DotMaysWind.Data

非常轻量级的数据库访问工具库，链式代码编写，封装了SQL语句以及各个数据库中常用的函数，支持Access、SQLite、SQL Server CE、SQL Server、MySQL以及Oracle数据库。

自己和小伙伴们的项目常使用该框架实现数据库操作，目前处于并将长期处于alpha或beta版。

在Web.config或App.config中配置好连接字符串：

<connectionStrings>
<add name="MainDatabase" connectionString="Data Source=SERVER_ADDRESS;Initial Catalog=DATABASE_NAME;Pooling=true;User ID='USERNAME';Password='PASSWORD';" providerName="System.Data.SqlClient"/>
</connectionStrings>

DotMaysWind.Data支持以下两种方式：

1、伪·Orm风格：

using System;
using System.Collections.Generic;

using DotMaysWind.Data;
using DotMaysWind.Data.Orm;

public class User
{
    public Int32 UserID { get; set; }
    public String UserName { get; set; }
}

public class UserDataRepository : AbstractDatabaseTable<User>
{
    private const String UserIDColumn = "UserID";
    private const String UserNameColumn = "UserName";

    public UserDataRepository()
        : base(MainDatabase.Instance) { }

    public override String TableName
    {
        get { return "tbl_Users"; }
    }

    protected override User CreateEntity(Object sender, EntityCreatingArgs args)
    {
        User entity = new User();

        entity.UserID = this.LoadInt32(args, UserIDColumn);
        entity.UserName = this.LoadString(args, UserNameColumn);

        return entity;
    }

    public Boolean InsertEntity(User user)
    {
        return this.Insert()
            .Set(UserIDColumn, user.UserID)
            .Set(UserNameColumn, user.UserName)
            .Result() > 0;
    }

    public Boolean UpdateEntity(User user)
    {
        return this.Update()
            .Set(UserNameColumn, user.UserName)
            .Where(c => c.Equal(UserIDColumn, user.UserID))
            .Result() > 0;
    }

    public Boolean DeleteEntity(Int32 userID)
    {
        return this.Delete()
            .Where(c => c.Equal(UserIDColumn, userID))
            .Result() > 0;
    }

    public List<User> GetEntities(Int32 pageSize, Int32 pageIndex)
    {
        return this.Select()
            .Querys(UserIDColumn, UserNameColumn)
            .OrderByAsc(UserNameColumn)
            .Paged(pageSize, pageIndex)
            .ToEntityList<User>(this);
    }
    
    public Int32 CountAllEntities()
    {
        return this.Select().Count();
    }
}

internal static class MainDatabase
{
    private static IDatabase _database;

    internal static IDatabase Instance
    {
        get { return _database; }
    }

    static MainDatabase()
    {
        _database = DatabaseFactory.CreateDatabase("MainDatabase");
    }
}

2、真·Orm风格：

using System;
using System.Collections.Generic;

using DotMaysWind.Data;
using DotMaysWind.Data.Linq;
using DotMaysWind.Data.Orm;

[DatabaseTable("tbl_Users")]
public class User
{
    [DatabaseColumn("UserID")]
    public Int32 UserID { get; set; }

    [DatabaseColumn("UserName")]
    public String UserName { get; set; }
}

public class UserDataRepository : DatabaseTable<User>
{
    public UserDataRepository()
        : base(MainDatabase.Instance) { }

    public Boolean InsertEntity(User user)
    {
        return this.Insert()
            .Set(user)
            .Result() > 0;
    }

    public Boolean UpdateEntity(User user)
    {
        return this.Update()
            .Set<User>(c => user.UserName, user.UserName)
            .Where<User>(c => c.UserID == user.UserID)
            .Result() > 0;
    }

    public Boolean DeleteEntity(Int32 userID)
    {
        return this.Delete()
            .Where<User>(c => c.UserID == userID)
            .Result() > 0;
    }

    public List<User> GetEntities(Int32 pageSize, Int32 pageIndex)
    {
        return this.Select()
            .Querys<User>(c => new { c.UserID, c.UserName })
            .OrderByAsc(c => c.UserName)
            .Paged(pageSize, pageIndex)
            .ToEntityList<User>(this);
    }
    
    public Int32 CountAllEntities()
    {
        return this.Select().Count();
    }
}

internal static class MainDatabase
{
    private static IDatabase _database;

    internal static IDatabase Instance
    {
        get { return _database; }
    }

    static MainDatabase()
    {
        _database = DatabaseFactory.CreateDatabase("MainDatabase");
    }
}