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133 lines
5.3 KiB
Markdown
133 lines
5.3 KiB
Markdown
# FreeSql
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打造 .NETCore 最方便的orm，dbfirst codefirst混合使用，codefirst模式下的开发阶段，建好实体不用执行任何，就能创建表和修改字段，dbfirst模式下提供api+模板，自定义生成代码，
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https://github.com/2881099/FreeSql/blob/master/Docs/generator.md 默认提供了3种模板。
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* [Insert 插入数据](Docs/insert.md)
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* [Update 更新数据](Docs/update.md)
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* [Delete 删除数据](Docs/delete.md)
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* [Select 查询数据](Docs/select.md)
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* [CodeFirst 快速开发](Docs/codefirst.md)
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* [DbFirst 快速开发](Docs/dbfirst.md)
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* [DbFirst 生成器](Docs/generator.md)
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# 查询数据
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```csharp
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IFreeSql fsql = new FreeSql.FreeSqlBuilder()
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.UseConnectionString(FreeSql.DataType.MySql, "Data Source=127.0.0.1;Port=3306;User ID=root;Password=root;Initial Catalog=cccddd;Charset=utf8;SslMode=none;Max pool size=10")
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.Build();
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ISelect<Topic> select => fsql.Select<Topic>();
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[Table(Name = "tb_topic")]
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class Topic {
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[Column(IsIdentity = true, IsPrimary = true)]
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public int Id { get; set; }
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public int Clicks { get; set; }
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public int TestTypeInfoGuid { get; set; }
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public TestTypeInfo Type { get; set; }
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public string Title { get; set; }
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public DateTime CreateTime { get; set; }
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}
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class TestTypeInfo {
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public int Guid { get; set; }
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public int ParentId { get; set; }
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public TestTypeParentInfo Parent { get; set; }
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public string Name { get; set; }
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}
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class TestTypeParentInfo {
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public int Id { get; set; }
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public string Name { get; set; }
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public List<TestTypeInfo> Types { get; set; }
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}
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```
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### 返回 List
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```csharp
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List<Topic> t1 = select.Where(a => a.Id > 0).Skip(100).Limit(200).ToList();
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```
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### 返回 List + 导航属性的数据
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```csharp
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List<Topic> t2 = select.LeftJoin(a => a.Type.Guid == a.TestTypeInfoGuid).ToList();
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//此时会返回普通字段 + 导航对象 Type 的数据
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```
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### 指定字段返回
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```csharp
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//返回一个字段
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List<int> t3 = select.Where(a => a.Id > 0).Skip(100).Limit(200).ToList(a => a.Id);
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//返回匿名类
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List<匿名类> t4 = select.Where(a => a.Id > 0).Skip(100).Limit(200).ToList(a => new { a.Id, a.Title });
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//返回元组
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List<(int, string)> t5 = select.Where(a => a.Id > 0).Skip(100).Limit(200).ToList<(int, string)>("id, title");
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```
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### 执行SQL返回数据
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```csharp
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class xxx {
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public int Id { get; set; }
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public string Path { get; set; }
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public string Title2 { get; set; }
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}
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List<xxx> t6 = fsql.Ado.Query<xxx>("select * from song");
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List<(int, string ,string)> t7 = fsql.Ado.Query<(int, string, string)>("select * from song");
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List<dynamic> t8 = fsql.Ado.Query<dynamic>("select * from song");
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```
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# 联表
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### 使用导航属性联表
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```csharp
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sql = select.LeftJoin(a => a.Type.Guid == a.TestTypeInfoGuid).ToSql();
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//SELECT a.`Id` as1, a.`Clicks` as2, a.`TestTypeInfoGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a.`Title` as7, a.`CreateTime` as8 FROM `tb_topic` a LEFT JOIN `TestTypeInfo` a__Type ON a__Type.`Guid` = a.`TestTypeInfoGuid`
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sql = select
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.LeftJoin(a => a.Type.Guid == a.TestTypeInfoGuid)
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.LeftJoin(a => a.Type.Parent.Id == a.Type.ParentId).ToSql();
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//SELECT a.`Id` as1, a.`Clicks` as2, a.`TestTypeInfoGuid` as3, a__Type.`Guid` as4, a__Type.`ParentId` as5, a__Type.`Name` as6, a.`Title` as7, a.`CreateTime` as8 FROM `tb_topic` a LEFT JOIN `TestTypeInfo` a__Type ON a__Type.`Guid` = a.`TestTypeInfoGuid` LEFT JOIN `TestTypeParentInfo` a__Type__Parent ON a__Type__Parent.`Id` = a__Type.`ParentId`
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```
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### 没有导航属性联表
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```csharp
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sql = select.LeftJoin<TestTypeInfo>((a, b) => b.Guid == a.TestTypeInfoGuid).ToSql();
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//SELECT a.`Id` as1, a.`Clicks` as2, a.`TestTypeInfoGuid` as3, b.`Guid` as4, b.`ParentId` as5, b.`Name` as6, a.`Title` as7, a.`CreateTime` as8 FROM `tb_topic` a LEFT JOIN `TestTypeInfo` b ON b.`Guid` = a.`TestTypeInfoGuid`
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sql = select
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.LeftJoin<TestTypeInfo>((a, b) => b.Guid == a.TestTypeInfoGuid)
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.LeftJoin<TestTypeParentInfo>((a, c) => c.Id == a.Type.ParentId).ToSql();
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//SELECT a.`Id` as1, a.`Clicks` as2, a.`TestTypeInfoGuid` as3, b.`Guid` as4, b.`ParentId` as5, b.`Name` as6, a.`Title` as7, a.`CreateTime` as8 FROM `tb_topic` a LEFT JOIN `TestTypeInfo` b ON b.`Guid` = a.`TestTypeInfoGuid` LEFT JOIN `TestTypeParentInfo` c ON c.`Id` = b.`ParentId`
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```
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### 联表任意查
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```csharp
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sql = select.From<TestTypeInfo, TestTypeParentInfo>((s, b, c) => s
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.LeftJoin(a => a.TestTypeInfoGuid == b.Guid)
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.LeftJoin(a => b.ParentId == c.Id)).ToSql();
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//SELECT a.`Id` as1, a.`Clicks` as2, a.`TestTypeInfoGuid` as3, b.`Guid` as4, b.`ParentId` as5, b.`Name` as6, a.`Title` as7, a.`CreateTime` as8 FROM `tb_topic` a LEFT JOIN `TestTypeInfo` b ON a.`TestTypeInfoGuid` = b.`Guid` LEFT JOIN `TestTypeParentInfo` c ON b.`ParentId` = c.`Id`
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```
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### 原生SQL联表
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```csharp
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sql = select.LeftJoin("TestTypeInfo b on b.Guid = a.TestTypeInfoGuid and b.Name = ?bname", new { bname = "xxx" }).ToSql();
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//SELECT a.`Id` as1, a.`Clicks` as2, a.`TestTypeInfoGuid` as3, a.`Title` as4, a.`CreateTime` as5 FROM `tb_topic` a LEFT JOIN TestTypeInfo b on b.Guid = a.TestTypeInfoGuid and b.Name = ?bname
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```
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### 表达式函数支持
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#### String 对象方法
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StartsWith, EndsWith, Contains, ToLower, ToUpper, Substring, Length, IndexOf, PadLeft, PadRight, Trim, TrimStart, TrimEnd, Replace, CompareTo
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#### Math 方法
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...
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# 更多文档整理中。。。
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## 贡献者名单
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