Escaping single quote in PLSQL

Question

I want PLSQL to generate strings like:

COMMENT ON COLUMN TABLE.COLUMN IS \'comment from database\';

My solution is:

declare         


        

Answer 1

I do this sort stuff a fair bit (usually generating insert/update statements).

You just need to use the replace function to turn all the ' into ''. i.e. Change it to:

str_comment:='COMMENT ON COLUMN '||rec.table_name||'.'||rec.column_name
            ||' IS '''||REPLACE( rec.description,'''','''''')||'''; ' ;

Answer 2

You need to use '' in the code But Before trying it to the actual code ,

try the line which has quotes in the dual

For example:

select '''sumesh''' from dual

Answer 3

Use the REPLACE function in your select.

declare
str_comment varchar2(4000);
begin
for rec in (SELECT table_name, column_name, REPLACE(description, '''', '''''') 
                FROM description_table)
loop
str_comment:='COMMENT ON COLUMN ' || rec.table_name || '.' 
                 ||rec.column_name|| ' IS ''' ||rec.description|| '''; ' ;
dbms_output.put_line(str_comment);
end loop;
end;

Answer 4

You can use the Quote operator like

str_comment:='COMMENT ON COLUMN '||rec.table_name||'.'||rec.column_name||' IS q''[' ||rec.description|| ']'';' ;

see http://psoug.org/reference/string_func.html