Question

我有一个项目，其中我存储了sqlite数据库文件“data.sqlite3” '分组' ＆安培;文件 ' - ' 资源'

以下是我的viewcontroller源代码

//-myviewcontroller.h
#import "sqlite3.h"
#define kFilename @"data.sqlite3"

//myviewcontroller.m

-(NSString *)dataFilePath
{
    NSArray *paths = NSSearchPathForDirectoriesInDomains(
        NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    return [documentsDirectory stringByAppendingPathComponent:kFilename];
}

-(void)f
{
    if (sqlite3_open([[self dataFilePath] UTF8String],&database)!=SQLITE_OK)
    //dataFilePath returns
    ///Users/interdev/Library/Application Support/iPhone Simulator/User/Applications/095C6E05-4EAE-4817-883E-A72E39D439E0/Documents/data.sqlite3 
    {
        sqlite3_close(database);
        NSAssert(0,@"Failed to open database");//no problem
    }    

    NSString *query = @"SELECT * FROM table1 ORDER BY ROW";//table1 is table name
    sqlite3_stmt *statement;
    NSInteger v=sqlite3_prepare_v2( database, [query UTF8String],
                                   -1, &statement, nil);
    NSString *zs= [NSString stringWithFormat:@"%d",v];
    NSLog(@" The buttontitile is %@ ",zs);
    if ( v == SQLITE_OK) { // ...
}

我在日志中检查了v的值，它总是1

#define SQLITE_ERROR        1   /* SQL error or missing database */

我不知道为什么会这样。

Answer 1

看起来您的代码正在您的应用程序的“Documents”文件夹中查找您的数据库。

NSArray *paths = NSSearchPathForDirectoriesInDomains(
    NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];

因此，如果data.sqlite3文件位于Resources文件夹中，则应用程序将不会找到该数据库。最好在应用程序的“Documents”文件夹中创建和存储sqlitedatabase。例如/ Users / interdev / Library / Application Support / iPhone Simulator / User / Applications / 095C6E05-4EAE-4817-883E-A72E39D439E0 / Documents / data.sqlite3

sqlite错误：/ * SQL错误或缺少数据库* /

1 个答案: