Hello, I'm just starting to experiment with sqlite and System.Data.SQLite. How
do they make use of the connection string |DataDirectory| macro? I've found
lots of references online showing that it is indeed used, but I haven't found
how to extract the file path from it at runtime.
Given a connection string such as "Data
Source=|DataDirectory|TestDatabase.sqlite;", I want to be able to create the
database file if it does not exist, and I want to extract that path from the
connection string.
In SQL CE, I could do this:
public string GetSqlCeDataSource()
{
var connectionString =
ConfigurationManager.ConnectionStrings[ConnectionStringName];
var factory = DbProviderFactories.GetFactory(connectionString.ProviderName);
using (var connection = factory.CreateConnection())
{
if (connection == null)
{
throw new InvalidOperationException(String.Format(
"Failed to create connection for {0}",
connectionString.ProviderName));
}
connection.ConnectionString = connectionString.ConnectionString;
return connection.Database;
}
}
But sqlite returns "main" as the database instead of the file name.
So I worked around it by using a ConnectionStringBuilder and parsing the macro
myself, but is there a better way to do this?
Here's the workaround (null checks removed for simplicity):
public void EnsureDatabase()
{
var connectionStringSettings =
ConfigurationManager.ConnectionStrings[ConnectionStringName];
var factory =
DbProviderFactories.GetFactory(connectionStringSettings.ProviderName);
var builder = factory.CreateConnectionStringBuilder();
builder.ConnectionString = connectionStringSettings.ConnectionString;
var dataDirectory =
AppDomain.CurrentDomain.GetData("DataDirectory").ToString();
string databaseFilePath = builder["Data
Source"].ToString().Replace("|DataDirectory|", null);
databaseFilePath = Path.Combine(dataDirectory, databaseFilePath);
if (!Directory.Exists(dataDirectory))
{
Directory.CreateDirectory(dataDirectory);
}
if (!File.Exists(databaseFilePath))
{
SQLiteConnection.CreateFile(databaseFilePath);
}
}
Thanks,
Lee
