从数据库中自动生成mvc中的模型类

时间:2013-05-22 08:00:06

标签: c# asp.net-mvc class model

我听说人们使用实体框架从数据库生成与模型相关的类。假设我不想使用实体框架作为数据访问层,而我想使用MS数据应用程序块,那么我如何从数据库中自动生成MVC中的模型类,而不是手动编写模型相关类。请指导我所有可能的方法。感谢

3 个答案:

答案 0 :(得分:5)

这样做的好方法是使用ADO.NET实体数据模型: 在Visual Studio中右键单击您的项目 - > “添加” - > “新项目” - > “数据” - > “ADO.NET实体数据模型” - > “从数据库生成” - >选择或创建连接 - >选择表格 - >展开已创建的* .tt文件组 - >你明白了: - )

答案 1 :(得分:5)

我知道这是一个老问题但是为了快速简单的课程我在短信中使用它。它添加了我经常使用的“必需”和“字符串长度”数据注释。

Based upon this answer.

    DECLARE @TableName VARCHAR(MAX) = 'tablename' -- Replace 'tablename' with your table name
    DECLARE @NameSpace VARCHAR(MAX) = 'namespace' -- Replace 'namespace' with your class namespace
    DECLARE @TableSchema VARCHAR(MAX) = 'dbo' -- Replace 'dbo' with your schema name
    DECLARE @result varchar(max) = ''

    SET @result = @result + 'using System;' + CHAR(13)
    SET @result = @result + 'using System.ComponentModel.DataAnnotations;' + CHAR(13) + CHAR(13) 

    IF (@TableSchema IS NOT NULL) 
    BEGIN
        SET @result = @result + 'namespace ' + @NameSpace  + CHAR(13) + '{' + CHAR(13) 
    END

    SET @result = @result + 'public class ' + @TableName + CHAR(13) + '{' + CHAR(13) 

    SET @result = @result + '#region Instance Properties' + CHAR(13)  

    SELECT @result = @result + CHAR(13)     
        + ' [Display(Name = "' + ColumnName + '")] ' + CHAR(13) 
        + CASE bRequired WHEN 'NO' 
        THEN 
        CASE WHEN Len(MaxLen) > 0 THEN ' [Required, StringLength(' + MaxLen + ')]' + CHAR(13) ELSE ' [Required] ' + CHAR(13)  END   
        ELSE
        CASE WHEN Len(MaxLen) > 0 THEN ' [StringLength(' + MaxLen + ')]' + CHAR(13) ELSE '' END  
        END
        + ' public ' + ColumnType + ' ' + ColumnName + ' { get; set; } ' + CHAR(13) 
    FROM
    (
        SELECT  c.COLUMN_NAME   AS ColumnName 
            , CASE c.DATA_TYPE   
                WHEN 'bigint' THEN
                    CASE C.IS_NULLABLE
                        WHEN 'YES' THEN 'Int64?' ELSE 'Int64' END
                WHEN 'binary' THEN 'Byte[]'
                WHEN 'bit' THEN 
                    CASE C.IS_NULLABLE
                        WHEN 'YES' THEN 'Boolean?' ELSE 'Boolean' END            
                WHEN 'char' THEN 'String'
                WHEN 'date' THEN
                    CASE C.IS_NULLABLE
                        WHEN 'YES' THEN 'DateTime?' ELSE 'DateTime' END                        
                WHEN 'datetime' THEN
                    CASE C.IS_NULLABLE
                        WHEN 'YES' THEN 'DateTime?' ELSE 'DateTime' END                        
                WHEN 'datetime2' THEN  
                    CASE C.IS_NULLABLE
                        WHEN 'YES' THEN 'DateTime?' ELSE 'DateTime' END                        
                WHEN 'datetimeoffset' THEN 
                    CASE C.IS_NULLABLE
                        WHEN 'YES' THEN 'DateTimeOffset?' ELSE 'DateTimeOffset' END                                    
                WHEN 'decimal' THEN  
                    CASE C.IS_NULLABLE
                        WHEN 'YES' THEN 'Decimal?' ELSE 'Decimal' END                                    
                WHEN 'float' THEN 
                    CASE C.IS_NULLABLE
                        WHEN 'YES' THEN 'Single?' ELSE 'Single' END                                    
                WHEN 'image' THEN 'Byte[]'
                WHEN 'int' THEN  
                    CASE C.IS_NULLABLE
                        WHEN 'YES' THEN 'Int32?' ELSE 'Int32' END
                WHEN 'money' THEN
                    CASE C.IS_NULLABLE
                        WHEN 'YES' THEN 'Decimal?' ELSE 'Decimal' END                                                
                WHEN 'nchar' THEN 'String'
                WHEN 'ntext' THEN 'String'
                WHEN 'numeric' THEN
                    CASE C.IS_NULLABLE
                        WHEN 'YES' THEN 'Decimal?' ELSE 'Decimal' END                                                            
                WHEN 'nvarchar' THEN 'String'
                WHEN 'real' THEN 
                    CASE C.IS_NULLABLE
                        WHEN 'YES' THEN 'Double?' ELSE 'Double' END                                                                        
                WHEN 'smalldatetime' THEN 
                    CASE C.IS_NULLABLE
                        WHEN 'YES' THEN 'DateTime?' ELSE 'DateTime' END                                    
                WHEN 'smallint' THEN 
                    CASE C.IS_NULLABLE
                        WHEN 'YES' THEN 'Int16?' ELSE 'Int16'END            
                WHEN 'smallmoney' THEN  
                    CASE C.IS_NULLABLE
                        WHEN 'YES' THEN 'Decimal?' ELSE 'Decimal' END                                                                        
                WHEN 'text' THEN 'String'
                WHEN 'time' THEN 
                    CASE C.IS_NULLABLE
                        WHEN 'YES' THEN 'TimeSpan?' ELSE 'TimeSpan' END                                                                                    
                WHEN 'timestamp' THEN 
                    CASE C.IS_NULLABLE
                        WHEN 'YES' THEN 'DateTime?' ELSE 'DateTime' END                                    
                WHEN 'tinyint' THEN 
                    CASE C.IS_NULLABLE
                        WHEN 'YES' THEN 'Byte?' ELSE 'Byte' END                                                
                WHEN 'uniqueidentifier' THEN 'Guid'
                WHEN 'varbinary' THEN 'Byte[]'
                WHEN 'varchar' THEN 'String'
                ELSE 'Object'
            END AS ColumnType,
                c.IS_NULLABLE AS bRequired,
                CASE c.DATA_TYPE             
                WHEN 'char' THEN  CONVERT(varchar(10),c.CHARACTER_MAXIMUM_LENGTH)
                WHEN 'nchar' THEN  CONVERT(varchar(10),c.CHARACTER_MAXIMUM_LENGTH)
                WHEN 'nvarchar' THEN  CONVERT(varchar(10),c.CHARACTER_MAXIMUM_LENGTH)
                WHEN 'varchar' THEN  CONVERT(varchar(10),c.CHARACTER_MAXIMUM_LENGTH)
                ELSE ''
            END AS MaxLen,
            c.ORDINAL_POSITION 
    FROM    INFORMATION_SCHEMA.COLUMNS c
    WHERE   c.TABLE_NAME = @TableName and ISNULL(@TableSchema, c.TABLE_SCHEMA) = c.TABLE_SCHEMA  
    ) t
    ORDER BY t.ORDINAL_POSITION

    SET @result = @result + CHAR(13) + '#endregion Instance Properties' + CHAR(13)  

    SET @result = @result  + '}' + CHAR(13)

    IF (@TableSchema IS NOT NULL) 
    BEGIN
        SET @result = @result + CHAR(13) + '}' 
    END

    PRINT @result

答案 2 :(得分:0)

在 SqlServerManagementStudio 中运行以下脚本,对于所需的表,您将获得结果...

    declare @TableName sysname = 'tblQuotations'
declare @Result varchar(max) = 'public class ' + @TableName + '
{'

select @Result = @Result + '
    public ' + ColumnType + NullableSign + ' ' + ColumnName + ' { get; set; }
'
from
(
    select 
        replace(col.name, ' ', '_') ColumnName,
        column_id ColumnId,
        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 'string'
            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 ColumnType,
        case 
            when col.is_nullable = 1 and typ.name in ('bigint', 'bit', 'date', 'datetime', 'datetime2', 'datetimeoffset', 'decimal', 'float', 'int', 'money', 'numeric', 'real', 'smalldatetime', 'smallint', 'smallmoney', 'time', 'tinyint', 'uniqueidentifier') 
            then '?' 
            else '' 
        end NullableSign
    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
    where object_id = object_id(@TableName)
) t
order by ColumnId

set @Result = @Result  + '
}'

print @Result