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Including SQLite, to be fair. Its dynamic typing can make for rather nasty surprises if you try to import its data into anything else.
by creshal 10y ago
Including SQLite, to be fair. Its dynamic typing can make for rather nasty surprises if you try to import its data into anything else.
- cwyers 10y agoHrm.[1] > (3) SQLite lets me insert a string into a database column of type integer! > This is a feature, not a bug. SQLite uses dynamic typing. It does not enforce data type constraints. Data of any type can (usually) be inserted into any column. You can put arbitrary length strings into integer columns, floating point numbers in boolean columns, or dates in character columns. The datatype you assign to a column in the CREATE TABLE command does not restrict what data can be put into that column. Every column is able to hold an arbitrary length string. (There is one exception: Columns of type INTEGER PRIMARY KEY may only hold a 64-bit signed integer. An error will result if you try to put anything other than an integer into an INTEGER PRIMARY KEY column.) > But SQLite does use the declared type of a column as a hint that you prefer values in that format. So, for example, if a column is of type INTEGER and you try to insert a string into that column, SQLite will attempt to convert the string into an integer. If it can, it inserts the integer instead. If not, it inserts the string. This feature is called type affinity. I did not know that. I am... incredibly horrified. 1) https://www.sqlite.org/faq.html#q3 https://www.sqlite.org/faq.html#q3
- creshal 10y agoIt's why I don't use SQLite without some sort of ORM layer to do the typechecking and to sanely migrate schema changes.