我打开数据库,但是当我检查语句是否正常时,出现以下错误。sqlite3_prepare_v2() - 没有这样的表
Error no such table: Event
下面是部分代码:
if (sqlite3_open(dbpath, &database) == SQLITE_OK)
{
NSString *querySQL = @"SELECT nic,subject,location,participants,startDate,endDate FROM Event";
const char *query_stmt = [querySQL UTF8String];
if (sqlite3_prepare_v2(database,query_stmt, -1, &statement, NULL) == SQLITE_OK)
如果我不开我不得到任何错误的数据库,但如果我再次调用该函数,我得到:
library routine called out of sequence
创建数据库的代码:
-(BOOL)createDB
{
// Get the documents directory
NSString *docsDir;
NSArray *dirPaths;
dirPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
docsDir = dirPaths[0];
// Build the path to the database file
databasePath = [[NSString alloc] initWithString:[docsDir stringByAppendingPathComponent: @"reglis.db"]];
BOOL isSuccess = YES;
NSFileManager *filemgr = [NSFileManager defaultManager];
if ([filemgr fileExistsAtPath: databasePath ] == NO)
{
const char *dbpath = [databasePath UTF8String];
if (sqlite3_open(dbpath, &database) == SQLITE_OK)
{
char *errMsg;
const char *sql_stmt ="DROP TABLE IF EXISTS Client;CREATE TABLE Client (nic VARCHAR PRIMARY KEY NOT NULL UNIQUE , name VARCHAR, location VARCHAR, postalCode VARCHAR);DROP TABLE IF EXISTS Meio;CREATE TABLE Meio (id_meio VARCHAR PRIMARY KEY NOT NULL , nic VARCHAR, email VARCHAR, telefone VARCHAR, telemovel VARCHAR, id_tipo_meio VARCHAR);DROP TABLE IF EXISTS Event;CREATE TABLE Event (nic VARCHAR PRIMARY KEY NOT NULL , subject VARCHAR, location VARCHAR, participants VARCHAR, startDate VARCHAR, endDate VARCHAR);";
if (sqlite3_exec(database, sql_stmt, NULL, NULL, &errMsg)
!= SQLITE_OK)
{
isSuccess = NO;
NSLog(@"Failed to create tables");
}
sqlite3_close(database);
return isSuccess;
}
else {
isSuccess = NO;
NSLog(@"Failed to open/create database");
}
}
return isSuccess;
}
dbpath是什么,真的有一个现有的数据库?注意'sqlite3_open()'创建一个新的数据库,如果它不存在的话。 – laalto
是的,如果我评论如果打开数据库,我可以运行一次查询 – bruno
让我们[在聊天中继续讨论](http://chat.stackoverflow.com/rooms/47432/discussion-between-rob -and-bruno) – Rob