diff --git a/FreeSql/Internal/Utils.cs b/FreeSql/Internal/Utils.cs index bc0ebac1..77c72468 100644 --- a/FreeSql/Internal/Utils.cs +++ b/FreeSql/Internal/Utils.cs @@ -98,7 +98,7 @@ namespace FreeSql.Internal { } static Dictionary dicExecuteArrayRowReadClassOrTuple = new Dictionary { - { typeof(bool ).FullName, true }, + { typeof(bool).FullName, true }, { typeof(sbyte).FullName, true }, { typeof(short).FullName, true }, { typeof(int).FullName, true }, diff --git a/readme.md b/readme.md index b6370b46..138888fd 100644 --- a/readme.md +++ b/readme.md @@ -2,266 +2,232 @@ 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，作者提供了3种模板。 -* [Insert 插入数据](Docs/insert.md)、[Update 更新数据](Docs/update.md)、[Delete 删除数据](Docs/delete.md)、 [Select 查询数据](Docs/select.md) +* [《CodeFirst 快速开发文档》](Docs/codefirst.md) -* [Expression 表达式函数](Docs/expression.md) - -* [CodeFirst 快速开发](Docs/codefirst.md)、 [DbFirst 快速开发](Docs/dbfirst.md)、 [DbFirst 生成器](Docs/generator.md) - -# 查询数据 +* [《DbFirst 快速开发文档》](Docs/dbfirst.md) +# 快速开始 ```csharp +var connstr = "Data Source=127.0.0.1;Port=3306;User ID=root;Password=root;" + + "Initial Catalog=cccddd;Charset=utf8;SslMode=none;Max pool size=10"; + IFreeSql fsql = new FreeSql.FreeSqlBuilder() - .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") + .UseConnectionString(FreeSql.DataType.MySql, connstr) .UseSlave("connectionString1", "connectionString2") //使用从数据库，支持多个 + .UseLogger(null) //使用日志，不指定默认输出控制台 ILogger .UseCache(null) //使用缓存，不指定默认使用内存 IDistributedCache - .UseAutoSyncStructure(true) //自动同步实体结构到数据库 - .UseSyncStructureToLower(true) //转小写同步结构 - .Build(); -ISelect select => fsql.Select(); + .UseAutoSyncStructure(true) //自动同步实体结构到数据库 + .UseSyncStructureToLower(true) //转小写同步结构 + .Build(); +``` + +# 实体 +```csharp [Table(Name = "tb_topic")] class Topic { - [Column(IsIdentity = true, IsPrimary = true)] + [Column(IsIdentity = true)] public int Id { get; set; } public int Clicks { get; set; } - public int TestTypeInfoGuid { get; set; } - public TestTypeInfo Type { get; set; } public string Title { get; set; } public DateTime CreateTime { get; set; } + + public int TypeId { get; set; } + public TopicType Type { get; set; } //导航属性 } -class TestTypeInfo { - public int Guid { get; set; } - public int ParentId { get; set; } - public TestTypeParentInfo Parent { get; set; } +class TopicType { + [Column(IsIdentity = true)] + public int Id { get; set; } public string Name { get; set; } + + public int ClassId { get; set; } + public TopicTypeClass Class { get; set; } //导航属性 } -class TestTypeParentInfo { +class TopicTypeClass { public int Id { get; set; } public string Name { get; set; } } ``` -### 返回 List -```csharp -List t1 = select.Where(a => a.Id > 0).Skip(100).Limit(200).ToList(); -``` +# Part1: 查询 -### 返回 List + 导航属性的数据 ```csharp -List t2 = select.LeftJoin(a => a.Type.Guid == a.TestTypeInfoGuid).ToList(); -//此时会返回普通字段 + 导航对象 Type 的数据 -``` +List t1 = fsql.Select() + .Where(a => a.Id > 0) + .ToList(); + +//返回普通字段 + 导航对象 Type 的数据 +List t2 = fsql.Select() + .LeftJoin(a => a.Type.Id == a.TypeId) + .ToList(); -### 指定字段返回 -```csharp //返回一个字段 -List t3 = select.Where(a => a.Id > 0).Skip(100).Limit(200).ToList(a => a.Id); +List t3 = fsql.Select() + .Where(a => a.Id > 0) + .ToList(a => a.Id); -//返回匿名类 -List<匿名类> t4 = select.Where(a => a.Id > 0).Skip(100).Limit(200).ToList(a => new { a.Id, a.Title }); +//返回匿名类型 +List<匿名类型> t4 = fsql.Select() + .Where(a => a.Id > 0) + .ToList(a => new { a.Id, a.Title }); //返回元组 -List<(int, string)> t5 = select.Where(a => a.Id > 0).Skip(100).Limit(200).ToList<(int, string)>("id, title"); +List<(int, string)> t5 = fsql.Select() + .Where(a => a.Id > 0) + .ToList<(int, string)>("id, title"); ``` - -### 执行SQL返回数据 +### 联表之一：使用导航属性 ```csharp -class xxx { - public int Id { get; set; } - public string Path { get; set; } - public string Title2 { get; set; } -} +sql = fsql.Select() + .LeftJoin(a => a.Type.Id == a.TypeId) + .ToSql(); -List t6 = fsql.Ado.Query("select * from song"); -List<(int, string ,string)> t7 = fsql.Ado.Query<(int, string, string)>("select * from song"); -List t8 = fsql.Ado.Query("select * from song"); +sql = fsql.Select() + .LeftJoin(a => a.Type.Id == a.TypeId) + .LeftJoin(a => a.Type.Class.Id == a.Type.ClassId) + .ToSql(); ``` - -# 联表 - -### 使用导航属性联表 +### 联表之二：无导航属性 ```csharp -sql = select.LeftJoin(a => a.Type.Guid == a.TestTypeInfoGuid).ToSql(); -//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` +sql = fsql.Select() + .LeftJoin((a, b) => b.Id == a.TypeId) + .ToSql(); -sql = select - .LeftJoin(a => a.Type.Guid == a.TestTypeInfoGuid) - .LeftJoin(a => a.Type.Parent.Id == a.Type.ParentId).ToSql(); -//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` +sql = fsql.Select() + .LeftJoin((a, b) => b.Id == a.TypeId) + .LeftJoin((a, c) => c.Id == a.Type.ClassId) + .ToSql(); ``` - -### 没有导航属性联表 +### 联表之三：b, c 条件怎么设？试试这种！ ```csharp -sql = select.LeftJoin((a, b) => b.Guid == a.TestTypeInfoGuid).ToSql(); -//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` - -sql = select - .LeftJoin((a, b) => b.Guid == a.TestTypeInfoGuid) - .LeftJoin((a, c) => c.Id == a.Type.ParentId).ToSql(); -//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` +sql = fsql.Select() + .From((s, b, c) => s + .LeftJoin(a => a.TypeId == b.Id) + .LeftJoin(a => b.ClassId == c.Id)) + .ToSql(); ``` - -### 联表任意查 +### 联表之四：原生SQL联表 ```csharp -sql = select.From((s, b, c) => s - .LeftJoin(a => a.TestTypeInfoGuid == b.Guid) - .LeftJoin(a => b.ParentId == c.Id)).ToSql(); -//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` +sql = fsql.Select() + .LeftJoin("TopicType b on b.Id = a.TypeId and b.Name = ?bname", new { bname = "xxx" }) + .ToSql(); ``` -### 原生SQL联表 +# Part2: 添加 ```csharp -sql = select.LeftJoin("TestTypeInfo b on b.Guid = a.TestTypeInfoGuid and b.Name = ?bname", new { bname = "xxx" }).ToSql(); -//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 +var items = new List(); +for (var a = 0; a < 10; a++) items.Add(new Topic { Title = $"newtitle{a}", Clicks = a * 100 }); + +var t1 = fsql.Insert().AppendData(items.First()).ToSql(); +//INSERT INTO `tb_topic`(`Clicks`, `Title`, `CreateTime`) VALUES(?Clicks0, ?Title0, ?CreateTime0) ``` +### 批量插入 +```csharp +var t2 = fsql.Insert().AppendData(items).ToSql(); +//INSERT INTO `tb_topic`(`Clicks`, `Title`, `CreateTime`) VALUES(?Clicks0, ?Title0, ?CreateTime0), (?Clicks1, ?Title1, ?CreateTime1), (?Clicks2, ?Title2, ?CreateTime2), (?Clicks3, ?Title3, ?CreateTime3), (?Clicks4, ?Title4, ?CreateTime4), (?Clicks5, ?Title5, ?CreateTime5), (?Clicks6, ?Title6, ?CreateTime6), (?Clicks7, ?Title7, ?CreateTime7), (?Clicks8, ?Title8, ?CreateTime8), (?Clicks9, ?Title9, ?CreateTime9) +``` +### 插入指定的列 +```csharp +var t3 = fsql.Insert().AppendData(items).InsertColumns(a => a.Title).ToSql(); +//INSERT INTO `tb_topic`(`Title`) VALUES(?Title0), (?Title1), (?Title2), (?Title3), (?Title4), (?Title5), (?Title6), (?Title7), (?Title8), (?Title9) -## 表达式函数 -| 表达式 | MySql | SqlServer | PostgreSQL | 功能说明 | -| - | - | - | - | - | -| a ? b : c | case when a then b else c end | case when a then b else c end | - | a成立时取b值，否则取c值 | -| a ?? b | ifnull(a, b) | isnull(a, b) | coalesce(a, b) | 当a为null时，取b值 | -| 数字 + 数字 | a + b | a + b | a + b | 数字相加 | -| 数字 + 字符串 | concat(a, b) | cast(a as varchar) + cast(b as varchar) | case(a as varchar) \|\| b | 字符串相加，a或b任意一个为字符串时 | -| a - b | a - b | a - b | a - b | 减 -| a * b | a * b | a * b | a * b | 乘 -| a / b | a / b | a / b | a / b | 乘 -| a % b | a mod b | a mod b | a mod b | 模 +var t4 = fsql.Insert().AppendData(items).InsertColumns(a => new { a.Title, a.Clicks }).ToSql(); +//INSERT INTO `tb_topic`(`Clicks`, `Title`) VALUES(?Clicks0, ?Title0), (?Clicks1, ?Title1), (?Clicks2, ?Title2), (?Clicks3, ?Title3), (?Clicks4, ?Title4), (?Clicks5, ?Title5), (?Clicks6, ?Title6), (?Clicks7, ?Title7), (?Clicks8, ?Title8), (?Clicks9, ?Title9) +``` +### 忽略列 +```csharp +var t5 = fsql.Insert().AppendData(items).IgnoreColumns(a => a.CreateTime).ToSql(); +//INSERT INTO `tb_topic`(`Clicks`, `Title`) VALUES(?Clicks0, ?Title0), (?Clicks1, ?Title1), (?Clicks2, ?Title2), (?Clicks3, ?Title3), (?Clicks4, ?Title4), (?Clicks5, ?Title5), (?Clicks6, ?Title6), (?Clicks7, ?Title7), (?Clicks8, ?Title8), (?Clicks9, ?Title9) -> 等等... +var t6 = fsql.Insert().AppendData(items).IgnoreColumns(a => new { a.Title, a.CreateTime }).ToSql(); +///INSERT INTO `tb_topic`(`Clicks`) VALUES(?Clicks0), (?Clicks1), (?Clicks2), (?Clicks3), (?Clicks4), (?Clicks5), (?Clicks6), (?Clicks7), (?Clicks8), (?Clicks9) +``` +### 执行命令 +| 方法 | 返回值 | 描述 | +| - | - | - | +| ExecuteAffrows | long | 执行SQL语句，返回影响的行数 | +| ExecuteIdentity | long | 执行SQL语句，返回自增值 | +| ExecuteInserted | List\ | 执行SQL语句，返回插入后的记录 | -### 字符串对象 -| 表达式 | MySql | SqlServer | PostgreSQL | 功能说明 | -| - | - | - | - | - | -| string.Empty | '' | '' | '' | 空字符串表示 | -| a.CompareTo(b) | strcmp(a, b) | - | - | 比较a和b大小 | -| a.Contains('b') | a like '%b%' | a like '%b%' | - | a是否包含b | -| a.EndsWith('b') | a like '%b' | a like '%b' | - | a尾部是否包含b | -| a.IndexOf(b) | locate(a, b) - 1 | locate(a, b) - 1 | - | 查找a中出现b的位置 | -| a.Length | char_length(a) | len(a) | - | 返回a的字符串长度 | -| a.PadLeft(b, c) | lpad(a, b, c) | - | - | 在a的左侧充字符c，直到字符串长度大于b | -| a.PadRight(b, c) | rpad(a, b, c) | - | - | 在a的右侧充字符c，直到字符串长度大于b | -| a.Replace(b, c) | replace(a, b, c) | replace(a, b, c) | - | 将a中字符串b，替换成c | -| a.StartsWith('b') | a like 'b%' | a like 'b%' | - | a头部是否包含b | -| a.Substring(b, c) | substr(a, b, c) | substring(a, b, c) | - | 截取a中位置b到c的内容 | -| a.ToLower | lower(a) | lower(a) | - | 转小写 | -| a.ToUpper | upper(a) | upper(a) | - | 转大写 | -| a.Trim | trim(a) | trim(a) | - | 移除两边字符 | -| a.TrimEnd | rtrim(a) | rtrim(a) | - | 移除左侧指定字符 | -| a.TrimStart | ltrim(a) | ltrim(a) | - | 移除右侧指定字符 | +# Part3: 修改 +### 更新指定列 +```csharp +var t1 = fsql.Update(1).Set(a => a.CreateTime, DateTime.Now).ToSql(); +//UPDATE `tb_topic` SET `CreateTime` = '2018-12-08 00:04:59' WHERE (`Id` = 1) +``` +### 更新指定列，累加 +```csharp +var t2 = fsql.Update(1).Set(a => a.Clicks + 1).ToSql(); +//UPDATE `tb_topic` SET `Clicks` = ifnull(`Clicks`,0) + 1 WHERE (`Id` = 1) +``` +### 保存实体 +```csharp +var item = new Topic { Id = 1, Title = "newtitle" }; +var t3 = fsql.Update().SetSource(item).ToSql(); +//UPDATE `tb_topic` SET `Clicks` = ?p_0, `Title` = ?p_1, `CreateTime` = ?p_2 WHERE (`Id` = 1) +``` +### 保存实体，忽略一些列 +```csharp +var t4 = fsql.Update().SetSource(item) + .IgnoreColumns(a => a.Clicks).ToSql(); +//UPDATE `tb_topic` SET `Title` = ?p_0, `CreateTime` = ?p_1 WHERE (`Id` = 1) -### 日期对象 -| 表达式 | MySql | SqlServer | PostgreSQL | 功能说明 | -| - | - | - | - | - | -| DateTime.Now | now() | getdate() | - | 取本地时间 | -| DateTime.UtcNow | utc_timestamp() | getutcdate() | - | 取UTC时间 | -| DateTime.Today | curdate | convert(char(10),getdate(),120) | - | 取本地时间，日期部分 | -| DateTime.MaxValue | cast('9999/12/31 23:59:59' as datetime) | '1753/1/1 0:00:00' | - | 最大时间 | -| DateTime.MinValue | cast('0001/1/1 0:00:00' as datetime) | '9999/12/31 23:59:59' | - | 最小时间 | -| DateTime.Compare(a, b) | a - b | a - b | - | 比较a和b的大小 | -| DateTime.DaysInMonth(a, b) | dayofmonth(last_day(concat(a, '-', b, '-1'))) | datepart(day, dateadd(day, -1, dateadd(month, 1, cast(a as varchar) + '-' + cast(b as varchar) + '-1'))) | - | 取指定年月份的总天数 | -| DateTime.Equals(a, b) | a = b | a = b | - | 比较a和b相等 | -| DateTime.IsLeapYear(a) | a%4=0 and a%100<>0 or a%400=0 | a%4=0 and a%100<>0 or a%400=0 | - | 判断闰年 | -| DateTime.Parse(a) | cast(a as datetime) | cast(a as datetime) | - | 转换日期类型 | -| a.Add(b) | date_add(a, interval b microsecond) | dateadd(millisecond, b / 1000, a) | - | 增加TimeSpan值 | -| a.AddDays(b) | date_add(a, interval b day) | dateadd(day, b, a) | - | 增加天数 | -| a.AddHours(b) | date_add(a, interval b hour) | dateadd(hour, b, a) | - | 增加小时 | -| a.AddMilliseconds(b) | date_add(a, interval b*1000 microsecond) | dateadd(millisecond, b, a) | - | 增加毫秒 | -| a.AddMinutes(b) | date_add(a, interval b minute) | dateadd(minute, b, a) | - | 增加分钟 | -| a.AddMonths(b) | date_add(a, interval b month) | dateadd(month, b, a) | - | 增加月 | -| a.AddSeconds(b) | date_add(a, interval b second) | dateadd(second, b, a) | - | 增加秒 | -| a.AddTicks(b) | date_add(a, interval b/10 microsecond) | dateadd(millisecond, b / 10000, a) | - | 增加刻度，微秒的1/10 | -| a.AddYears(b) | date_add(a, interval b year) | dateadd(year, b, a) | - | 增加年 | -| a.Date | cast(date_format(a, '%Y-%m-%d') as datetime) | convert(char(10),a,120) | - | 获取a的日期部分 | -| a.Day | dayofmonth(a) | datepart(day, a) | - | 获取a在月的第几天 | -| a.DayOfWeek | dayofweek(a) | datepart(weekday, a) - 1 | - | 获取a在周的第几天 | -| a.DayOfYear | dayofyear(a) | datepart(dayofyear, a) | - | 获取a在年的第几天 | -| a.Hour | hour(a) | datepart(hour, a) | - | 小时 | -| a.Millisecond | floor(microsecond(a) / 1000) | datepart(millisecond, a) | - | 毫秒 | -| a.Minute | minute(a) | datepart(minute, a) | - | 分钟 | -| a.Month | month(a) | datepart(month, a) | - | 月 | -| a.Second | second(a) | datepart(second, a) | - | 秒 | -| a.Subtract(b) | timestampdiff(microsecond, b, a) | datediff(millisecond, b, a) * 1000 | - | 将a的值和b相减 | -| a.Ticks | timestampdiff(microsecond, '0001-1-1', a) * 10 | datediff(millisecond, '1970-1-1', a) * 10000 + 621355968000000000 | - | 刻度总数 | -| a.TimeOfDay | timestampdiff(microsecond, date_format(a, '%Y-%m-%d'), a) | '1970-1-1 ' + convert(varchar, a, 14) | - | 获取a的时间部分 | -| a.Year | year(a) | datepart(year, a) | - | 年 | -| a.Equals(b) | a = b | a = b | - | 比较a和b相等 | -| a.CompareTo(b) | a - b | a - b | - | 比较a和b大小 | -| a.ToString() | date_format(a, '%Y-%m-%d %H:%i:%s.%f') | convert(varchar, a, 121) | - | 转换字符串 | +var t5 = fsql.Update().SetSource(item) + .IgnoreColumns(a => new { a.Clicks, a.CreateTime }).ToSql(); +//UPDATE `tb_topic` SET `Title` = ?p_0 WHERE (`Id` = 1) +``` +### 批量保存 +```csharp +var items = new List(); +for (var a = 0; a < 10; a++) + items.Add(new Topic { Id = a + 1, Title = $"newtitle{a}", Clicks = a * 100 }); -### 时间对象 -| 表达式 | MySql(微秒) | SqlServer(秒) | PostgreSQL | 功能说明 | -| - | - | - | - | - | -| TimeSpan.Zero | 0 | 0 | - | 0微秒 | -| TimeSpan.MaxValue | 922337203685477580 | 922337203685477580 | - | 最大微秒时间 | -| TimeSpan.MinValue | -922337203685477580 | -922337203685477580 | - | 最小微秒时间 | -| TimeSpan.Compare(a, b) | a - b | a - b | - | 比较a和b的大小 | -| TimeSpan.Equals(a, b) | a = b | a = b | - | 比较a和b相等 | -| TimeSpan.FromDays(a) | a * 1000000 * 60 * 60 * 24 | a * 1000000 * 60 * 60 * 24 | - | a天的微秒值 | -| TimeSpan.FromHours(a) | a * 1000000 * 60 * 60 | a * 1000000 * 60 * 60 | - | a小时的微秒值 | -| TimeSpan.FromMilliseconds(a) | a * 1000 | a * 1000 | - | a毫秒的微秒值 | -| TimeSpan.FromMinutes(a) | a * 1000000 * 60 | a * 1000000 * 60 | - | a分钟的微秒值 | -| TimeSpan.FromSeconds(a) | a * 1000000 | a * 1000000 | - | a秒钟的微秒值 | -| TimeSpan.FromTicks(a) | a / 10 | a / 10 | - | a刻度的毫秒值 | -| a.Add(b) | a + b | a + b | - | 增加值 | -| a.Subtract(b) | a - b | a - b | - | 将a的值和b相减 | -| a.CompareTo(b) | a - b | a - b | - | 比较a和b大小 | -| a.Days | a div (1000000 * 60 * 60 * 24) | a div (1000000 * 60 * 60 * 24) | - | 天数部分 | -| a.Hours | a div (1000000 * 60 * 60) mod 24 | a div (1000000 * 60 * 60) mod 24 | - | 小时部分 | -| a.Milliseconds | a div 1000 mod 1000 | a div 1000 mod 1000 | - | 毫秒部分 | -| a.Seconds | a div 1000000 mod 60 | a div 1000000 mod 60 | - | 秒数部分 | -| a.Ticks | a * 10 | a * 10 | - | 刻度总数 | -| a.TotalDays | a / (1000000 * 60 * 60 * 24) | a / (1000000 * 60 * 60 * 24) | - | 总天数(含小数) | -| a.TotalHours | a / (1000000 * 60 * 60) | a / (1000000 * 60 * 60) | - | 总小时(含小数) | -| a.TotalMilliseconds | a / 1000 | a / 1000 | - | 总毫秒(含小数) | -| a.TotalMinutes | a / (1000000 * 60) | a / (1000000 * 60) | - | 总分钟(含小数) | -| a.TotalSeconds | a / 1000000 | a / 1000000 | - | 总秒数(含小数) | -| a.Equals(b) | a = b | a = b | - | 比较a和b相等 | -| a.ToString() | cast(a as varchar) | cast(a as varchar) | - | 转换字符串 | +var t6 = fsql.Update().SetSource(items).ToSql(); +//UPDATE `tb_topic` SET `Clicks` = CASE `Id` WHEN 1 THEN ?p_0 WHEN 2 THEN ?p_1 WHEN 3 THEN ?p_2 WHEN 4 THEN ?p_3 WHEN 5 THEN ?p_4 WHEN 6 THEN ?p_5 WHEN 7 THEN ?p_6 WHEN 8 THEN ?p_7 WHEN 9 THEN ?p_8 WHEN 10 THEN ?p_9 END, `Title` = CASE `Id` WHEN 1 THEN ?p_10 WHEN 2 THEN ?p_11 WHEN 3 THEN ?p_12 WHEN 4 THEN ?p_13 WHEN 5 THEN ?p_14 WHEN 6 THEN ?p_15 WHEN 7 THEN ?p_16 WHEN 8 THEN ?p_17 WHEN 9 THEN ?p_18 WHEN 10 THEN ?p_19 END, `CreateTime` = CASE `Id` WHEN 1 THEN ?p_20 WHEN 2 THEN ?p_21 WHEN 3 THEN ?p_22 WHEN 4 THEN ?p_23 WHEN 5 THEN ?p_24 WHEN 6 THEN ?p_25 WHEN 7 THEN ?p_26 WHEN 8 THEN ?p_27 WHEN 9 THEN ?p_28 WHEN 10 THEN ?p_29 END WHERE (`Id` IN (1,2,3,4,5,6,7,8,9,10)) +``` +### 批量保存，忽略一些列 +```csharp +var t7 = fsql.Update().SetSource(items) + .IgnoreColumns(a => new { a.Clicks, a.CreateTime }).ToSql(); +//UPDATE `tb_topic` SET `Title` = CASE `Id` WHEN 1 THEN ?p_0 WHEN 2 THEN ?p_1 WHEN 3 THEN ?p_2 WHEN 4 THEN ?p_3 WHEN 5 THEN ?p_4 WHEN 6 THEN ?p_5 WHEN 7 THEN ?p_6 WHEN 8 THEN ?p_7 WHEN 9 THEN ?p_8 WHEN 10 THEN ?p_9 END WHERE (`Id` IN (1,2,3,4,5,6,7,8,9,10)) +``` +### 批量更新指定列 +```csharp +var t8 = fsql.Update().SetSource(items).Set(a => a.CreateTime, DateTime.Now).ToSql(); +//UPDATE `tb_topic` SET `CreateTime` = ?p_0 WHERE (`Id` IN (1,2,3,4,5,6,7,8,9,10)) +``` +### 更新条件 +```csharp +fsql.Update(object dywhere) +``` +dywhere 支持 +* 主键值 +* new[] { 主键值1, 主键值2 } +* Topic对象 +* new[] { Topic对象1, Topic对象2 } +* new { id = 1 } +```csharp +var t9 = fsql.Update().Set(a => a.Title, "新标题").Where(a => a.Id == 1).ToSql(); +//UPDATE `tb_topic` SET `Title` = '新标题' WHERE (Id = 1) +``` +### 自定义SQL +```csharp +var t10 = fsql.Update().SetRaw("Title = {0}", "新标题").Where("Id = {0}", 1).ToSql(); +//UPDATE `tb_topic` SET Title = '新标题' WHERE (Id = 1) +//sql语法条件，参数使用 {0}，与 string.Format 保持一致，无须加单引号，错误的用法：'{0}' +``` +### 执行命令 +| 方法 | 返回值 | 参数 | 描述 | +| - | - | - | - | +| ExecuteAffrows | long | | 执行SQL语句，返回影响的行数 | +| ExecuteUpdated | List\ | | 执行SQL语句，返回更新后的记录 | -### 数学函数 -| 表达式 | MySql | SqlServer | PostgreSQL | 功能说明 | -| - | - | - | - | - | -| Math.Abs(a) | abs(a) | abs(a) | - | - | -| Math.Acos(a) | acos(a) | acos(a) | - | - | -| Math.Asin(a) | asin(a) | asin(a) | - | - | -| Math.Atan(a) | atan(a) | atan(a) | - | - | -| Math.Atan2(a, b) | atan2(a, b) | atan2(a, b) | - | - | -| Math.Ceiling(a) | ceiling(a) | ceiling(a) | - | - | -| Math.Cos(a) | cos(a) | cos(a) | - | - | -| Math.Exp(a) | exp(a) | exp(a) | - | - | -| Math.Floor(a) | floor(a) | floor(a) | - | - | -| Math.Log(a) | log(a) | log(a) | - | - | -| Math.Log10(a) | log10(a) | log10(a) | - | - | -| Math.PI(a) | 3.1415926535897931 | 3.1415926535897931 | - | - | -| Math.Pow(a, b) | pow(a, b) | power(a, b) | - | - | -| Math.Round(a, b) | round(a, b) | round(a, b) | - | - | -| Math.Sign(a) | sign(a) | sign(a) | - | - | -| Math.Sin(a) | sin(a) | sin(a) | - | - | -| Math.Sqrt(a) | sqrt(a) | sqrt(a) | - | - | -| Math.Tan(a) | tan(a) | tan(a) | - | - | -| Math.Truncate(a) | truncate(a, 0) | floor(a) | - | - | - -### 类型转换 -| 表达式 | MySql | SqlServer | PostgreSQL | 功能说明 | -| - | - | - | - | - | -| Convert.ToBoolean(a) | (a not in ('0','false)) | - | - | - | -| Convert.ToByte | cast(a as unsigned) | - | - | - | -| Convert.ToChar | substr(cast(a as char),1,1) | - | - | - | -| Convert.ToDateTime | cast(a as datetime) | - | - | - | -| Convert.ToDecimal | cast(a as decimal(36,18)) | - | - | - | -| Convert.ToDouble | cast(a as decimal(32,16)) | - | - | - | -| Convert.ToInt16 | cast(a as signed) | - | - | - | -| Convert.ToInt32 | cast(a as signed) | - | - | - | -| Convert.ToInt64 | cast(a as signed) | - | - | - | -| Convert.ToSByte | cast(a as signed) | - | - | - | -| Convert.ToSingle | cast(a as char) | - | - | - | -| Convert.ToString | cast(a as decimal(14,7)) | - | - | - | -| Convert.ToUInt16 | cast(a as unsigned) | - | - | - | -| Convert.ToUInt32 | cast(a as unsigned) | - | - | - | -| Convert.ToUInt64 | cast(a as unsigned) | - | - | - | +# Part4: 删除 +详情查看：[《Delete 删除数据》](Docs/delete.md) +# Part4: 表达式函数 +详情查看：[《Expression 表达式函数》](Docs/expression.md) # 更多文档整理中。。。