问题:

I know this is similar to this question, but I'm using SQL Server CE 3.5 with a WinForms project in C#. How can I determine whether a table exists? I know the IF keyword is not supported, though EXISTS is. Does information_schema exist in CE where I can query against it? Thanks.

回答1:

Yes, it does exist:

SELECT *
FROM INFORMATION_SCHEMA.TABLES
WHERE TABLE_NAME = 'TableName'

回答2:

As an alternative you can Query the Table and catch the Exception thrown. If there is an Exception, the Table wasn't found, else the Table exists.

SELECT TOP 1 1 FROM TableName;

A little and simple Performance Test had better Results than the Query against INFORMATION_SCHEMA. Although I would consider a Query against INFORMATION_SCHEMA as cleaner.

回答3:

Using Database helper:

var db = Database.Open("MyDatabase");
var sql = @"SELECT Count(*) FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_NAME = 'MyTable'"
var count = db.QueryValue(sql);
if(count.Equals(1)){
    //table exists
}