SQLRequest (gb.db)

Since 3.8

This class provides a facility to generate a basic SQL request on a single table.

Tato třída je vytvořitelný.

Tato třída může být použita jako funkce.

Metoda
And   Specify that the next WHERE clause will be concatenated with the AND operator.
Delete   Tells that the request is a DELETE request.
From   Specify the table of the request.
Get   Return the SQL request corresponding to the SQLRequest object.
Or   Specify that the next WHERE clause will be concatenated with the OR operator.
OrderBy   Describe the ORDER BY clause of the request.
Select   Tells that the request is a SELECT request.
Where   Specify one criterion of the WHERE clause.

The class preserves Gambas DBMS independence. In other words the same code will produce a request that is syntactically correct for the dialect of the underlying database.

Example

Dim hConn As Connection
Dim iAgeMin As Integer = 18
Dim iAgeMax As Integer = 30
Dim hSqlRequest As SqlRequest
    
' ... Initializing the connection

hSqlRequest = New SqlRequest(hConn)
Print hSqlRequest.Select("id", "name", "age").From("people").Where("age >= &1", iAgeMin).And().Where("age <= &1", iAgeMax).OrderBy("name", "age DESC").Get()

will result in an SQL DML sentence that is correct for the database type specified by the hConn Connection:

SELECT id, name, age FROM people WHERE age >= 18 AND age <= 30 ORDER BY name,age DESC