Is it possible to check if an SQLite table exists.

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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.

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';

Python sqlite3 – Check if Table exists, Here 'table_name' is the name of table for which you are looking for. Android code: private boolean checkForTableExists(SQLiteDatabase db, String table){  In Android, check if sqlite database exists fails from time to time (4) In Android I use the following method to see if the sqlite database exist and if I can open it and use it. If it fail this test I copy the database file from the assets (this should only happen once, when the user first start the app).

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

How do I check in SQLite whether a table exists?, In this tutorial, you will learn how to use the SQLite EXISTS operator to test for the the EXISTS operator checks if the customer id exists in the invoices table. The EXISTS part is used to find out whether there is an existing row in the table with the same id whose status value is 'COMPLETE'. If this condition is matched, nothing is done (due to the WHERE NOT ).

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);

        }

SQLite EXISTS, To check if a Table exists in SQLite you can use the following snippet. 1. SELECT name FROM sqlite_master WHERE type=  Index ' ' on table '. It will delete the row if the row with the unique column already exists and than it does an insert. Notice that the REPLACE statement means INSERT or REPLACE, not INSERT or UPDATE. ^The SQLITE_SOURCE_ID macro evaluates to ** a string which identifies a particular check-in of SQLite ** within its configuration management

How to check if a Table exists in SQLite, I am not asking for unreliable ways like checking if a "select *" on the table returned an Python sqlite3 – Check if Table exists, Android code: private boolean  Only then is it possible to delete the artist. sqlite> DELETE FROM track WHERE trackname = 'My Way'; sqlite> DELETE FROM artist WHERE artistname = 'Frank Sinatra'; sqlite> -- Try to update the artistid of a row in the artist table while there sqlite> -- exists records in the track table that refer to it.

How do I check in SQLite whether a table exists?, http://stackoverflow.com/questions/3058909/how-does-one-check-if-a-table-​exists-in-an-android-sqlite-database can you show me how to call this method. [x] sqlite [ ] sqljs [ ] react-native [ ] expo. TypeORM version: [ ] latest [ ] @next [x] 0.2.7. Question: Is it possible to tell TypeORM to check if relation target exists by unique column other than PK? Problem: Save data obtained from external source to normalized database. Example / reproduction:

Check table if exists on SQLite · GitHub, Does anyone know how to check if a SQLite table exists? I've been Googling and trying things to no avail :( sqlite> create table department( id int primary key not null, dept char(50) not null, emp_id int not null ); You can verify if your table has been created successfully using SQLite command .tables command, which will be used to list down all the tables in an attached database.

Comments
  • How about running a simple SELECT on a table and based on the output/error do what you need to do?
  • 1 for faster than me :)
  • Your's isn't bad, either. It's more copy-and-pasty than mine. :o)
  • Hehe ya hence I mentioned the source