从数据库中自动生成mvc中的模型类

Question

我听说人们使用实体框架从数据库生成模型相关的类.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.谢谢

Answer 1

我知道这是一个古老的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.

基于这个答案.

    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

Answer 2

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 - >展开已创建*.tt文件组 - >你得到它:-)