如何使用 C# 检查 .sqlite 文件中的表是否存在

Question

I am creating a WPF program where the user can create lists of products that are stored in an .sqlite database. Each product list has it's own table inside the database, who's name is chosen by the user. I need to figure out if the table already exists when I try to create them so that if they do I can ask the user to choose a different name.

I know

SELECT name FROM sqlite_master WHERE type='table' AND name='{table_name}';

is the query used to check if a table exists but how do I get this statement in boolean form using c#?

I would assume something similar to

SQLiteConnection connection = new SQLiteConnection("Data Source=filepath;Version=3");
sql = "SELECT name FROM sqlite_master WHERE type='table' AND name='{table_name}';"
SQLiteCommand command = new SQLiteCommand(sql, connection);
command.something();

But I am unsure what function of command to use to get the Boolean value of this query and how to format it.

Answer 1

ExecuteNonQuery() returns -1 for SELECT statements, so it would be inappropriate to use it in this case.

try using ExecuteReader() , which returns a SqliteDataReader class that contains the HasRows property, in which should be true in case of a non-empty result set.

the code:

SQLiteConnection connection = new SQLiteConnection("Data Source=filepath;Version=3");
sql = "SELECT name FROM sqlite_master WHERE type='table' AND name='{table_name}';"
SQLiteCommand command = new SQLiteCommand(sql, connection);

try 
{
  var result = command.ExecuteReader();

  if (result.HasRows) 
  {
    // INSERT statement here
  }

}
catch (Exception e) 
{
  throw e;
}