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我有一個應用程序，我把用戶的細節保存到SQLite數據庫。此外，我能夠找到細節並顯示結果。找不到更新的行SQLite IOS
-(void) createDB{
NSString *docsDir;
NSArray *dirPaths;
// Get the documents directory
dirPaths = NSSearchPathForDirectoriesInDomains(
NSDocumentDirectory, NSUserDomainMask, YES);
docsDir = dirPaths[0];
// Build the path to the database file
_databasePath = [[NSString alloc]
initWithString: [docsDir stringByAppendingPathComponent:
@"contactUnique6.db"]];
NSFileManager *filemgr = [NSFileManager defaultManager];
if ([filemgr fileExistsAtPath: _databasePath ] == NO)
{
const char *dbpath = [_databasePath UTF8String];
if (sqlite3_open(dbpath, &_contactDB) == SQLITE_OK)
{
char *errMsg;
const char *sql_stmt =
"CREATE TABLE IF NOT EXISTS CONTACTS (ID INTEGER PRIMARY KEY AUTOINCREMENT , NAME TEXT , ADDRESS TEXT, PHONE TEXT)";
if (sqlite3_exec(_contactDB, sql_stmt, NULL, NULL, &errMsg) != SQLITE_OK)
{
_status.text = @"Failed to create table";
}
sqlite3_close(_contactDB);
} else {
_status.text = @"Failed to open/create database";
}
}
- (IBAction)saveData:(id)sender {
sqlite3_stmt *statement;
const char *dbpath = [_databasePath UTF8String];
if (sqlite3_open(dbpath, &_contactDB) == SQLITE_OK)
{
NSString *insertSQL = [NSString stringWithFormat:
@"INSERT OR IGNORE INTO CONTACTS (name, address, phone) VALUES (\"%@\", \"%@\", \"%@\")",
_name.text, _address.text, _phone.text];
const char *insert_stmt = [insertSQL UTF8String];
sqlite3_prepare_v2(_contactDB, insert_stmt,
-1, &statement, NULL);
if (sqlite3_step(statement) == SQLITE_DONE)
{
_status.text = @"Contact added";
_name.text = @"";
_address.text = @"";
_phone.text = @"";
} else {
_status.text = @"Failed to add contact";
}
sqlite3_finalize(statement);
sqlite3_close(_contactDB);
}
}
- (IBAction)findContact:(id)sender {
const char *dbpath = [_databasePath UTF8String];
sqlite3_stmt *statement;
if (sqlite3_open(dbpath, &_contactDB) == SQLITE_OK)
{
NSString *querySQL = [NSString stringWithFormat:
@"SELECT address, phone FROM contacts WHERE name=\"%@\"",
_name.text];
const char *query_stmt = [querySQL UTF8String];
if (sqlite3_prepare_v2(_contactDB,
query_stmt, -1, &statement, NULL) == SQLITE_OK)
{
if (sqlite3_step(statement) == SQLITE_ROW)
{
NSString *addressField = [[NSString alloc]
initWithUTF8String:
(const char *) sqlite3_column_text(
statement, 0)];
_address.text = addressField;
NSString *phoneField = [[NSString alloc]
initWithUTF8String:(const char *)
sqlite3_column_text(statement, 1)];
_phone.text = phoneField;
_status.text = @"Match found";
} else {
_status.text = @"Match not found";
_address.text = @"";
_phone.text = @"";
}
sqlite3_finalize(statement);
}
sqlite3_close(_contactDB);
}
}
上面的代碼是工作良好。但是，當我嘗試使用更新時，當我嘗試查找它時不顯示。即使聯繫人被保存，它也沒有找到匹配。
這是由我試圖更新代碼：
- (IBAction)saveData:(id)sender {
sqlite3_stmt *statement;
const char *dbpath = [_databasePath UTF8String];
if (sqlite3_open(dbpath, &_contactDB) == SQLITE_OK)
{
NSString *insertSQL = [NSString stringWithFormat:
@"INSERT OR IGNORE INTO CONTACTS (name, address, phone) VALUES (\"%@\", \"%@\", \"%@\")",
_name.text, _address.text, _phone.text];
insertSQL = [NSString stringWithFormat:
@"UPDATE CONTACTS SET name=\"%@\", address=\"%@\", phone=\"%@\"",
_name.text, _address.text, _phone.text];
const char *insert_stmt = [insertSQL UTF8String];
sqlite3_prepare_v2(_contactDB, insert_stmt,
-1, &statement, NULL);
if (sqlite3_step(statement) == SQLITE_DONE)
{
_status.text = @"Contact added";
_name.text = @"";
_address.text = @"";
_phone.text = @"";
} else {
_status.text = @"Failed to add contact";
}
sqlite3_finalize(statement);
sqlite3_close(_contactDB);
}
}
基本上我的目標是能夠保存更新找到的。 （不失上更新的主鍵，因爲我有FK關係）
編輯 這是我創造分貝方法 - （無效）{CREATEDB NSString的 * DOCSDIR; NSArray * dirPaths;
// Get the documents directory
dirPaths = NSSearchPathForDirectoriesInDomains(
NSDocumentDirectory, NSUserDomainMask, YES);
docsDir = dirPaths[0];
// Build the path to the database file
_databasePath = [[NSString alloc]
initWithString: [docsDir stringByAppendingPathComponent:
@"contactUnique6.db"]];
NSFileManager *filemgr = [NSFileManager defaultManager];
if ([filemgr fileExistsAtPath: _databasePath ] == NO)
{
const char *dbpath = [_databasePath UTF8String];
if (sqlite3_open(dbpath, &_contactDB) == SQLITE_OK)
{
char *errMsg;
const char *sql_stmt =
"CREATE TABLE IF NOT EXISTS CONTACTS (ID INTEGER PRIMARY KEY AUTOINCREMENT , NAME TEXT , ADDRESS TEXT, PHONE TEXT)";
if (sqlite3_exec(_contactDB, sql_stmt, NULL, NULL, &errMsg) != SQLITE_OK)
{
_status.text = @"Failed to create table";
}
sqlite3_close(_contactDB);
} else {
_status.text = @"Failed to open/create database";
}
}