如何从SQL Server表对象生成类?
我说的不是使用ORM。我只需要创建实体(简单类)。喜欢的东西:
public class Person
{
public string Name { get;set; }
public string Phone { get;set; }
}
给定一个表，比如:
+----+-------+----------------+
| ID | Name | Phone |
+----+-------+----------------+
| 1 | Alice | (555) 555-5550 |
| 2 | Bob | (555) 555-5551 |
| 3 | Cathy | (555) 555-5552 |
+----+-------+----------------+
当前回答
Java类生成
declare @TableName varchar(max) = 'Restaurants'
declare @Templete varchar(max) = '
public @ColumnType @ColumnName ; // @ColumnDesc
public @ColumnType get@ColumnName()
{
return this.@ColumnName;
}
public void set@ColumnName(@ColumnType @ColumnName)
{
this.@ColumnName=@ColumnName;
}
'
declare @before varchar(max)='public class @TableName
{'
declare @after varchar(max)='
}'
declare @result varchar(max)
set @before =replace(@before,'@TableName',@TableName)
set @result=@before
select @result = @result
+ replace(replace(replace(replace(replace(@Templete,'@ColumnType',ColumnType) ,'@ColumnName',ColumnName) ,'@ColumnDesc',ColumnDesc),'@ISPK',ISPK),'@max_length',max_length)
from
(
select
column_id,
replace(col.name, ' ', '_') ColumnName,
typ.name as sqltype,
typ.max_length,
is_identity,
pkk.ISPK,
case typ.name
when 'bigint' then 'long'
when 'binary' then 'byte[]'
when 'bit' then 'bool'
when 'char' then 'String'
when 'date' then 'DateTime'
when 'datetime' then 'DateTime'
when 'datetime2' then 'DateTime'
when 'datetimeoffset' then 'DateTimeOffset'
when 'decimal' then 'decimal'
when 'float' then 'float'
when 'image' then 'byte[]'
when 'int' then 'int'
when 'money' then 'decimal'
when 'nchar' then 'char'
when 'ntext' then 'string'
when 'numeric' then 'decimal'
when 'nvarchar' then 'String'
when 'real' then 'double'
when 'smalldatetime' then 'DateTime'
when 'smallint' then 'short'
when 'smallmoney' then 'decimal'
when 'text' then 'String'
when 'time' then 'TimeSpan'
when 'timestamp' then 'DateTime'
when 'tinyint' then 'byte'
when 'uniqueidentifier' then 'Guid'
when 'varbinary' then 'byte[]'
when 'varchar' then 'string'
else 'UNKNOWN_' + typ.name
END + CASE WHEN col.is_nullable=1 AND typ.name NOT IN ('binary', 'varbinary', 'image', 'text', 'ntext', 'varchar', 'nvarchar', 'char', 'nchar') THEN '?' ELSE '' END ColumnType,
isnull(colDesc.colDesc,'') AS ColumnDesc
from sys.columns col
join sys.types typ on
col.system_type_id = typ.system_type_id AND col.user_type_id = typ.user_type_id
left join
(
SELECT c.name AS 'ColumnName', CASE WHEN dd.pk IS NULL THEN 'false' ELSE 'true' END ISPK
FROM sys.columns c
JOIN sys.tables t ON c.object_id = t.object_id
LEFT JOIN (SELECT K.COLUMN_NAME , C.CONSTRAINT_TYPE as pk
FROM INFORMATION_SCHEMA.KEY_COLUMN_USAGE AS K
LEFT JOIN INFORMATION_SCHEMA.TABLE_CONSTRAINTS AS C
ON K.TABLE_NAME = C.TABLE_NAME
AND K.CONSTRAINT_NAME = C.CONSTRAINT_NAME
AND K.CONSTRAINT_CATALOG = C.CONSTRAINT_CATALOG
AND K.CONSTRAINT_SCHEMA = C.CONSTRAINT_SCHEMA
WHERE K.TABLE_NAME = @TableName) as dd
ON dd.COLUMN_NAME = c.name
WHERE t.name = @TableName
) pkk on ColumnName=col.name
OUTER APPLY (
SELECT TOP 1 CAST(value AS NVARCHAR(max)) AS colDesc
FROM
sys.extended_properties
WHERE
major_id = col.object_id
AND
minor_id = COLUMNPROPERTY(major_id, col.name, 'ColumnId')
) colDesc
where object_id = object_id(@TableName)
) t
set @result=@result+@after
select @result
--print @result
其他回答
我将几个基于SQL的答案(主要是Alex Aza的根答案)打包到kassify中，这是一个控制台应用程序，可以一次性为指定的数据库生成所有类:
例如，给定一个Users表，它是这样的:
+----+------------------+-----------+---------------------+
| Id | Name | Username | Email |
+----+------------------+-----------+---------------------+
| 1 | Leanne Graham | Bret | Sincere@april.biz |
| 2 | Ervin Howell | Antonette | Shanna@melissa.tv |
| 3 | Clementine Bauch | Samantha | Nathan@yesenia.net |
+----+------------------+-----------+---------------------+
klassify将生成一个名为Users.cs的文件，看起来像这样:
public class User
{
public int Id {get; set; }
public string Name { get;set; }
public string Username { get; set; }
public string Email { get; set; }
}
它将为每个表输出一个文件。丢弃你不用的东西。
使用
--out, -o:
output directory << defaults to the current directory >>
--user, -u:
sql server user id << required >>
--password, -p:
sql server password << required >>
--server, -s:
sql server << defaults to localhost >>
--database, -d:
sql database << required >>
--timeout, -t:
connection timeout << defaults to 30 >>
--help, -h:
show help
Oracle DB的另一个解决方案-> c#
单查询 无功能无步骤 Mulitple表
添加DataAnnotations
(例子) (需要) (表) (StringLength) (列) 可以为空
查询
https://gist.github.com/omansak/f19eefffd2d639ac72a1f4b506d8471a
输出
[Table("AGENTS")]
public class Agents
{
[Key]
[Required]
[Column("INT_ID", TypeName = "NUMBER(10,0)", Order = 1)]
public long IntId { get; set; }
[Key]
[Required]
[StringLength(15)]
[Column("REFERENCE_CODE", TypeName = "VARCHAR2(15)", Order = 2)]
public string ReferenceCode { get; set; }
[Required]
[Column("PARENT_INT_ID", TypeName = "NUMBER(10,0)", Order = 3)]
public long ParentIntId { get; set; }
[Required]
[StringLength(200)]
[Column("TITLE", TypeName = "VARCHAR2(200)", Order = 4)]
public string Title { get; set; }
[Required]
[Column("START_DATE", TypeName = "DATE", Order = 5)]
public DateTime StartDate { get; set; }
[Required]
[Column("END_DATE", TypeName = "DATE", Order = 6)]
public DateTime EndDate { get; set; }
[Required]
[StringLength(1)]
[Column("AGENT_TYPE", TypeName = "VARCHAR2(1)", Order = 7)]
public string AgentType { get; set; }
[Required]
[Column("CREATE_DATE", TypeName = "DATE", Order = 8)]
public DateTime CreateDate { get; set; }
[Required]
[StringLength(32)]
[Column("CREATE_USER", TypeName = "VARCHAR2(32)", Order = 9)]
public string CreateUser { get; set; }
[StringLength(200)]
[Column("RESPONSIBLE_CONTACT", TypeName = "VARCHAR2(200)", Order = 10)]
public string ResponsibleContact { get; set; }
[StringLength(100)]
[Column("RESPONSIBLE_TITLE", TypeName = "VARCHAR2(100)", Order = 11)]
public string ResponsibleTitle { get; set; }
[StringLength(100)]
[Column("AGENCY_PLATE_NO", TypeName = "VARCHAR2(100)", Order = 12)]
public string AgencyPlateNo { get; set; }
[Column("AGENCY_COVER_AMOUNT", TypeName = "NUMBER(24,2)", Order = 13)]
public double? AgencyCoverAmount { get; set; }
[StringLength(100)]
[Column("MERSIS_NO", TypeName = "VARCHAR2(100)", Order = 14)]
public string MersisNo { get; set; }
[StringLength(100)]
[Column("TECH_PERSONEL_NO", TypeName = "VARCHAR2(100)", Order = 15)]
public string TechPersonelNo { get; set; }
[StringLength(100)]
[Column("TECH_PERSONEL_NAME", TypeName = "VARCHAR2(100)", Order = 16)]
public string TechPersonelName { get; set; }
[Column("COVER_END_DATE", TypeName = "DATE", Order = 17)]
public DateTime? CoverEndDate { get; set; }
[Column("BRANCH_NUMBER", TypeName = "NUMBER(10,0)", Order = 18)]
public long? BranchNumber { get; set; }
[Column("ACTION_NUMBER", TypeName = "NUMBER(10,0)", Order = 19)]
public long? ActionNumber { get; set; }
[Column("CLUB_PARTICIPATION_COUNT", TypeName = "NUMBER(10,0)", Order = 20)]
public long? ClubParticipationCount { get; set; }
[Column("AGENCY_CONTRACT_DATE", TypeName = "DATE", Order = 21)]
public DateTime? AgencyContractDate { get; set; }
[StringLength(200)]
[Column("KEP_ADDRESS", TypeName = "VARCHAR2(200)", Order = 22)]
public string KepAddress { get; set; }
}
使用模板创建自定义代码
create PROCEDURE [dbo].[createCode]
(
@TableName sysname = '',
@befor varchar(max)='public class @TableName
{',
@templet varchar(max)='
public @ColumnType @ColumnName { get; set; } // @ColumnDesc ',
@after varchar(max)='
}'
)
AS
BEGIN
declare @result varchar(max)
set @befor =replace(@befor,'@TableName',@TableName)
set @result=@befor
select @result = @result
+ replace(replace(replace(replace(replace(@templet,'@ColumnType',ColumnType) ,'@ColumnName',ColumnName) ,'@ColumnDesc',ColumnDesc),'@ISPK',ISPK),'@max_length',max_length)
from
(
select
column_id,
replace(col.name, ' ', '_') ColumnName,
typ.name as sqltype,
typ.max_length,
is_identity,
pkk.ISPK,
case typ.name
when 'bigint' then 'long'
when 'binary' then 'byte[]'
when 'bit' then 'bool'
when 'char' then 'String'
when 'date' then 'DateTime'
when 'datetime' then 'DateTime'
when 'datetime2' then 'DateTime'
when 'datetimeoffset' then 'DateTimeOffset'
when 'decimal' then 'decimal'
when 'float' then 'float'
when 'image' then 'byte[]'
when 'int' then 'int'
when 'money' then 'decimal'
when 'nchar' then 'char'
when 'ntext' then 'string'
when 'numeric' then 'decimal'
when 'nvarchar' then 'String'
when 'real' then 'double'
when 'smalldatetime' then 'DateTime'
when 'smallint' then 'short'
when 'smallmoney' then 'decimal'
when 'text' then 'String'
when 'time' then 'TimeSpan'
when 'timestamp' then 'DateTime'
when 'tinyint' then 'byte'
when 'uniqueidentifier' then 'Guid'
when 'varbinary' then 'byte[]'
when 'varchar' then 'string'
else 'UNKNOWN_' + typ.name
END + CASE WHEN col.is_nullable=1 AND typ.name NOT IN ('binary', 'varbinary', 'image', 'text', 'ntext', 'varchar', 'nvarchar', 'char', 'nchar') THEN '?' ELSE '' END ColumnType,
isnull(colDesc.colDesc,'') AS ColumnDesc
from sys.columns col
join sys.types typ on
col.system_type_id = typ.system_type_id AND col.user_type_id = typ.user_type_id
left join
(
SELECT c.name AS 'ColumnName', CASE WHEN dd.pk IS NULL THEN 'false' ELSE 'true' END ISPK
FROM sys.columns c
JOIN sys.tables t ON c.object_id = t.object_id
LEFT JOIN (SELECT K.COLUMN_NAME , C.CONSTRAINT_TYPE as pk
FROM INFORMATION_SCHEMA.KEY_COLUMN_USAGE AS K
LEFT JOIN INFORMATION_SCHEMA.TABLE_CONSTRAINTS AS C
ON K.TABLE_NAME = C.TABLE_NAME
AND K.CONSTRAINT_NAME = C.CONSTRAINT_NAME
AND K.CONSTRAINT_CATALOG = C.CONSTRAINT_CATALOG
AND K.CONSTRAINT_SCHEMA = C.CONSTRAINT_SCHEMA
WHERE K.TABLE_NAME = @TableName) as dd
ON dd.COLUMN_NAME = c.name
WHERE t.name = @TableName
) pkk on ColumnName=col.name
OUTER APPLY (
SELECT TOP 1 CAST(value AS NVARCHAR(max)) AS colDesc
FROM
sys.extended_properties
WHERE
major_id = col.object_id
AND
minor_id = COLUMNPROPERTY(major_id, col.name, 'ColumnId')
) colDesc
where object_id = object_id(@TableName)
) t
set @result=@result+@after
select @result
--print @result
END
现在创建自定义代码
例如c#类
exec [createCode] @TableName='book',@templet ='
public @ColumnType @ColumnName { get; set; } // @ColumnDesc '
输出是
public class book
{
public long ID { get; set; } //
public String Title { get; set; } // Book Title
}
对LINQ
exec [createCode] @TableName='book'
, @befor ='[System.Data.Linq.Mapping.Table(Name = "@TableName")]
public class @TableName
{',
@templet ='
[System.Data.Linq.Mapping.Column(Name = "@ColumnName", IsPrimaryKey = @ISPK)]
public @ColumnType @ColumnName { get; set; } // @ColumnDesc
' ,
@after ='
}'
输出是
[System.Data.Linq.Mapping.Table(Name = "book")]
public class book
{
[System.Data.Linq.Mapping.Column(Name = "ID", IsPrimaryKey = true)]
public long ID { get; set; } //
[System.Data.Linq.Mapping.Column(Name = "Title", IsPrimaryKey = false)]
public String Title { get; set; } // Book Title
}
Java类
exec [createCode] @TableName='book',@templet ='
public @ColumnType @ColumnName ; // @ColumnDesc
public @ColumnType get@ColumnName()
{
return this.@ColumnName;
}
public void set@ColumnName(@ColumnType @ColumnName)
{
this.@ColumnName=@ColumnName;
}
'
输出是
public class book
{
public long ID ; //
public long getID()
{
return this.ID;
}
public void setID(long ID)
{
this.ID=ID;
}
public String Title ; // Book Title
public String getTitle()
{
return this.Title;
}
public void setTitle(String Title)
{
this.Title=Title;
}
}
为android sugarOrm模型
exec [createCode] @TableName='book'
, @befor ='@Table(name = "@TableName")
public class @TableName
{',
@templet ='
@Column(name = "@ColumnName")
public @ColumnType @ColumnName ;// @ColumnDesc
' ,
@after ='
}'
输出是
@Table(name = "book")
public class book
{
@Column(name = "ID")
public long ID ;//
@Column(name = "Title")
public String Title ;// Book Title
}
商业化，但codessmith Generator做到了:http://www.codesmithtools.com/product/generator
我很困惑你想要从这里得到什么，但这里是在设计你想要设计的东西时的一般选择。
在Visual Studio版本中使用内置的ORM。 自己编写一个，类似于您的代码示例。通常情况下，如果你不确定怎么做，教程是你最好的朋友。 使用另一种ORM，如NHibernate。
