Conversão de Stored Procedure SQLServer -> MySQL

[Ramon Rocha]

Galera,

Tenho esta SP no SQL Server:

CREATE PROCEDURE GG_SP_MANAGER_USUARIOS_GETDATAGRID 
@DataForPage AS Int, 
@CurrentPage AS Int, 
@WhereClause AS Varchar(255), 
@SortField AS Varchar(255)
AS 

DECLARE @COUNTER AS Int 
SET @COUNTER = (SELECT COUNT(GG_MANAGER_USUARIOS.Usuario) FROM GG_MANAGER_USUARIOS) 

IF @DataForPage = 0
    SET @DataForPage = 10

IF @CurrentPage = 0
    SET @CurrentPage = 1

DECLARE @SQLStatement varchar(8000) 
SET @SQLStatement ='' +
    'SELECT    ' +
        'Usuario, ' +
        'Nome, ' +
        'Sobrenome, ' +
        'Email, ' +
        'Senha, ' +
        'Telefone, ' +
        'DataCad, ' +
        'DataAlt, ' +
        'DataVisita, ' +
        'Visitas, ' +
        'Ip, ' +
        'Grupo, ' +
        'Grupo_Nome, ' +
        'Liberado ' +
    'FROM (' +
        'SELECT    ' +
            'GG_MANAGER_USUARIOS.Usuario, ' +
            'GG_MANAGER_USUARIOS.Nome, ' +
            'GG_MANAGER_USUARIOS.Sobrenome, ' +
            'GG_MANAGER_USUARIOS.Email, ' +
            'GG_MANAGER_USUARIOS.Senha, ' +
            'GG_MANAGER_USUARIOS.Telefone, ' +
            'GG_MANAGER_USUARIOS.DataCad, ' +
            'GG_MANAGER_USUARIOS.DataAlt, ' +
            'GG_MANAGER_USUARIOS.DataVisita, ' +
            'GG_MANAGER_USUARIOS.Visitas, ' +
            'GG_MANAGER_USUARIOS.Ip, ' +
            'GG_MANAGER_USUARIOS.Grupo, ' +
            'GG_MANAGER_GRUPOS.Nome AS Grupo_Nome, ' +
            'GG_MANAGER_USUARIOS.Liberado, ' +
            'ROW_NUMBER() OVER(ORDER BY ' + @SortField + ') AS RowNum ' +
        'FROM ' +
            'GG_MANAGER_USUARIOS LEFT OUTER JOIN ' +
            'GG_MANAGER_GRUPOS ON GG_MANAGER_USUARIOS.Grupo = GG_MANAGER_GRUPOS.Grupo' + 
        ') AS RegInfo ' +
    'WHERE ( RowNum BETWEEN ' + CONVERT(nvarchar(10), @CurrentPage) + 
            ' AND (' + CONVERT(nvarchar(10), @CurrentPage) + ' + ' 
            + CONVERT(nvarchar(10), @DataForPage) + ') - 1 )'
IF LEN(@WhereClause) >0
    SET @SQLStatement = @SQLStatement + ' AND ( ' + @WhereClause + ' )'
EXEC(@SQLStatement)

RETURN @COUNTER
GO

Alguém pode me ajudar convertendo para MySQL?

Grato.