sql - Conversion failed when converting the nvarchar value to data type int -


do know wrong here?

all variables nvarchar. error occurs when @functionvalue contains int in string format.

if @targettype = 'int' begin     select @sqlstr = 'update ' + @targettable +                          ' set ' + @targetcolumn + ' = ' + coalesce(cast(@functionvalue int), cast(@value int)) +                           ' ' end

the problem ambiguity of + operator. when argument numeric, assumes doing numeric addition, rather string concatenation.

if original data characters, can fix removing cast entirely:

if @targettype = 'int' begin     select @sqlstr = 'update ' + @targettable +                          ' set ' + @targetcolumn + ' = ' + coalesce(@functionvalue, @value) +                           ' ' end;

if original data numeric, need explicitly convert them characters:

if @targettype = 'int' begin     select @sqlstr = 'update ' + @targettable +                          ' set ' + @targetcolumn + ' = ' + cast(cast(coalesce(@functionvalue, @value) int) varchar(255)) +                           ' ' end;

i moved "cast int" outside coalesce().


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