Class ColumnFluent

Inheritance
System.Object
ColumnFluent
Inherited Members
System.Object.Equals(System.Object)
System.Object.Equals(System.Object, System.Object)
System.Object.GetHashCode()
System.Object.GetType()
System.Object.MemberwiseClone()
System.Object.ReferenceEquals(System.Object, System.Object)
System.Object.ToString()
Namespace: FreeSql.DataAnnotations
Assembly: FreeSql.dll
Syntax
public class ColumnFluent

Constructors

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ColumnFluent(ColumnAttribute, PropertyInfo, Type)

Declaration
public ColumnFluent(ColumnAttribute column, PropertyInfo property, Type entityType)
Parameters
Type Name Description
ColumnAttribute column
System.Reflection.PropertyInfo property
System.Type entityType

Fields

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_column

Declaration
public ColumnAttribute _column
Field Value
Type Description
ColumnAttribute
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_entityType

Declaration
public Type _entityType
Field Value
Type Description
System.Type
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_property

Declaration
public PropertyInfo _property
Field Value
Type Description
System.Reflection.PropertyInfo

Methods

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CanInsert(Boolean)

该字段是否可以插入，默认值true，指定为false插入时该字段会被忽略

Declaration
public ColumnFluent CanInsert(bool value)
Parameters
Type Name Description
System.Boolean value
Returns
Type Description
ColumnFluent
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CanUpdate(Boolean)

该字段是否可以更新，默认值true，指定为false更新时该字段会被忽略

Declaration
public ColumnFluent CanUpdate(bool value)
Parameters
Type Name Description
System.Boolean value
Returns
Type Description
ColumnFluent
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DbType(String)

数据库类型，如： varchar(255)

Declaration
public ColumnFluent DbType(string value)
Parameters
Type Name Description
System.String value
Returns
Type Description
ColumnFluent
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InsertValueSql(String)

执行 Insert 方法时使用此值

注意：如果是 getdate() 这种请可考虑使用 ServerTime，因为它对数据库间作了适配

Declaration
public ColumnFluent InsertValueSql(string value)
Parameters
Type Name Description
System.String value
Returns
Type Description
ColumnFluent
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IsIdentity(Boolean)

自增标识

Declaration
public ColumnFluent IsIdentity(bool value)
Parameters
Type Name Description
System.Boolean value
Returns
Type Description
ColumnFluent
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IsIgnore(Boolean)

忽略此列，不迁移、不插入

Declaration
public ColumnFluent IsIgnore(bool value)
Parameters
Type Name Description
System.Boolean value
Returns
Type Description
ColumnFluent
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IsNullable(Boolean)

是否可DBNull

Declaration
public ColumnFluent IsNullable(bool value)
Parameters
Type Name Description
System.Boolean value
Returns
Type Description
ColumnFluent
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IsPrimary(Boolean)

主键

Declaration
public ColumnFluent IsPrimary(bool value)
Parameters
Type Name Description
System.Boolean value
Returns
Type Description
ColumnFluent
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IsVersion(Boolean)

乐观锁

Declaration
public ColumnFluent IsVersion(bool value)
Parameters
Type Name Description
System.Boolean value
Returns
Type Description
ColumnFluent
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MapType(Type)

类型映射，比如：可将 enum 属性映射成 typeof(string)

Declaration
public ColumnFluent MapType(Type value)
Parameters
Type Name Description
System.Type value
Returns
Type Description
ColumnFluent
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Name(String)

数据库列名

Declaration
public ColumnFluent Name(string value)
Parameters
Type Name Description
System.String value
Returns
Type Description
ColumnFluent
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OldName(String)

指定数据库旧的列名，修改实体属性命名时，同时设置此参数为修改之前的值，CodeFirst才可以正确修改数据库字段；否则将视为【新增字段】

Declaration
public ColumnFluent OldName(string value)
Parameters
Type Name Description
System.String value
Returns
Type Description
ColumnFluent
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Position(Int16)

创建表时字段位置，规则如下：

>0时排前面

=0时排中间(默认)

<0时排后面

Declaration
public ColumnFluent Position(short value)
Parameters
Type Name Description
System.Int16 value
Returns
Type Description
ColumnFluent
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Precision(Int32, Int32)

decimal/numeric 类型的长度/小数位长度

Declaration
public ColumnFluent Precision(int precision, int scale = 0)
Parameters
Type Name Description
System.Int32 precision

总长度
System.Int32 scale

小数位长度
Returns
Type Description
ColumnFluent
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RereadSql(String)

重读功能

比如：[Column(RereadSql = "{0}.STAsText()")]

查询：SELECT a.[id], a.[geo].STAsText() FROM [table] a

Declaration
public ColumnFluent RereadSql(string value)
Parameters
Type Name Description
System.String value
Returns
Type Description
ColumnFluent
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RewriteSql(String)

重写功能

比如：[Column(RewriteSql = "geography::STGeomFromText({0},4236)")]

插入：INSERT INTO table VALUES(geography::STGeomFromText('...',4236))

提示：更新也生效

Declaration
public ColumnFluent RewriteSql(string value)
Parameters
Type Name Description
System.String value
Returns
Type Description
ColumnFluent
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ServerTime(DateTimeKind)

标记属性为数据库服务器时间(utc/local)，在插入的时候使用类似 getdate() 执行

Declaration
public ColumnFluent ServerTime(DateTimeKind value)
Parameters
Type Name Description
System.DateTimeKind value
Returns
Type Description
ColumnFluent
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StringLength(Int32)

设置长度，针对 string 类型避免 DbType 的繁琐设置

---

StringLength = 100 时，对应 DbType：

MySql -> varchar(100)

SqlServer -> nvarchar(100)

PostgreSQL -> varchar(100)

Oracle -> nvarchar2(100)

Sqlite -> nvarchar(100)

---

StringLength = -1 时，对应 DbType：

MySql -> text

SqlServer -> nvarchar(max)

PostgreSQL -> text

Oracle -> nvarchar2(4000)

Sqlite -> text

Declaration
public ColumnFluent StringLength(int value)
Parameters
Type Name Description
System.Int32 value
Returns
Type Description
ColumnFluent