mysql - Issue with sql query in GO -

-

i have simple mysql table, 3 columns, a, b , c.

a , b keys.

i have go app , i'm trying retrieve data db. other queries works charm, 1 doesn't:

aparam := "avalue" bparam := "3,4,6,9" stmt, err := o.database.prepare("select * tablex `a`= ? , `b` in ( ? )") defer stmt.close() rows, err := stmt.query(aparam, bparam) rows.next() { ... }

if replace second ? values, works perfect:

stmt, err := o.database.prepare("select * tablex `a`= ? , `b` in ( 3,4,6,9 )")

i tried (it doesn't work):

stmt, err := o.database.prepare("select * tablex `a`= ? , `b` in ( " + bparam +" )")

any idea?

the issue single ? not expanded select statement (like string replace), single string value 3,4,5,6

you need expand each value of in clause such:

params := []interface{} { "avalue", 3, 4, 6, 9 } stmt, err := o.database.prepare("select * tablex `a`= ? , `b` in ( ?, ?, ?, ? )") defer stmt.close() rows, err := stmt.query(params...)

to make life easier, can use package sqlx, has better support parameterized in queries


Comments

Post a Comment

Popular posts from this blog

html - Firefox flex bug applied to buttons? -

-
i'm trying apply flex button on firefox i'm having problem on chrome doesn't happens. this css: .button { display: inline-flex; align-items: center; } as can see in fiddle, "caret" word moved new line, happens if element <button> tag, <div> works expected. http://codepen.io/anon/pen/xblmgx is firefox bug or there css i'm missing? nevermind, looks "mr firefox" doesn't idea... <button> not implementable (by browsers) in pure css, bit of black box, perspective of css. means don't react in same way e.g. <div> would. this isn't specific flexbox -- e.g. don't render scrollbars if put "overflow:scroll" on button, , don't render table if put "display:table" on it. stepping further, isn't specific <button> . consider <fieldset> , <table> have special rendering behavior: data:text/html,<fieldset style="d
Read more

html - Missing border-right in select on Firefox -

-
Image
when put select div width , padding-left, options have no border on right. more, happend if select have width 118px , parent have 15px of padding left! have idea, going on? my code: <!doctype html> <html> <head lang="en"> </head> <body> <div style="width: 1000px; padding-left: 15px;"> <select style="width: 118px;"> <option>a</option> <option>b</option> <option>c</option> </select> </div> </body> </html> and result: here plunker: click it happend on firefox on windows. tested on 40.0.2 version -webkit-box-sizing: border-box; -moz-box-sizing: border-box; -ms-box-sizing: border-box; box-sizing: border-box; source: https://stackoverflow.com/a/11390432/4431269 source of problem: https://bugzilla.mozilla.org/show_bug.cgi?id=924068 and use of google ! edit: (source of problem, explained) after rea
Read more

c# - two queries in same method -

-
i trying execute 2 queries in same method gives me exception. can red of exception declaring new command there way use same command? string id="hi"; connection.open(); oledbcommand command1 = new oledbcommand(); command1.connection = connection; string query1 = "select * products category='" + combobox1.text + "' , subcategory = '" + combobox2.text + "' , sizes='" + combobox3.text + "'"; command1.commandtext = query1; oledbdatareader reader = command1.executereader(); while (reader.read()) { id = reader[0].tostring(); } textbox1.text = id; string query = "insert category_in (category_id,amount,amount_in) values ('"+ id+"' ,500,300)"; command1.commandtext = query; command1.executenonquery(); messagebox.show("saved"); connection.close();
Read more