What really happens when I use varchar(10) in the sqlite command-line shell?

Posted by romandas on Stack Overflow See other posts from Stack Overflow or by romandas
Published on 2010-04-22T22:01:12Z Indexed on 2010/04/22 22:03 UTC
Read the original article Hit count: 561

Filed under:

sqlite

|

datatypes

|

sql

|

learning

I'm messing around with SQLite for the first time by working through some of the SQLite documentation. In particular, I'm using Command Line Shell For SQLite and the SoupToNuts SQLite Tutorial on Sourceforge.

According to the SQLite datatype documentation, there are only 5 datatypes in SQLite. However, in the two tutorial documents above, I see where the authors use commands such as create table tbl1(one varchar(10), two smallint); or create table t1 (t1key INTEGER PRIMARY KEY,data TEXT,num double,timeEnter DATE); which contain datatypes that aren't listed by SQLite, yet these commands work just fine.

Additionally, when I ran .dump to see the SQL statements, these datatype specifications are preserved.

So, what gives? Does SQLite keep a reference for any datatype specified in the SQL yet converts it behind the scenes to one of its 5 datatypes? Or is there something else I'm missing?

© Stack Overflow or respective owner

Related posts about sqlite

How to add SQLite (SQLite.NET) to my C# project

as seen on Stack Overflow - Search for 'Stack Overflow'
I followed the instructions in the documentation: Scenario 1: Version Independent (does not use the Global Assembly Cache) This method allows you to drop any new version of the System.Data.SQLite.DLL into your application's folder and use it without any code modifications or recompiling… >>> More
dotConnect or "sqlite.phxsoftware.com" for using Entity Framework with SQLite

as seen on Stack Overflow - Search for 'Stack Overflow'
Which is the better choice out of dotConnect or "sqlite.phxsoftware.com" for using Entity Framework with SQLite (in C#)? >>> More
SQLite table does not exist exception for existing SQLite database (and table)

as seen on Stack Overflow - Search for 'Stack Overflow'
I've followed the instructions given here for introducing an existing SQLite database to your Android app. When I query the table "android_metadata" this is fine. But when I run a similar query on my own table "words" (which has _id for primary integer key) I get a table does not exist exception… >>> More
Android Jelly bean database is locked (code 5)

as seen on Stack Overflow - Search for 'Stack Overflow'
Im getting a database is locked (code 5) in my ListActivity the code works in the other versions of the Emulator but fails in the 4.1 version of the emulator E/SQLiteLog( 2132): (5) database is locked E/SQLiteDatabase( 2132): Failed to open database '/data/data/id.online.mydroid/databases/geo… >>> More
Android:accessing assets folder sqlite databse file with .sqlite extension

as seen on Stack Overflow - Search for 'Stack Overflow'
How to read data from the assets folder sqlite database file with .sqlite extension in my android application? Thanks >>> More

Related posts about datatypes

C# datatypes vs. MySql datatypes

as seen on Stack Overflow - Search for 'Stack Overflow'
Does anyone has the list of conversion from MySQL data types to C# data types ? I'm having difficulties when tried to convert from smallint unsigned type into c# type. >>> More
Octave datatypes - float & double

as seen on Stack Overflow - Search for 'Stack Overflow'
I'm writing a framework for writing HDF files with JAVA (Using some existing framework). I need to keep compatibility with octave. That is, octave should be able to read the files my framework writes and vice versa. My question is, does Octave have two data types - float and double or it uses only… >>> More
What really happens when I use varchar(10) in the sqlite command-line shell?

as seen on Stack Overflow - Search for 'Stack Overflow'
I'm messing around with SQLite for the first time by working through some of the SQLite documentation. In particular, I'm using Command Line Shell For SQLite and the SoupToNuts SQLite Tutorial on Sourceforge. According to the SQLite datatype documentation, there are only 5 datatypes in SQLite. However… >>> More
Creating multiple relationships in rails with same datatypes

as seen on Stack Overflow - Search for 'Stack Overflow'
What I am trying to do is kind of like this: I have datatypes "user" and "article" for instance. I want to have relationships between these two, but in more than one way. So for instance, I'd like to let a user "like" or "bookmark" an article. So I need to have two relations in the database, one… >>> More
How to return variable datatypes from a method

as seen on Stack Overflow - Search for 'Stack Overflow'
I have a method whose callers require different datatypes. I could repeat the requisite conversions a dozen times by putting them in each of the callers, but it seems much more efficient to do it once in the called method. public String myMethod(String myArg) { return DoSomething(myArg); } public… >>> More