truncation: Data too long for column 'SERIALIZED_CONTEXT' at row 1
at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:104)
at com
我目前正在使用Windows PC上的本地MAMP设置来连接到MySQL数据库。但是运行下面的代码会抛出错误。
代码:
$connection = mysqli_connect($host, $user, $pass, $dbname);
错误:
Warning: mysqli_connect(): Headers and client library minor version mismatch. Headers:50541 Library:50634 in C:\MAMP\htdocs\mysql.php on line 14
检查我的phpinfo,版本实际上是不同的。我不确定这个错误是
我正在尝试安装bugzilla3。我以前安装了mysql-server-5.1,它给出了以下错误:
Aborting downgrade from (at least) 5.1 to 5.0.
dpkg: error processing /var/cache/apt/archives/mysql-server-5.0_5.1.30really5.0.75-0ubuntu10.2_i386.deb (--unpack):
subprocess pre-installation script returned error exit status 1
Errors were encountered
我有以下(mysql) SQL查询:
select a.id, a.name, count(*) as humans
from humans h1, areas a
where h1.gender = 'Female' and h1.area_id = a.id
group by area_id
having count(*) > (
select count(*)
from humans h2
where h2.gender = 'Male' and h1.area_id = h2.area_id
group by are
我需要用mysql检索的数据在画布上绘制多个点。我只是找不出如何把这些数据从一个传递到另一个。
我选择这样的坐标:
<?php
$idnumber=htmlspecialchars($_SESSION['idnumber']);
if ($mark = $pdo->prepare("SELECT x, y FROM numbers WHERE id = ? ")) {
$mark ->execute(array($idnumber));
$data = $mark->fetchAll();
}
?>
我为java编写了一个非阻塞的MySQL接口(包装在标准mysql连接器上)。
我认为使用它的代码看起来有点难看.
db.rawQuery(queries.someAlreadyPreparedStatement, (new Callback(){
public void result(ResultSet result){
while (result.next()) {
//Handle each row from the result and do any processing
}
}));
如何才能改善这种情况?就这么好吗?