Android SQLite Database Tutorial (Select, Insert, Update, Delete) August 10, 2016 Mithilesh Singh Android 30 SQLite is an open-source social database i.e. Used to perform database operations on android gadgets, for example, putting away, controlling or recovering relentless information from the database. Firebird sql to insert a typical record from another table with only one different field. SQL update from one Table to another based on a ID match. Firebird SQL: The true open-source. Mostly based on the experience of optimization and maintenance of the Firebird databases and servers with a high number of.
SQLite INSERT Query - Learn SQLite in simple and easy steps starting from basic to advanced concepts with examples including database programming clauses command functions administration queries and usage along with PHP, PERL, C, C++, JAVA, Python, SQLite concepts, Overview, Installation, Commands, Syntax, Data Type, CREATE, ATTACH, DETACH. The SQLite INSERT statement is used to insert a single record or multiple records into a table in SQLite. Syntax The syntax for the SQLite INSERT statement when inserting a single record using the VALUES keyword is.
Active5 years, 9 months ago
I have the following table of counters:
I would like to increment one of the counters, or set it to zero if the corresponding row doesn't exist yet. Is there a way to do this without concurrency issues in standard SQL? The operation is sometimes part of a transaction, sometimes separate.
The SQL must run unmodified on SQLite, PostgreSQL and MySQL, if possible.
A search yielded several ideas which either suffer from concurrency issues, or are specific to a database:
- Try to
INSERT
a new row, andUPDATE
if there was an error. Unfortunately, the error onINSERT
aborts the current transaction. UPDATE
the row, and if no rows were modified,INSERT
a new row.- MySQL has an
ON DUPLICATE KEY UPDATE
clause.
EDIT: Thanks for all the great replies. It looks like Paul is right, and there's not a single, portable way of doing this. That's quite surprising to me, as it sounds like a very basic operation.
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Remy BlankRemy Blank3,4862 gold badges18 silver badges23 bronze badges
10 Answers
MySQL (and subsequently SQLite) also support the REPLACE INTO syntax:
This automatically identifies the primary key and finds a matching row to update, inserting a new one if none is found.
andygeersandygeers4,7979 gold badges41 silver badges62 bronze badges
SQLite supports replacing a row if it already exists:
You can shorten this to
This shortcut was added to be compatible with the MySQL
REPLACE INTO
expression.Firebird Sql Update Or Insert Sqlite Free
Kyle CroninKyle Cronin61.3k38 gold badges138 silver badges156 bronze badges
I would do something like the following:
Setting the generation value to 0 in code or in the sql but the using the ON DUP.. to increment the value. I think that's the syntax anyway.
jmozjmoz5,2933 gold badges25 silver badges28 bronze badges
the ON DUPLICATE KEY UPDATE clause is the best solution because:REPLACE does a DELETE followed by an INSERT so for an ever so slight period the record is removed creating the ever so slight possibility that a query could come back having skipped that if the page was viewed during the REPLACE query.
I prefer INSERT .. ON DUPLICATE UPDATE .. for that reason.
jmoz's solution is the best:though I prefer the SET syntax to the parentheses
Fire CrowFire Crow![Firebird Sql Update Or Insert Sqlite Firebird Sql Update Or Insert Sqlite](/uploads/1/2/4/7/124737728/289250626.png)
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I don't know that you are going to find a platform-neutral solution.
This is commonly called an 'UPSERT'.
See some related discussions:
Community♦
BradCBradC34.4k12 gold badges61 silver badges89 bronze badges
In PostgreSQL there is no merge command, and actually writing it is not trivial - there are actually strange edge cases that make the task 'interesting'.
The best (as in: working in the most possible conditions) approach, is to use function - such as one shown in manual (merge_db).
If you don't want to use function, you can usually get away with:
Just remember that it is not fault proof and it will fail eventually.
user80168
Standard SQL provides the MERGE statement for this task. Not all DBMS support the MERGE statement.
Jonathan LefflerJonathan Leffler591k97 gold badges709 silver badges1066 bronze badges
If you don't have a common way to atomically update or insert (e.g., via a transaction) then you can fallback to another locking scheme. A 0-byte file, system mutex, named pipe, etc..
ArnsheaArnshea10.2k2 gold badges14 silver badges19 bronze badges
Could you use an insert trigger? If it fails, do an update.
Michael ToddMichael Todd14.7k4 gold badges44 silver badges68 bronze badges
If you're OK with using a library that writes the SQL for you, then you can use Upsert (currently Ruby and Python only):
That works across MySQL, Postgres, and SQLite3.
It writes a stored procedure or user-defined function (UDF) in MySQL and Postgres. It uses
Seamus AbshereSeamus AbshereINSERT OR REPLACE
in SQLite3.6,3682 gold badges35 silver badges56 bronze badges
![Sql Sql](/uploads/1/2/4/7/124737728/503697747.jpg)
Not the answer you're looking for? Browse other questions tagged mysqlsqlsqlitepostgresqlupsert or ask your own question.
Active1 year, 7 months ago
I need to increment an existing value by N, or insert N if the key doesn't exist. I was looking for an atomic command, but Merge and Update Or Insert don't offer this (increment or insert). Is there a better solution than this pseudo code
Rick DeBay
Rick DeBayRick DeBay
2 Answers
You can do this with merge:
Of course under concurrent load this may still fail (eg two transaction inserting the same record, or two transactions updating the same record), so be prepared to retry your transaction.
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Mark RotteveelMark Rotteveel65.2k14 gold badges86 silver badges126 bronze badges
Sql Update Or Insert
This is from the comment by Arioch 'The. I was surprised, but it prepared. I'll test it when I have time. Whenever Arioch posts this as an answer I'll approve that so he can get the internet points.
Rick DeBayRick DeBay