pharmataya.blogg.se - Mysql insert

Mysql insert update#

Mysql insert update#

Syntax, and in the UPDATE part just do nothing do some meaningless Third option is to use INSERT … ON DUPLICATE KEY UPDATE Method 3: using INSERT … ON DUPLICATE KEY UPDATE: Thus it should be used if previously tested without the Non-abortion of the query in case any other problem occurs (see the This second method has several potential weaknesses, including Record doesn’t yet exist, it will be created. For example, without IGNORE, a row thatĭuplicates an existing UNIQUE index or PRIMARY KEY value in the tableĬauses a duplicate-key error and the statement is aborted.”.) If the Keyword, errors that occur while executing the INSERT statement are Here’s a quote from MySQL reference manual: “If you use the IGNORE Here, if the ‘ensembl_transcript_id’ is already present in theĭatabase, it will be silently skipped (ignored). Method 2: using INSERT IGNORE Also very simple: INSERT IGNORE INTO `transcripts` However, using this method isn’t efficientįor our case: we do not need to overwrite existing records, it’s fine

If the record exists, it will be overwritten if it does not yetĮxist, it will be created. It’s very simple: REPLACE INTO `transcripts`

repeated executions will not die due to ‘duplicate.

repeated executions of the pipeline will not destroy our.

Might be broken at any step of execution. Meta-data from Ensembl, and that due to various reasons the pipeline Now imagine that we have an automatic pipeline importing transcripts `transcript_chrom_end` int(10) unsigned NOT NULL, `transcript_chrom_start` int(10) unsigned NOT NULL,

`ensembl_transcript_id` varchar(20) NOT NULL, Imagine we have a table: CREATE TABLE `transcripts` ( There are 3 possible solutions: using INSERT IGNORE, REPLACE, or But there are several very easy ways to accomplish what is To start: as of the latest MySQL, syntax presented in the title is not Post from according to Google's webcache: There's also INSERT … ON DUPLICATE KEY UPDATE syntax, and you can find explanations in 13.2.6.2 INSERT.