开源库：https://github.com/Cocon90/Cocon90.Db

Sqlite位置：https://www.nuget.org/packages/Cocon90.Db.Sqlite

Mysql位置：https://www.nuget.org/packages/Cocon90.Db.Mysql

SqlServer位置：https://www.nuget.org/packages/Cocon90.Db.SqlServer

一、简介
Cocon90.Db是由Cocon90.Db.Common为核心的类库与其它数据库操作库组合而成，以方便调用为主要目的，支持ORM操作，增、删、改、查、事务、批量执行、创建表、插入或保存记录 等等，并提供多种数据库支持。当前已支持Mysql、Sqlite、SqlServer。

Cocon90.Db is a core class library which is composed of Cocon90.Db.Common and other database operations, which is convenient to call for the main purpose, and provides a variety of database support. Currently supports Mysql, Sqlite, SqlServer.

二、运行环境

环境	值
NetFramework4.0+	Required
VisualStudio 2015+	Required

三、使用方法
（1）新建一件空的项目，取名Cocon90.Db.Demo。
（2）添加对库Cocon90.Db.Common.dll的引用，或者执行Install-Package Cocon90.Db.Common。
（3）接下来，如果要操作SqlServer数据库则引入Cocon90.Db.SqlServer，如果要操作Sqlite数据库，则引入Cocon90.Db.Sqlite，如果要操作Mysql，则需要引入Cocon90.Db.Mysql库。

DataBase	Require Library
MySql	Cocon90.Db.Common,Cocon90.Db.Mysql
Sqlite	Cocon90.Db.Common,Cocon90.Db.Sqlite
SqlServer	Cocon90.Db.Common,Cocon90.Db.SqlServer

（4）新建Program类，加入Main函数，比如我们要操作Sqlite数据库加入下列代码：

static void Main(string[] args){    var dh = Cocon90.Db.Common.Db.GetDataHelper("Cocon90.Db.Sqlite.dll", "Cocon90.Db.Sqlite.DbDriver", "D:\\mysqlite.db;");// or you can use app.config by this code:    var dh = Cocon90.Db.Common.Db.GetDataHelper();}

如果在要读取配置文件中的app.config中的连接语句，则需要在App.config中进行如下配置：

<configuration><connectionStrings><!--<add name="ConnectionString" providerName="Cocon90.Db.Mysql.dll|Cocon90.Db.Mysql.DbDriver" connectionString="Server=127.0.0.1;Port=3306;Database=world;Uid=root;Pwd=123456;"/>--><!--<add  name="ConnectionString" providerName="Cocon90.Db.SqlServer.dll|Cocon90.Db.SqlServer.DbDriver" connectionString="Server=127.0.0.1;Database=world;Uid=sa;Pwd=123456;"/>--><add name="ConnectionString" providerName="Cocon90.Db.Sqlite.dll|Cocon90.Db.Sqlite.DbDriver" connectionString="Data Source=D:\Application\DbTools\sqliteSpy\SQLiteSpy.db3;"/></connectionStrings></configuration>

然后即可进行数据库的常规操作：

    var tab = dh.GetTable("select * from Student");    dh.ExecNoQuery("...");    dh.GetString("...");    dh.GetBoolean("...");    dh.GetInt("...");    dh.GetListString("...");    dh.GetPagedResult("...");    dh.CreateOrUpdateTable(typeof(Model.Student));

下面是常用的一些测试：

 class Program    {static void Main(string[] args){//var dh = Cocon90.Db.Common.Db.GetDataHelper("Cocon90.Db.Sqlite.dll", "Cocon90.Db.Sqlite.DbDriver", "D:\\Application\\DbTools\\sqliteSpy\\SQLiteSpy.db3;");

            var dh = Cocon90.Db.Common.Db.GetDataHelper();

            var createSql = dh.GetCreateTableSql<Model.CountryLanguageModel>();            var updateTabSql = dh.GetUpdateTableSql(typeof(Model.CountryLanguageModel));            var effRow = dh.CreateOrUpdateTable<Model.CountryLanguageModel>();

            var needInserts = new List<Model.CountryLanguageModel>();            Random rand = new Random();for (int i = 0; i < 500; i++)            {                needInserts.Add(new Model.CountryLanguageModel() { Percent = (decimal)(rand.NextDouble() * 10), Date = DateTime.Now.AddDays(-1 * i), Guid = Guid.NewGuid(), IsOfficial = rand.Next(0, 2) > 0, Code = i, Language = "Lang_" + i });            }            var succRows = dh.Save(needInserts.ToArray());            dh.GetTable("SELECT * FROM countrylanguage");            var lst = dh.GetList<Model.CountryLanguageModel>("SELECT * FROM countrylanguage");            Console.WriteLine(lst.Count);            var oneModel = dh.GetOne<Model.CountryLanguageModel>("select * from countrylanguage");            var oneModel2 = dh.GetOneByPrimaryKey<Model.CountryLanguageModel>(1, "Lang_1");//var successRows = dh.Insert(new Model.CountryLanguage() { Percent = 1.555m, IsOfficial = false, Code = 2, Language = "Lang" },//      new Model.CountryLanguage() { Percent = 1.66m, IsOfficial = true, Code = 3, Language = "Lang" });            var updateSql = dh.GetUpdateSqlByPrimaryKey(new Model.CountryLanguageModel() { Percent = 9.9m }, true, "1=1 AND 2=2", 3, "Lang");            var updateSql2 = dh.GetUpdateSql(new Model.CountryLanguageModel { Code = 3, Percent = 3.3m }, false, null);            var updateSql3 = dh.GetUpdateSqlByWhere(new Model.CountryLanguageModel { Code = 3, Percent = 3.3m }, true, "Language='Lang'", new Common.Data.Params("@Name", "song"));            var updateRow3 = dh.UpdateByByWhere(new Model.CountryLanguageModel { Percent = 3.3m }, true, "Language='Lang'");            var updateRow = dh.UpdateByPrimaryKey(new Model.CountryLanguageModel { Percent = 4.5m }, true, null, 3, "Lang");            var deleteSql = dh.GetDeleteSqlByPrimaryKey<Model.CountryLanguageModel>("1=1", 3, "Lang");            var deleteSql1 = dh.GetDeleteSqlByPrimaryKey<Model.CountryLanguageModel>(null, 3, "Lang_111");            var deleteSql2 = dh.GetDeleteSqlByWhere<Model.CountryLanguageModel>("Percentage=@Perc", new Common.Data.Params("Perc", 100));            var deleteSql3 = dh.GetDeleteSql(new Model.CountryLanguageModel { Code = 3, Percent = 3.3m }, "1=@myParam", new Common.Data.Params("myParam", 1));            var deleteSql4 = dh.GetDeleteSql<Model.CountryLanguageModel>(null, "1=@myParam", new Common.Data.Params("myParam", 1));            var successRow = dh.Delete(new Model.CountryLanguageModel { Code = 3, Percent = 4.5m });

            var saveSql = dh.GetSaveSql(new Model.CountryLanguageModel() { Percent = 1.555m, IsOfficial = false, Code = 2, Language = "Lang" },new Model.CountryLanguageModel() { Percent = 1.66m, IsOfficial = true, Code = 3, Language = "Lang" });            var saveRows = dh.Save(new Model.CountryLanguageModel() { Percent = 1.555m, IsOfficial = false, Code = 2, Language = "Lang" },new Model.CountryLanguageModel() { Percent = 1.66m, IsOfficial = true, Code = 3, Language = "Lang" });            var executeNoQuery = dh.ExecNoQuery("update countrylanguage set Percentage=4.4 where Percentage=@Percentage", new Model.CountryLanguageModel { Percent = 1.6m });            var pageSql = dh.Driver.GetPagedSql("select * from countrylanguage", "CountryCode", true, 1, 10);            var pageResult = dh.GetPagedResult<Model.CountryLanguageModel>("select * from countrylanguage", "countrycode", true, 1, 10);

        }    }

其中测试实体类：

    public class Student    {        [Cocon90.Db.Common.Attribute.Column(PrimaryKey = true)]public Guid? Id { get; set; }public string Name { get; set; }public string Addrss { get; set; }public DateTime? Birthday { get; set; }    }

    [Table(TableName = "CountryLanguage")]public class CountryLanguageTab    {        [Column(PrimaryKey = true, ColumnName = "CountryCode")]public int? Code { get; set; }        [Column(PrimaryKey = true, CreateDDL = "varchar(20)")]public string Language { get; set; }public bool? IsOfficial { get; set; }        [Column(ColumnName = "Percentage", PrimaryKey = false)]public decimal? Percent { get; set; }public DateTime? Date { get; set; }public Guid? Guid { get; set; }    }

    [Table(TableName = "CountryLanguage")]public class CountryLanguageModel : CountryLanguageTab    {        [Ignore]public string CodeAndLang { get; set; }    }

需要注意的是，实体的设计时，所有类型都必须可以为NULL值（如果是结构体类型，请采用可空类型）。