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I am using the PDO Database Abstraction library to make sure my code is portable. However, I now find that I need column information so I turned to the PDOStatement->getColumnMeta() method hoping it would be somewhat standardized - but from what I have found it actually seems open-ended.
For example, when calling that method from SQLite it seems you get one set of possible values:
http://gcov.php.net/PHP_5_3/lcov_html/pdo_sqlite/sqlite_statement.c.gcov.php
null
double
blob
string
integer
...
While a call from the MySQL database lists all kinds of other weird values: http://gcov.php.net/PHP_5_3/lcov_html/pdo_mysql/mysql_statement.c.gcov.php
var_string
longlong
newdecimal
geometry
...
I may be looking in the wrong place also, but I just can't find any useful data on what "native_type" values can be when it comes to switching around databases.
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The PHP Data Objects (PDO) defines a lightweight interface for accessing databases in PHP. It provides a data-access abstraction layer for working with databases in PHP. It defines consistent API for working with various database systems.
PDO—PHP Data Objects—are a database access layer providing a uniform method of access to multiple databases. It doesn't account for database-specific syntax, but can allow for the process of switching databases and platforms to be fairly painless, simply by switching the connection string in many instances.
The PHP Data Objects ( PDO ) extension defines a lightweight, consistent interface for accessing databases in PHP. Each database driver that implements the PDO interface can expose database-specific features as regular extension functions.
This is one of those areas of PDO that was left intentionally undefined, in order to keep the abstraction light weight.
PDO does not define a standard representation of types for this method; each driver has it's own idea about what it can return here.
131
PDO is not a database abstraction. It is "only" an unified access layer. If you switch to another database system you most likely have to change the code. Each (specific) database driver returns its own set of values and there's no "translation layer" for the driver:decl_type info in pdo beyond the native_type/pdo_type fields in the result of getColumnMeta()
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