大约有 1,954 项符合查询结果（耗时：0.0173秒） [XML]
Automatically deleting related rows in Laravel (Eloquent ORM)
...ete, but not all DBs support this, so extra care is required. For instance MySQL with MyISAM engine doesn't, nor any NoSQL DBs, SQLite in the default setup, etc. Additional problem is that artisan will not warn you about this when you run migrations, it will just not create foreign keys on MyISAM ta...
How do I create a copy of an object in PHP?
...ing this, that cloning will keep reference to the original object. Running MySQL queries using the cloned object may have unpredictable results because of this, as execution may not take place in a linear fashion.
– Ælex
Mar 26 '13 at 16:30
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SQL: How to get the count of each distinct value in a column?
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CSV API for Java [closed]
...ds/writes Tab-delimited files.
Excel
InformixUnload
InformixUnloadCsv
MySQL
Oracle
PostgreSQLCsv
PostgreSQLText
RFC4180
TDF
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how do I query sql for a latest record date for each user
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Working for MySQL
– School Boy
Nov 26 '16 at 12:52
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Improve INSERT-per-second performance of SQLite
...com/rdpoor/CreateOrUpdate
which bulk loads an array of ActiveRecords into MySQL, SQLite or PostgreSQL databases. It includes an option to ignore existing records, overwrite them or raise an error. My rudimentary benchmarks show a 10x speed improvement compared to sequential writes -- YMMV.
I'm usi...
How to convert date to timestamp in PHP?
...DannyG just looked at the docs and it seems you're right if by DB you mean MySQL. But it does seem ridiculous to do this...
– Camilo Martin
Sep 15 '14 at 17:51
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Database design for a survey [closed]
... https://gist.github.com/durrantm/1e618164fd4acf91e372
The script and the mysql workbench.mwb file are also available at
https://github.com/durrantm/survey
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Is there any connection string parser in C#?
...on string builders from various providers like SqlConnectionStringBuilder, MySqlConnectionStringBuilder, SQLiteConnectionStringBuilder etc (unfortunately there is no public interface from MS this time). Otherwise you have DbProviderFactory.CreateConnectionStringBuilder which will give you an alterna...
What is the maximum length of latitude and longitude? [closed]
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More on lat/lng precision: mysql.rjweb.org/doc.php/latlng#representation_choices
– Rick James
Mar 4 '19 at 0:08
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