Oops -- you're right...I was paying attention to comments and didn't notice the
16 statement that followed it.
Minor documentation boo-boo I guess...
It appears that the "L" produces UTF-32 in Unix and UTF-16 in Windows.
So the code in sqlite3VdbeMemSetStr only copies the "C" in Unix but does the
whole string in Windows.
I put a couple of debug statements in and can see the diff between the two.
I did this:
for(nByte=0; nByte<=iLimit && z[nByte]; nByte++){}
printf("nbyte8=%d\n",nByte);
}else{
for(nByte=0; nByte<=iLimit && (z[nByte] | z[nByte+1]); nByte+=2){}
printf("nbyte!8=%d\n",nByte);
And I get this output from Unix:
not an error
nbyte!8=2
nbyte8=22
near "C": syntax error
And this from Windows:
not an error
nbyte!8=202
nbyte8=4
nbyte8=8
nbyte8=3
nbyte8=4
nbyte8=7
nbyte8=4
not an error
nbyte8=5
nbyte8=4
nbyte8=4
nbyte8=100
nbyte8=4
nbyte8=8
nbyte8=3
nbyte8=4
nbyte8=7
nbyte8=4
nbyte8=4
nbyte8=45
#include <iostream>
#include "sqlite3.h"
int main()
{
sqlite3 *Database;
sqlite3_stmt *pStatement;
sqlite3_open_v2("test.sqlite", &Database, SQLITE_OPEN_READWRITE |
SQLITE_OPEN_CREATE, 0);
sqlite3_exec(Database, "PRAGMA encoding = \"UTF-16\"", 0, 0, 0);
std::cout << sqlite3_errmsg(Database) << std::endl;
sqlite3_prepare16_v2(Database, L"CREATE TABLE user (userID INTEGER NOT NULL PRIM
ARY KEY, lastName VARCHAR(50), firstName VARCHAR(50));", -1,&pStatement, 0);
std::cout << sqlite3_errmsg(Database) << std::endl;
sqlite3_step(pStatement);
sqlite3_close(Database);
return 0;
}
Michael D. Black
Senior Scientist
Northrop Grumman Mission Systems
________________________________
From: [email protected] on behalf of Jay A. Kreibich
Sent: Sat 5/22/2010 9:43 AM
To: General Discussion of SQLite Database
Subject: Re: [sqlite] UTF16 - sqlite3_prepare16_v2
On Sat, May 22, 2010 at 09:23:06AM -0500, Black, Michael (IS) scratched on the
wall:
> I think you're making the mistake of thinking that the entire SQL
> string is UTF-16.
It is. That's the whole point of the "16" interfaces.
> Look at the API for sqlite3_prepare16_v2
> SQLITE_API int sqlite3_prepare16_v2(
> sqlite3 *db, /* Database handle. */
> const void *zSql, /* UTF-8 encoded SQL statement. */
Yes, I know it says that in the source next to the function, but
that's wrong. Following the source confirms that. A set of
copy-paste errors, no doubt. The website (and the prototypes in the
source) are correct:
http://www.sqlite.org/c3ref/prepare.html
int sqlite3_prepare16_v2(
sqlite3 *db, /* Database handle */
const void *zSql, /* SQL statement, UTF-16 encoded */
int nByte, /* Maximum length of zSql in bytes. */
sqlite3_stmt **ppStmt, /* OUT: Statement handle */
const void **pzTail /* OUT: Pointer to unused portion of zSql */
);
> It's your data fields that get encoded.
Not exactly. The database has a single encoding for all text values.
Any text values that are recorded in the database are converted to that
encoding.
Consider bind values. You can specify input values in whatever
encoding you want. SQLite will convert them to whatever the
database encoding is before recording them. It works the same on
output, where you can request a column in whatever encoding you want,
regardless of the database encoding.
sqlite3_open() and sqlite3_open16() are a bit different. In addition
to the filename, using sqlite3_open16() to create a database will set
the global database encoding to UTF-16. But that has a whole different
set of issues, which is why there is no sqlite3_open16_v2().
-j
--
Jay A. Kreibich < J A Y @ K R E I B I.C H >
"Intelligence is like underwear: it is important that you have it,
but showing it to the wrong people has the tendency to make them
feel uncomfortable." -- Angela Johnson
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