java - "No such column" when running update on SQLite -


i'm trying update row in database. here code trying use update: 

public void addfbcomments(int id){      sqlitedatabase db = this.getwritabledatabase();      string query = "update " + table_fb_feed + " set " + col_fb_comments+"="+"hello" + " " + col_fb_id+"="+id;      db.execsql(query); }

when run command, throws error: 

08-18 15:42:10.145: e/androidruntime(10493): fatal exception: thread-922 08-18 15:42:10.145: e/androidruntime(10493): android.database.sqlite.sqliteexception: no such column: hello (code 1): , while compiling: update fb_feed set fb_comments= hello  _id=3

here table_fb_feed: 

private static final string table_fb_feed_create = "create table " + table_fb_feed +  " ("         + col_fb_id + " integer primary key autoincrement not null,"          + col_fb_message + " text,"          + col_fb_caption + " text,"         + col_fb_poster_id + " text,"         + col_fb_post_id + " text,"         + col_fb_likes + " text,"         + col_fb_poster_name + " text,"         + col_fb_comments + " text," // column want update         + col_fb_likes_num + " text,"         + col_fb_timestamp + " text,"         + col_fb_profile_picture_uri + " text,"         + col_fb_picture_uri + " text,"          + col_fb_name + " text,"          + col_fb_previous_page_uri + " text,"         + col_fb_next_page_uri + " text,"          + col_fb_post_type + " text,"          + col_fb_link_name + " text,"          + col_fb_comments_num + " text,"          + col_fb_story + " text,"          + col_fb_description + " text,"         + col_fb_comments_before + " text,"         + col_fb_comments_after + " text,"         + col_fb_likes_profile_pic + " text,"         + col_fb_comments_profile_pic + " text);";

why throwing query? thought doing correctly.

in code need add single quotes:

string query = "update " + table_fb_feed + " set " + col_fb_comments     +"="+"'hello'" + " " + col_fb_id+"="+id

or

string query = "update " + table_fb_feed + " set " + col_fb_comments     +"='hello' " + col_fb_id+"="+id

this example

"update db_table set your_column='newvalue' id=myidvalue");

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