sql-delete | 易学教程

symfony2 deleteForm not working fine

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问题 I have 2 entities. I would like to delete row of Service. I tried: $em = $this->getDoctrine()->getEntityManager(); $service = $em->getRepository('AppBundle:Service')->find(1); $em->remove($service); $em->flush(); On this way it deleted all of the row, which containing this category id. Sry for my bad English. Let me explain you on the other way: BEFORE AFTER delete id 1 from service +----+------+ +----+------+-----+ +----+------+ +----+------+-----+ + id + ca_ + + id + se_ + ca_ + + id + ca_

Delete where both columns match

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问题 I have two tables Person (contain oldest date (farthest in future) when person moved OR WILL moved to another address) ID OLDESTADDRESSMOVEDATE 1 20161117 2 20171211 3 20160101 Address PersonID AddressMOVETODATE 1 20161117 1 20161111 1 20141018 2 20171211 2 20151210 Now I want to write a DELETE query which will DELETE FROM ADDRESS THE ROWS for EACH person in PERSON, where AddressMOVETODATE is PREVIOUS THAN the one in OLDESTADDRESSMOVEDATE colum e.g. If I run that query the remaining rows in

DELETE FROM for entries with same id, but leave the last one in the table

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问题 I have a table that contains id username password last_touch It is possible to have duplicate entries for the same id. The last_touch is the timestamp of the last insert command. How can I delete all entries with the same id, apart from the last one that is left so I always have the user details which are most up to date? Somewhere along the lines of: DELETE FROM user_data WHERE id=1 LIMIT (count(SELECT 1 FROM user_data WHERE id=1) - 1) (Obviously the syntax is not correct in the above

How to Update/Delete with elements from two different tables SQLite

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问题 I am working on a student grade submission program that accepts the following inputs: Student ID, Student First Name, Student Last Name, Class ID, Class Name, Grade Points, and Letter Grade. In order to prevent data redundancy I have created three different tables. However when attempting to "modify" or "delete" an entry with two values from distinct tables I am running into a problem. (For instance delete WHERE student.id is equal to the student.id in STUDENT_TABLE and WHERE class.id is

php - update set & delete issues - save deleting records

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问题 I have a script for editing existing data. A fetch array is used to populate fields with data and queries for deleting the record and amending the record. When I click Save the record is deleted and not saved even though it has the correct id. $feedid = mysql_real_escape_string($_POST['feedid']); $Query = "UPDATE ccregisterfeed SET author='$author', category='$category', copyright='$copyright', feeddescription='$feeddescription', feedtitle='$feedtitle', websitelink='$websitelink', imagelink='

Delete selected row in datagridview and also delete row in database

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问题 I want delete selected row in datagridview and also delete row in Mysql. private void deleteOrderButton_Click(object sender, EventArgs e) { int selectedIndex = orderDataGridView.CurrentCell.RowIndex; if (selectedIndex > -1) { orderDataGridView.Rows.RemoveAt(selectedIndex); orderDataGridView.Refresh(); } string constring = "datasource=localhost;port=3306;username=admin;password=acw123"; string Query = "delete from database.tem_order where temp_orderID = ???? MySqlConnection conDatabase = new

Deleting in chunks with MySQL

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问题 I'm trying to delete a large amount of data from my AWS RDS MySQL instance in chunks. I'm trying to adapt the code found in this link, but I'm stuck with a syntax error I cannot fix. Error: SQL Error (1064): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'main1: LOOP SELECT @z := operation_id FROM operations_test WHERE operation_id' at line 2 Code: SET @apt = 'DTW'; SET @a = (SELECT MIN(operation_id) FROM

php delete mysql row from link

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问题 I am trying to create a dynamic link that will let the user delete a row from a mysql database based on the rows ID #. I am also trying to input some javascript confirmation that the user really wants to delete the row in question. My question is how to accomplish this? I have some ideas...(see below) am I on the right track? <head> <?php require 'include/episodelist.db.php'; mysql_query("DELETE FROM season WHERE ID='$id'"); mysql_close(); ?> <script type="text/javascript"> function

how to solve this- Cannot delete or update a parent row: a foreign key constraint fails

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问题 I'm trying to drop table and I'm getting this error : Cannot delete or update a parent row: a foreign key constraint fails Some could help me please : the statement : DROP TABLE vehiculo the error : #1217 - Cannot delete or update a parent row: a foreign key constraint fails the tables that have a relationship with vehiculo: CREATE TABLE `vehiculo` ( `numero_movil` int(3) unsigned NOT NULL, `numeroChasis` varchar(30) COLLATE utf8_spanish2_ci NOT NULL, `numeroMotor` varchar(30) COLLATE utf8

Redirect to delete view in Django admin

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问题 I'm working on a Django/Wagtail project. I have a very customized feature in the admin view what will delete an object when hitting Save if certain conditions are met. I have this in my class (that is a snippet): def save(self, *args, **kwargs): if condition: self.delete() else: return super(MyModel, self).save(*args, **kwargs) This works as expected. The object gets deleted, but after this I get an error page because the browser remains in the same URL /snippets/myapp/mymodel/1234/ but the