hello_log_lynndai 2.0.0

Sql Builder

Welcome to the readme of Sql Builder. This is a library that allows developers to build a Sql Command or Sql Statement with Parameters using a strongly typed system similiar to LINQ without the hassle of creating/maintaining a db context.

Example:

All values supplied will be transformed to parameters. Therefore you won't have to worry about SQL Injection.

using (var connection = new SqlConnection())
{
    var command = connection.Build()
                    .From<Person>()
                    .Join<Work>((person,work) => person.WorkId == work.WorkId)
                    .Join<Person>((person, work,person2)=> person.Id == person2.Id)
                    .Where((person, work, person2) => person2.Age.In(new int[] { 1, 2 }))
                    .Select((person, work, person2) => new { person.Id, person.Name })
                    .ToSqlCommand();
}

SELECT [Person].[Id], [Person].[Name] FROM [Person] JOIN [Work] AS [Work] ON [Person].[WorkId] = [Work].[WorkId] JOIN [Person] AS [Person1] ON [Person].[Id] = [Person1].[Id] WHERE [Person1].[Age] IN (@P1,@P2)

Currently it only supports SQL Server. All the functions can be concatenated with eachother to freely buld your own query.

You can install Sql Builder through nuget.

How to use Sql Builder?

Building a query always starts with the From<T>() function and ends with the Select() function similiar to LINQ.

Basic Select query.

using (var connection = new SqlConnection())
{
    var command = connection.Build()
                    .From<Person>()
                    .Select(person => new { person.Id })
                    .ToSqlCommand();
}

SELECT [Person].[Id] FROM [Person]

You can add more columns to the select function by simply expanding the anonymous object within the Select function.

using (var connection = new SqlConnection())
{
    var command = connection.Build()
                    .From<Person>()
                    .Select(person => new { person.Id, person.Name })
                    .ToSqlCommand();
}

SELECT [Person].[Id], [Person].[Name] FROM [Person]

Adding a Where Clause.

Parameters used within the where clause will automatically be added to the command with its appropriate value to prevent SQL Injection.

using (var connection = new SqlConnection())
{
    var command = connection.Build()
                    .From<Person>()
                    .Where((person) => person.Salary > 5000)
                    .Select(person => new { person.Id, person.Name })
                    .ToSqlCommand();
}

SELECT [Person].[Id], [Person].[Name] FROM [Person] WHERE [Person].[Salary] > @P1

There's also support for In, Not In, Like, Not Like, Between, Not Between

using (var connection = new SqlConnection())
{
    IEnumerable<int> ages = new int[] { 1, 2 };
    var command = connection.Build()
                    .From<Person>()
                    .Where((person) => person.Age.In(ages))
                    .Select(person => new { person.Id, person.Name })
                    .ToSqlCommand();
}

SELECT [Person].[Id], [Person].[Name] FROM [Person] WHERE [Person].[Age] IN (@P1,@P2)

using (var connection = new SqlConnection())
{
    var command = connection.Build()
                    .From<Person>()
                    .Where((person) => person.Name.Like("base%"))
                    .Select(person => new { person.Id, person.Name })
                    .ToSqlCommand();
}

SELECT [Person].[Id], [Person].[Name] FROM [Person] WHERE [Person].[Age] LIKE @P1

using (var connection = new SqlConnection())
{
    var command = connection.Build()
                    .From<Person>()
                    .Where((person) => person.Age.Between(1,2))
                    .Select(person => new { person.Id, person.Name })
                    .ToSqlCommand();
}

SELECT [Person].[Id], [Person].[Name] FROM [Person] WHERE [Person].[Age] BETWEEN @P1 AND @P2

Joining other tables

using (var connection = new SqlConnection())
{
    var command = connection.Build()
                    .From<Person>()
                    .Join<Work>((person,work) => person.WorkId == work.WorkId)
                    .Select((person, work) => new { person.Id, person.Name, work.Address })
                    .ToSqlCommand();
}

SELECT [Person].[Id], [Person].[Name], [Work].[Address] FROM [Person] JOIN [Work] AS [Work] ON [Person].[WorkId] = [Work].[WorkId]

There's also support for self-joining

using (var connection = new SqlConnection())
{
    var command = connection.Build()
                    .From<Person>()
                    .Join<Person>((person, person2) => person.WorkId == person2.WorkId)
                    .Select((person, person2) => new { person.Id, person2.Name })
                    .ToSqlCommand();
}

SELECT [Person].[Id], [Person1].[Name] FROM [Person] JOIN [Person] AS [Person1] ON [Person].[WorkId] = [Person1].[WorkId]

You can join multiple tables aswell by using the Join function over and over.

using (var connection = new SqlConnection())
{
    var command = connection.Build()
                    .From<Person>()
                    .Join<Person>((person, person2) => person.WorkId == person2.WorkId)
                    .Join<Person>((person, person2,person3) => person.Name == person3.Name)
                    .Select((person, person2, person3) => new { person.Id, person2.Name , person3.Age })
                    .ToSqlCommand();
}

SELECT [Person].[Id], [Person1].[Name], [Person2].[Age] FROM [Person] JOIN [Person] AS [Person1] ON [Person].[WorkId] = [Person1].[WorkId] JOIN [Person] AS [Person2] ON [Person].[Name] = [Person2].[Name]

Adding a Group By Clause

using (var connection = new SqlConnection())
{
    var command = connection.Build()
                    .From<Person>()
                    .GroupBy((person) => new { person.Age })
                    .Select(person => new { person.Id, person.Name })
                    .ToSqlCommand();
}

SELECT [Person].[Id], [Person].[Name] FROM [Person] GROUP BY [Person].[Age]

There's also support to do Group By on multiple columns.

using (var connection = new SqlConnection())
{
    var command = connection.Build()
                    .From<Person>()
                    .GroupBy((person) => new { person.Age , person.Name })
                    .Select(person => new { person.Id, person.Name })
                    .ToSqlCommand();
}

SELECT [Person].[Id], [Person].[Name] FROM [Person] GROUP BY [Person].[Age], [Person].[Name]

Adding an Order By Clause

using (var connection = new SqlConnection())
{
    var command = connection.Build()
                    .From<Person>()
                    .GroupBy((person) => new { person.Age , person.Name })
                    .Select(person => new { person.Id, person.Name })
                    .ToSqlCommand();
}

SELECT [Person].[Id], [Person].[Name] FROM [Person] ORDER BY [Person].[Age]

There's also support to do Order By on multiple columns.

using (var connection = new SqlConnection())
{
    var command = connection.Build()
                    .From<Person>()
                    .OrderBy((person) => new { person.Age , person.Salary })
                    .Select(person => new { person.Id, person.Name })
                    .ToSqlCommand();
}

SELECT [Person].[Id], [Person].[Name] FROM [Person] ORDER BY [Person].[Age], [Person].[Salary]