Sqlite create database if not exists c#

Step : Find the SQLite into Nuget packages and click install button. If database exists , there are no affect any tables and the database. I would also close the connection every time, this has already been covered by other. To execute any kind of data definition command on the database you need an open connection to pass the command. In your code you create the connection AFTER the execution of the query.

UWP create database with SQLite - Stack. SQLite: create table and add a row if the. How do I check in SQLite whether a database.

The schema can be the main database , temp database or any attached database. Fourth, specify the column list of the table. Each column has a name, data type, and the column constraint. SQLite supports PRIMARY KEY, UNIQUE, NOT NULL, and CHECK column constraints. Fifth, specify the table constraints such as PRIMARY KEY, FOREIGN KEY, UNIQUE, and CHECK constraints.

Finally, optionally use the WITHOUT ROWID option. Typically, You end-up using the ExecuteNonQuery() method to perform operations on the data dictionary ( create , drop etc.), while other methods, such as, ExecuteReader() can be used to retrieve (extended) of that query defined in the CommandText property. First, SQLite checked the UNIQUE constraint.

Secon because this statement violated the UNIQUE constraint by trying to add the DBA title that already exists , SQLite deleted the existing row. Thir SQLite inserted a new row with the data provided by the REPLACE statement. Notice that the REPLACE statement means INSERT or REPLACE, not INSERT or. Attempt to create a table into a database which contains a table or index or view of the same name, an error will occur, but if IF NOT EXISTS clause is specified as a part of the CREATE TABLE statement will create no effect.

That is, the SQLite engine will go back to its default ( DELETE ), if the client does not state the journal mode on the next connection. Dropping columns and renaming does not supported by SQLite. So it is better way to create a new table with the changes according to your requirement, then drop the original table and again rename the just created new table to the original table name.

In SQLite , sqlitecommand is used to create a new SQLite database. You do not need to have any special privilege to create a database. Step 2: Download the SQLite code. Create a Visual Studio console application.

For programs running in. Specifically I 1) installed SQLite on my PC. NET Core console application. Entity Framework Core is lightweight and compared to its previous versions.

Since EF Core was developed from scratch and it is decomposed in smaller packages so you can use only those which are needed in your project. SQL file that contains the tables schema and you want to create a new database with the same tables from that file, in the following example, we will explain how to do this. Example: In the following example, we will create the sample database. Then, SQLite tried to insert a new row with two columns: ( i min_salary). However, it violates the NOT NULL constraint of the title column.

Therefore, SQLite rolls back the transaction. If the title column does not have the NOT NULL constraint, the REPLACE statement will insert a new row whose the title column is NULL. There are no arbitrary limits on the number of indices that can be attached to a single table. The number of columns in an index is limited to the value set by sqlite3_limit ( SQLITE _LIMIT_COLUMN ,).

If the UNIQUE keyword appears between CREATE and INDEX then duplicate index entries are not allowed.