QueryAll
This method is used to query all the rows from the table.
Code Snippets
Below is the sample code to fetch a row from the [dbo].[Person]
table.
using (var connection = new SqlConnection(connectionString))
{
var people = connection.QueryAll<Person>();
}
Targeting a Table
You can also target a specific table by passing the literal table like below.
using (var connection = new SqlConnection(connectionString))
{
var people = connection.QueryAll<Person>("[dbo].[Person]");
}
Or via dynamics.
using (var connection = new SqlConnection(connectionString))
{
var people = connection.QueryAll("[dbo].[Person]");
}
The result is a list of dynamic objects of type ExpandoObject.
Specific Columns
You can also target a specific columns to be queried by passing the list of fields to be included in the fields
argument.
using (var connection = new SqlConnection(connectionString))
{
var fields = Field.Parse<Person>(e => new
{
e.Id,
e.Name,
e.DateOfBirth,
e.DateInsertedUtc
});
var people = connection.QueryAll<Person>(fields: fields);
}
Or via dynamics.
using (var connection = new SqlConnection(connectionString))
{
var people = connection.Query("[dbo].[Person]",
fields: Field.From("Id", "Name", "DateOfBirth", "DateInsertedUtc"));
}
Type Result
You can also directly target a string column as a result set.
using (var connection = new SqlConnection(connectionString))
{
var names = connection.QueryAll<string>(ClassMappedNameCache.Get<Person>(),
fields: Field.From(nameof(Person.Name))).FirstOrDefault();
}
Inferrence works in all types but not from this operation. The other non-class type (i.e.: long
, int, System.DateTime, etc) cannot be inferred as the TEntity
generic type is filtered as class
. Please see the ExecuteQuery operation for the support to the other types.
Table Hints
To pass a hint, simply write the table-hints and pass it in the hints
argument.
using (var connection = new SqlConnection(connectionString))
{
var people = connection.QueryAll<Person>(hints: "WITH (NOLOCK)");
}
Or, you can use the SqlServerTableHints class.
using (var connection = new SqlConnection(connectionString))
{
var people = connection.QueryAll<Person>(hints: SqlServerTableHints.TabLock);
}
Ordering the Results
To order the results, you have to pass an array of OrderField
objects in the orderBy
argument.
using (var connection = new SqlConnection(connectionString))
{
var orderBy = OrderField.Parse(new
{
LastName = Order.Descending,
FirstName = Order.Ascending
});
var people = connection.QueryAll<Person>(orderBy: orderBy);
// Do the stuffs for 'people' here
}
Caching the Results
To cache the results, simply pass a literal string key into the cacheKey
argument.
using (var connection = new SqlConnection(connectionString))
{
var people = connection.QueryAll<Person>(cacheKey: "CackeKey:AllPeople");
// Do the stuffs for 'people' here
}
The cache expiration is defaulted to 180 minutes. You can override it by passing an integer value at the
cacheExpirationInMinutes
argument.