Generate C# .NET Classes of entire database through SQL Scripts Automatically

Let's learn how to generate C# Classes from SQL Scripts. Generate C# classes automatically for the entire database.

Step 1: Copy the query below and run it in the SQL Editor (New Query).
Step 2: Pass the table name as a parameter and run the query.

You can find the entire class in the output below.

DECLARE @TableName sysname = '' 
DECLARE @objectId int=1

      WHILE EXISTS (select 1 from sys.objects where type='U' and 
					name!='__RefactorLog' and object_id > @objectId)
      BEGIN          
        SELECT @objectId = MIN(object_id) FROM sys.objects 
					WHERE TYPE='U' and NAME!='__RefactorLog' 
					AND object_id > @objectId    
		
		SET @TableName=(SELECT NAME FROM sys.objects WHERE object_id=@objectId)

DECLARE @Output VARCHAR(MAX) = 'public class ' + @TableName + '
{'
SELECT @Output = @Output + ' 
	public ' + ColumnType + NullSign + ' ' + 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 'double'
            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 'float'
            WHEN 'smalldatetime' THEN 'DateTime'
            WHEN 'smallint' THEN 'short'
            WHEN 'smallmoney' THEN 'decimal'
            WHEN 'text' THEN 'string'
            WHEN 'time' THEN 'TimeSpan'
            WHEN 'timestamp' THEN 'long'
            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 NullSign
    FROM sys.columns col
        INNER 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)

) temp
order by ColumnId
set @Output = @Output  + '

}'
print @Output
END

Here is the output

If you want to generate the classes of a specific table then follow the below article.

Generate Class of Specific Table

I hope you like this article.