Recent questions tagged MySQL

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I do know that php can turn a newline into a <br /> using nl2br(), but is there a way that it can ... is now separated by a newline/line break? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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542 views

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mysql - JDBC connection timeout cannot reconnect

I have my Spring Hibernate web application running on MySQL that gives me trouble. I have searched around ... -> 0, test ConnectionOnCheckin -> false, testConnectio...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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626 views

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mysql - PHP PDO Buffered query problem

I'm having some serious problems with the PHP Data Object functions. I'm trying to loop through a sizeable ... Any help would be appreciated. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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645 views

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mysql - return custom query select in activerecord

I've got a query that does some math and returns a calculated custom select field with the result set. I ... needed to do this before. Thanks See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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837 views

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mysql - codeigniter - database : how to update multiple tables with a single update query

I saw this on the codeigniter forum Considering the below code UPDATE a INNER JOIN b USING (id) SET a. ... 's Active Record Database Class? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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920 views

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mysql - Column 'id' in where clause is ambiguous

I get this error and I can't figure out why? Error Number: 1052 Column 'id' in where clause is ambiguous SELECT ` ... >db->get(); What is wrong? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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585 views

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mysql - Blob and Storage Requirement

I have a requirement to store user uploaded files to the database (filesystem is not an option). The files that ... size) in a MEDIUMBLOB field. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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711 views

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mysql - Django distinct group by query on two fields

I have a model which have 2 fields. class MyModel: tcode = Charfield created_on = Date field #some more fields now ... any row would work fine. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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653 views

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mysql - How get the sum for every distinct value in another column?

Suppose my table contains the following: ID price ------------- 1 10 1 10 2 20 2 20 3 30 3 30 Each ... , I on the other hand am using MySQL. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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609 views

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mysql - Django models: default value for column

I have following Django model code: status = models.PositiveIntegerField(default = 0b000) comments_allowed = models.BooleanField ... 1.3.0 final See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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495 views

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mysql - Select values from a list that are not in a table

I have a list of ids: (1, 2, 3, 6, 7) And a table: id | anothercolumn ----------------- ... to solve this problem in the nicest way possible? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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479 views

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mysql - Sending ArrayList from Android to PHP script using JSON

What is the Scenario I want to send multiple ArrayList (usally 5) from android to the server and want to ... above and Thanks for you Time See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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651 views

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mysql - Fetching RAND() rows without ORDER BY RAND() in just one query

Using RAND() in MySQL to get a single random row out of a huge table is very slow: SELECT quote FROM quotes ... solve this with just one query? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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623 views

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mysql - How can I search within a table of comma-separated values?

I have a MySQL table which contains comma-separated values like this: first row=(3,56,78,12) second row=(6,44,2 ... set. How can I do this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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583 views

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mysql - Autoincrement of table id using string combination in database automatically

We know that id of any table is of integer type and auto-increment in that table is fine. But my problem is ... not use two type of unique key. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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944 views

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mysql - PHP - Does PDO quote safe from SQL Injection?

$id = trim((int)$_GET['id']); $sql = 'SELECT * FROM users WHERE id = ' . $db->quote($id) . ' ... prepared statements all the way in my script? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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523 views

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mysql - What's a good approach to managing the db connection in a Google Cloud SQL (GAE) Python app?

I'm just learning Google App Engine and am trying to figure out a good approach to managing my database ... to best reuse DB connections? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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633 views

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mysql - Change the step auto_increment fields increment by

How do I change the amount auto_increment fields in MySQL increment by from the default (1) to n? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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592 views

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mysql - Subtracting one row of data from another in SQL

I've been stumped with some SQL where I've got several rows of data, and I want to subtract a row from the ... foo f2 Thank you for the assist. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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694 views

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mysql - LEFT JOIN after GROUP BY?

I have a table of "Songs", "Songs_Tags" (relating songs with tags) and "Songs_Votes" (relating songs with boolean ... I need to use a subquery? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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522 views

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mysql - Are prepared statements cached server-side across multiple page loads with PHP?

I learnt about prepared statements when making a JDBC-enabled Java application, and my app uses a connection ... execution plan server-side. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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552 views

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mysql - What if I need a very very big autoincrement ID?

According to the MySQL website, the signed bigint can go up to 18446744073709551615. What if I need a number ... auto-incrementing primary key? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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630 views

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mysql - Combine two columns in SQL for WHERE clause

In my SQL, I am using the WHERE and LIKE clauses to perform a search. However, I need to perform the ... combined value of these two columns. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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571 views

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mysql - IF Condition Perform Query, Else Perform Other Query

It feels pretty straightforward in anything but MySQL. Basically I need to switch what type of index I am using ... popularity of the "term". See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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862 views

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mysql - SQL count - not working

I am trying this code: SELECT COUNT (oferta_id_oferta) FROM `oferta_has_tags` WHERE oferta_id_oferta = (SELECT id_oferta ... is the problem? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.1k views

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mysql - Error Code: 1822. Failed to add the foreign key constaint. Missing index for constraint

I found some threads about the error. But all the solutions doesn't work for me. I created 2 tables a user ... this doesn't shows any erros. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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622 views

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mysql - How to know if when using "on duplicate key update" a row was inserted or updated?

We have a database that gets updated everyday at midnight with a cronjob, we get new data from an external ... number of new insertions. Thanks See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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483 views

1 answer

mysql - How do I check if PHP is connected to a database already?

Basically in pseudo code I'm looking for something like if (connected_to_any_database()) { // do ... I implement connected_to_any_database() See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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