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編輯：已解決！回答下面的第一個代碼框SQLite表不存在
當我嘗試連接一個sqlite數據庫（與表TblTest）。在我的應用程序調試模式，錯誤的是：
*在斷言失敗 - [QueryClass getTestData：]， *終止應用程序由於未捕獲的異常「NSInternalInconsistencyException」，理由是：「廣東話建立SQL讀取項目[沒有這樣的表格：TblTest]'
在發佈模式（模擬器）中，它不會給出錯誤，但它不會讀取數據庫。 代碼的行爲就像它可以連接到數據庫，但不能讀取TblTest？
我已經重置了模擬器並使用了clean和build。
很抱歉的長碼：
@implementation QueryClass
@synthesize databaseName;
@synthesize databaseLite;
-(id)initWithDatabase:(NSString *)databaseNameP{
if(self = [super init]){
[self createEditableCopyOfDatabaseIfNeeded];
self.databaseName = databaseNameP;
self.databaseLite = [self getNewDBConnection];
}
return self;
}
- (void)createEditableCopyOfDatabaseIfNeeded {
NSLog(@"Creating editable copy of database");
// First, test for existence.
BOOL success;
NSFileManager *fileManager = [NSFileManager defaultManager];
NSError *error;
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *writableDBPath = [documentsDirectory stringByAppendingPathComponent:self.databaseName];
success = [fileManager fileExistsAtPath:writableDBPath];
if (success) return;
// The writable database does not exist, so copy the default to the appropriate location.
NSString *defaultDBPath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:self.databaseName];
success = [fileManager copyItemAtPath:defaultDBPath toPath:writableDBPath error:&error];
if (!success) {
NSAssert1(0, @"Failed to create writable database file with message ‘%@’.", [error localizedDescription]);
}
}
- (sqlite3 *) getNewDBConnection{
sqlite3 *newDBconnection;
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *path = [documentsDirectory stringByAppendingPathComponent:self.databaseName];
// Open the database. The database was prepared outside the application.
if (sqlite3_open([path UTF8String], &newDBconnection) == SQLITE_OK) {
NSLog(@"Database Successfully Opened ");
} else {
NSLog(@"Error in opening database ");
}
return newDBconnection;
}
-(NSMutableArray *)getTestData:(NSInteger) testId{
(NSMutableArray *testArray = [[NSMutableArray alloc]init];
int ret;
sqlite3_stmt *selStmt = nil;
const char *sql = "SELECT testId, name, FROM TblTest WHERE testId = ?";
if (!selStmt)
{ // build update statement
if (sqlite3_prepare_v2(self.databaseLite, sql, -1, &selStmt, NULL)!=SQLITE_OK)
{
selStmt = nil;
}
}
sqlite3_bind_int(selStmt, 1, testId);
if(!selStmt){
NSAssert1(0, @"Cant build SQL to read item [%s]", sqlite3_errmsg(self.databaseLite));
}
while ((ret=sqlite3_step(selStmt))==SQLITE_ROW)
{ // get the fields from the record set and assign to item
Test *test = [[Test alloc]init];
NSNumber *testId = [NSNumber numberWithInt: (int) sqlite3_column_int(selStmt, 0)];
NSString *name = [NSString stringWithUTF8String:(char *) sqlite3_column_text(selStmt, 1)];
test.testId =testId;
test.name =name;
[testArray addObject:pill];
[test release];
}
sqlite3_reset(selStmt);
return [testArray autorelease];
}
//in my function i do:
qc = [[QueryClass alloc]initWithDatabase:@"databaseLite.sql"];
[qc getTestData:0];
我使用this教程改寫了我的代碼，它就像一個魅力。 :)
感謝
-(id)initWithDatabase:(NSString *)databaseNameP{
if(self = [super init]){
[self createEditableCopyOfDatabaseIfNeeded];
[self initializeDatabase];
}
return self;
}
// Creates a writable copy of the bundled default database in the application Documents directory.
- (void)createEditableCopyOfDatabaseIfNeeded {
// First, test for existence.
BOOL success;
NSFileManager *fileManager = [NSFileManager defaultManager];
NSError *error;
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *writableDBPath = [documentsDirectory stringByAppendingPathComponent:@"databaseLite4.sqlite"];
success = [fileManager fileExistsAtPath:writableDBPath];
if (success) return;
// The writable database does not exist, so copy the default to the appropriate location.
NSString *defaultDBPath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"databaseLite4.sqlite"];
success = [fileManager copyItemAtPath:defaultDBPath toPath:writableDBPath error:&error];
if (!success) {
NSAssert1(0, @"Failed to create writable database file with message '%@'.", [error localizedDescription]);
}
}
// Open the database connection and retrieve minimal information for all objects.
- (void)initializeDatabase {
// The database is stored in the application bundle.
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
self.path = [documentsDirectory stringByAppendingPathComponent:@"databaseLite4.sqlite"];
}
「沒有這樣的表：TBLTEST」意味着表不存在於數據庫中。要麼你有一箇舊的數據庫，你需要先刪除應用程序，或者你拼錯了表名，或者你從來沒有創建過這樣的表。你有沒有檢查拼寫，也許它是tblTest或什麼？ – vakio 2011-05-10 13:23:57