Dear Jonathan,
I tried to use "unix-dotfile" according to your comment.
I am successful for testing sqlite.
I attached my testing code.
Thank you very much.
Best Regards,
JunBeom
-----Original Message-----
From: Jonathan Brandmeyer <[email protected]>
Sent: Saturday, March 30, 2019 3:50 AM
To: JunBeom Kim <[email protected]>
Cc: [email protected]
Subject: Re: Sqlite building failure using rtems-source-builder
On Fri, Mar 29, 2019 at 12:57 AM JunBeom Kim <[email protected]> wrote:
> Because there is file locking problem due to fcntl(F_SETLK) unsupported
> feature, DB file access is error.
SQLite3 ships with a set of VFS methods that avoid file locking entirely, named
"unix-none". There are several methods available to pick this style of
locking. Since my application is being tested on both a general-purpose POSIX
OS as well as RTEMS, I change the VFS type in my RTEMS startup code using
sqlite3_vfs_find() and sqlite3_vfs_register(). There is also a "unix-dotfile"
method available, and we may switch over to that for better error-handling
paths.
In the case of the "unix-none" locking mode, you must maintain the invariant
that there is exactly one database connection per database file in the entire
application. That seems OK to me, so we set the
-DSQLITE_DEFAULT_LOCKING_MODE=1 (EXCLUSIVE) to help enforce it in the testing
environment.
>
> After I modify this, there is not problem using simple sqlite example
> code(attached: main.c).
> But, there is side-effect(for example: memory leaking issue by locking patch
> code) in my customer side using RTEMS.
Regarding your memory leak, don't forget to sqlite3_close() the database. This
must be done even if sqlite3_open() fails.
HTH,
--
Jonathan Brandmeyer
#include <stdlib.h>
#include <stdbool.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <fcntl.h>
#include <bsp.h>
#include <sqlite3.h>
static int callback(void *NotUsed, int argc, char **argv, char **azColName) {
int i;
for(i = 0; i<argc; i++) {
printf("%s = %s\n", azColName[i], argv[i] ? argv[i] : "NULL");
}
printf("\n");
return 0;
}
sqlite3 *db;
int rc;
void create_table(void)
{
char *zErrMsg = 0;
char *sql;
/* Change VFS for unix dotflie */
rc = sqlite3_vfs_register(sqlite3_vfs_find("unix-dotfile"), 1);
if (rc) {
printf("sqlite3_vfs_register: fail=%d\n", rc);
}
/* Open database */
rc = sqlite3_open("/mnt/ramdisk/test.db", &db);
if( rc ) {
printf("Can't open database: %s\n", sqlite3_errmsg(db));
return 0;
} else {
printf("Opened database successfully\n");
}
/* Create SQL statement */
sql = "CREATE TABLE COMPANY(" \
"ID INT PRIMARY KEY NOT NULL," \
"NAME TEXT NOT NULL," \
"AGE INT NOT NULL," \
"ADDRESS CHAR(50)," \
"SALARY REAL );";
/* Execute SQL statement */
rc = sqlite3_exec(db, sql, callback, 0, &zErrMsg);
if( rc != SQLITE_OK ){
printf("SQL error: %s\n", zErrMsg);
sqlite3_free(zErrMsg);
} else {
printf("Table created successfully\n");
}
}
void insert_table(void)
{
char *zErrMsg = 0;
char *sql;
/* Create SQL statement */
sql = "INSERT INTO COMPANY (ID,NAME,AGE,ADDRESS,SALARY) " \
"VALUES (1, 'Paul', 32, 'California', 20000.00 ); " \
"INSERT INTO COMPANY (ID,NAME,AGE,ADDRESS,SALARY) " \
"VALUES (2, 'Allen', 25, 'Texas', 15000.00 ); " \
"INSERT INTO COMPANY (ID,NAME,AGE,ADDRESS,SALARY)" \
"VALUES (3, 'Teddy', 23, 'Norway', 20000.00 );" \
"INSERT INTO COMPANY (ID,NAME,AGE,ADDRESS,SALARY)" \
"VALUES (4, 'Mark', 25, 'Rich-Mond ', 65000.00 );";
/* Execute SQL statement */
rc = sqlite3_exec(db, sql, callback, 0, &zErrMsg);
if( rc != SQLITE_OK ){
printf("SQL error: %s\n", zErrMsg);
sqlite3_free(zErrMsg);
} else {
printf("Records created successfully\n");
}
}
int main(int argc, char *argv[])
{
create_table();
insert_table();
while (1)
{
usleep(1000000);
}
return 0;
}
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