DbUtility

by Ivony

Ivony / DbUtility

a light database access tool

206 Stars 77 Forks Last release: Not found Apache License 2.0 212 Commits 6 Releases

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DataPithy

DataPithy is a light database access tool

How to use

execute a query

CSharp
db.T( "SELECT * FROM Members" ).ExecuteDataTable();

execute a query with parameter and return first row

CSharp
db.T( "SELECT FirstName, LastName FROM Members WHERE Username = {0}", username ).ExecuteFirstRow();

execute a query as async.

CSharp
await db.T( "SELECT FirstName, LastName FROM Members WHERE Username = {0}", username ).ExecuteFirstRowAsync();

Basic concept

db.T( "SELECT FirstName, LastName FROM Members WHERE Username = {0}", username ).ExecuteFirstRow();

In the code above,

db
is called database executor,
T( "SELECT FirstName, LastName FROM Members WHERE Username = {0}", username )
is called query definition,
and
ExecuteFirstRow()
is called result definition

The following code creates a database executor

CSharp
var db = SqlServer.Create( "connection-string-name" );
Or
CSharp
var db = SqlServer.Connect( "connection-string" );

database executor is responsible for createing connection and executing queries.


A typical query definition like this below

CSharp
db.T( "query-text-template", params parameters );
The query text is SQL command to be executed. and you can use parameter placehold inside like
string.Format
syntax. like this below:
CSharp
db.T( "SELECT MemberID FROM Members WHERE Username = {0} AND Password = {1}", username, password )
it will create a SQL query like this below:
SQL
DECLARE @Param0 AS nvarchar = 'text of username';
DECLARE @Param1 AS nvarchar = 'text of password';
SELECT MemberID FROM Members WHERE Username = @Param0 AND Password = @Param1;
the method name T means Template, so we can also write code like below:
CSharp
db.Template( "SELECT MemberID FROM Members WHERE Username = {0} AND Password = {1}", username, password )
and the T is an extension method, you can declare another query definition method as you like.

In the last, we talk about the result definition. like same as the query definition, result definition are also en extension method. we have many result definition method, and all of they have asynchronous version. the popular result definition method under this:

ExecuteNonQuery, execute query, and return the number of rows affected.
ExecuteScaler, execute query and return the first column of the first row.
ExecuteDataTable, execute query and fill a DataTable and return.
ExecuteFirstRow, execute query and return ths first row.
ExecuteEntity, execute query and return the first row to fill the specified type of entity

Get It

you can download last stable release from nuget: DataPithy

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