MySql Table Insert if not exist otherwise update
UPDATE AggregatedData SET datenum="734152.979166667", Timestamp="2010-01-14 23:30:00.000" WHERE datenum="734152.979166667";
It works if the
datenum exists, but I want to insert this data as a new row if the
datenum does not exist.
the datenum is unique but that's not the primary key
Jai is correct that you should use
INSERT ... ON DUPLICATE KEY UPDATE.
Note that you do not need to include datenum in the update clause since it's the unique key, so it should not change. You do need to include all of the other columns from your table. You can use the
VALUES() function to make sure the proper values are used when updating the other columns.
Here is your update re-written using the proper
INSERT ... ON DUPLICATE KEY UPDATE syntax for MySQL:
INSERT INTO AggregatedData (datenum,Timestamp) VALUES ("734152.979166667","2010-01-14 23:30:00.000") ON DUPLICATE KEY UPDATE Timestamp=VALUES(Timestamp)
MySql Table Insert if not exist otherwise update, Jai is correct that you should use INSERT ON DUPLICATE KEY UPDATE . Note that you do not need to include datenum in the update Sometimes we create MySQL tables which don’t contain auto increment primary key column. Instead, they may have unique key or combination of unique indexes. We wish to insert a new row if primary/unique key or keys combination doesn’t exist. Otherwise, update the record if exists in such table.
Try using this:
If you specify
ON DUPLICATE KEY UPDATE, and a row is inserted that would cause a duplicate value in a
UNIQUE index orPRIMARY KEY
, MySQL performs an [UPDATE`](http://dev.mysql.com/doc/refman/5.7/en/update.html) of the old row...
ON DUPLICATE KEY UPDATEclause can contain multiple column assignments, separated by commas.
ON DUPLICATE KEY UPDATE, the affected-rows value per row is 1 if the row is inserted as a new row, 2 if an existing row is updated, and 0 if an existing row is set to its current values. If you specify the
mysql_real_connect()when connecting to mysqld, the affected-rows value is 1 (not 0) if an existing row is set to its current values...
How to INSERT If Row Does Not Exist (UPSERT) in MySQL, Learn how to INSERT an If Row Does Not Exist (UPSERT) in MySQL. to INSERT rows after determining whether that row is, in fact, new or already exists Notice that we're using normal UPDATE syntax (but excluding the unnecessary table 1 Answer 1. Use INSERT You can use the VALUES(col_name) function in the UPDATE clause to refer to column values from the INSERT portion of the INSERT Note that I have used parameter placeholders in the place of string literals, as one really should be using parameterised statements to defend against SQL injection attacks.
I had a situation where I needed to update or insert on a table according to two fields (both foreign keys) on which I couldn't set a UNIQUE constraint (so INSERT ... ON DUPLICATE KEY UPDATE won't work). Here's what I ended up using:
replace into last_recogs (id, hasher_id, hash_id, last_recog) select l.* from (select id, hasher_id, hash_id, [new_value] from last_recogs where hasher_id in (select id from hashers where name=[hasher_name]) and hash_id in (select id from hashes where name=[hash_name]) union select 0, m.id, h.id, [new_value] from hashers m cross join hashes h where m.name=[hasher_name] and h.name=[hash_name]) l limit 1;
This example is cribbed from one of my databases, with the input parameters (two names and a number) replaced with [hasher_name], [hash_name], and [new_value]. The nested SELECT...LIMIT 1 pulls the first of either the existing record or a new record (last_recogs.id is an autoincrement primary key) and uses that as the value input into the REPLACE INTO.
If exists then update else insert, Hope This helps, DUPLICATE KEY UPDATE create table machine( machine_id int not null primary key, machine_name varchar(50), reg_id int ); MySQL Manual :: INSERT INTO ON DUPLICATE KEY UPDATE Syntax. or. MySQL Manual :: REPLACE INTO Syntax. Both will allow you to do the insert-if-not-exists-or-update in one query.
How to insert if not exist in MySQL?, There are several ways to insert a row of data to a table while determining whether that row is new, or already existed. Using INSERT IGNORE. Let's have a basic insert query: Using INSERT ON DUPLICATE KEY UPDATE. Using REPLACE. We can use the REPLACE statement: Using INSERT IGNORE effectively causes MySQL to ignore execution errors while attempting to perform INSERT statements. This means that an INSERT IGNORE statement which contains a duplicate value in a UNIQUE index or PRIMARY KEY field does not produce an error, but will instead simply ignore that particular INSERT command entirely.
Does mysql UPDATE inserts the values if it doesn't exist?, Or is this something I should do through PHP with m… IF NOT EXISTS ( SELECT user_id, bot_id FROM tmp_battles WHERE user_id = 1 check in the mysql manual for the INSERT statement with ON DUPLICATE KEY UPDATE clause Add another unique key (assing_bot + assign_user) to the table. Jai is correct that you should use INSERT ON DUPLICATE KEY UPDATE. Note that you do not need to include datenum in the update clause since it's the unique key, so it should not change. You do need to include all of the other columns from your table.
IF NOT EXISTS INSERT, ELSE UPDATE -- Is it possible?, We wish to insert a new row if primary/unique key or keys combination doesn't exist. Otherwise, update the record if exists in such table. So here I' There are three ways to insert record in Codeigniter if it doesn’t exist else update the record if it exists. Here we’re using the Active Record as well as Query Binding features in Codeigniter to insert or update a record. There is also similar article for the native PHP and MYSQL way. You can read that here.