Is it possible to check if an SQLite table exists. - sqlite

Question

I have the following code:
dbcon = DependencyService.Get<ISQLite>().GetConnection();
// create the tables
dbcon.CreateTable<Category>();
dbcon.CreateTable<Settings>();
var settings = dbcon.Table<Settings>().ToList();
if (settings.Count <= 0)
{
var noa = new Settings { Setting = "NumberOfAnswers", Value = 5 };
var cfs = new Settings { Setting = "CardFrontSide", Value = 0 };
dbcon.Insert(noa);
dbcon.Insert(cfs);
}
var categories = dbcon.Table<Category>().ToList();
if (categories.Count <= 0)
{
InsertCategory();
}
From what I can see the application is using SQLite-net
What I would like to know is if there is a way I can check to see if a table exists rather than do this which is to try and create it anyway and then try to check if it has rows in it.

Answer 1

This query will return the list of tables in the database
SELECT * FROM sqlite_master WHERE type = 'table';
You can filter it down to a single row for an "exists" check.
SELECT * FROM sqlite_master WHERE type = 'table' AND tbl_name = 'xyz';

Answer 2

You can do something like this:
public static bool TableExists<T> (SQLiteConnection connection)
{
const string cmdText = "SELECT name FROM sqlite_master WHERE type='table' AND name=?";
var cmd = connection.CreateCommand (cmdText, typeof(T).Name);
return cmd.ExecuteScalar<string> () != null;
}
Source

Answer 3

You can use the below codes
public bool IsTableExists(string tableName)
{
try
{
var tableInfo = database.GetConnection().GetTableInfo(tableName);
if(tableInfo.Count > 0)
{
return true;
}
else
{
return false;
}
}
catch
{
return false;
}
}
public SQLiteAsyncConnection database;
public ClientDatabase(string dbPath)
{
database = new SQLiteAsyncConnection(dbPath);
}