Hi all,
I create a table like this:
"create table tbl1(ID integer primary key, age integer, name text)"
insert a record: "insert into tbl1 values(1,25,'aaa')"
I try to select like this:
sqlite3_prepare(db, "select ?,?,? from tbl1 where ID=1", -1, &stat,
0);
sqlite3_bind_text(stat, 1, "ID", -1, 0);
sqlite3_bind_text(stat, 2, "age", -1, 0);
sqlite3_bind_text(stat, 3, "name", -1, 0);
rc = sqlite3_step(stat);
if (SQLITE_ROW == rc)
{
ID = sqlite3_column_int(stat,0);
age = sqlite3_column_int(stat,1);
name = ........;
}
The return value of sqlite3_step(stat) was SQLITE_ROW, but the values I
got were 0,
why? I think maybe sqlite3_bind() can not bind the column name.
The reson I try to select by "select ?,?,?.. from table where ..." but
not "select * from table where ..."
was follow:
I create a table with 200 columns, and get a total record llke
this:
sqlite3_prepare(db, "select * from tbl1 where ID=id", -1, &stat,
0);
sqlite3_step(stat);
if (SQLITE_ROW == rc) {
.......
...... // get the values
}
I found the time use to get a record does not satisfy the
performance requirement,
the sqlite3_prepare() occupied most of total select time,
so I want to try some other ways to reduce the time of parse SQL
statement.
Are therer some good advices?
Thanks very much!
yoky
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