Mysql workbench error in my function

Question

1.00/5 (2 votes)

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My sql workbench code as follows

Database Mysql workbench

CREATE FUNCTION fn_parsehtml
(
p_htmldesc longtext
)
returns longtext
begin
declare v_first int; declare v_last int; declare v_len int;
set v_first = instr('<',p_htmldesc);
set v_last = instr('>',p_htmldesc,instr('<',p_htmldesc));
set v_len = (v_last - v_first) + 1;
while v_first > 0 AND v_last > 0 AND v_len > 0
do
-- -Stuff function is used to insert string at given position and delete number of characters specified from original string
set p_htmldesc = INSERT(p_htmldesc,v_first,v_len,'');
SET v_first = instr('<',p_htmldesc);
set v_last = instr('>',p_htmldesc,instr('<',p_htmldesc));
set v_len = (v_last - v_first) + 1;
end while;
return LTRIM(RTRIM(p_htmldesc));
end;

when i execute shows error as follows

Error Code: 1582. Incorrect parameter count in the call to native function 'instr'

What I have tried:

My sql workbench code as follows

Database Mysql workbench

CREATE FUNCTION fn_parsehtml
(
p_htmldesc longtext
)
returns longtext
begin
declare v_first int; declare v_last int; declare v_len int;
set v_first = instr('<',p_htmldesc);
set v_last = instr('>',p_htmldesc,instr('<',p_htmldesc));
set v_len = (v_last - v_first) + 1;
while v_first > 0 AND v_last > 0 AND v_len > 0
do
-- -Stuff function is used to insert string at given position and delete number of characters specified from original string
set p_htmldesc = INSERT(p_htmldesc,v_first,v_len,'');
SET v_first = instr('<',p_htmldesc);
set v_last = instr('>',p_htmldesc,instr('<',p_htmldesc));
set v_len = (v_last - v_first) + 1;
end while;
return LTRIM(RTRIM(p_htmldesc));
end;

when i execute shows error as follows

Error Code: 1582. Incorrect parameter count in the call to native function 'instr'

Posted 12-Dec-17 23:16pm

sudhakarthikeyan

Updated 12-Dec-17 23:33pm

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Jochen Arndt · Answer 1 · 2017-12-12T23:22:00

The error message is quite clear:
There are more or less parameters than allowed for the function instr.

Have a look at the function documentation: MySQL :: MySQL 5.7 Reference Manual :: 12.5 String Functions[^]: instr requires two parameters.

But you are passing three here:

SQL

set v_last = instr('>',p_htmldesc,instr('<',p_htmldesc));

[EDIT]
You probably want to use

SQL

set v_first = instr(p_htmldesc, '<');
set v_last = instr(p_htmldesc, '>');

instead. Note also that the first parameter is the full string and the second the substring to be searched for. So you have to exchange the parameters compared to your code.
[/EDIT]