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我是iPhone開發新手。我正在製作一個應用程序，使用sqlite3的數據庫。我用sqlite3管理器3.9.5創建我的表，並在appdelegete.m文件和數據庫副本中成功寫入代碼複製數據庫。如何在數據庫中插入數據並從數據庫中獲取數據
我在數據庫中插入數據，使用主鍵成功插入，但是當我從數據庫訪問數據時，它發送null，如果我打開我的數據庫並打開我的表格，它們不會顯示我在表格中輸入的數據。這裏是我的代碼插入數據並從數據庫中獲取數據。
- (IBAction)addrecord:(id)sender {
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *path = [documentsDirectory stringByAppendingPathComponent:@"ebirthdaydatabase.sqlite"];
if (sqlite3_open([path UTF8String], &database) == SQLITE_OK) {
const char *sqlStatement = "insert into Name(name) VALUES(?)";
sqlite3_stmt *compiledStatement;
if (sqlite3_prepare_v2(database, sqlStatement, -1, &compiledStatement, NULL) == SQLITE_OK){
NSLog(@"name.text :%@",name.text);
sqlite3_bind_text(compiledStatement, 1, [name.text UTF8String], -1, SQLITE_TRANSIENT);
// ShowContactsViewController *contact = [[ShowContactsViewController alloc]init];
// contact.username = name.text;
// [contact addarray:contact];
}
if(sqlite3_step(compiledStatement) != SQLITE_DONE) {
NSLog(@"Error: %s", sqlite3_errmsg(database));
} else {
NSLog(@"Insert into row id = %lld", sqlite3_last_insert_rowid(database));
}
sqlite3_finalize(compiledStatement);
sqlite3_close(database);
}
sqlite3 *database;
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *path = [documentsDirectory stringByAppendingPathComponent:@"ebirthdaydatabase.sqlite"];
NSLog(@"%@",path);
if (sqlite3_open([path UTF8String], &database) == SQLITE_OK) {
const char *sql = "select name from Name";
sqlite3_stmt *selectstmt;
if(sqlite3_prepare_v2(database, sql, -1, &selectstmt, NULL) == SQLITE_OK) {
while(sqlite3_step(selectstmt) == SQLITE_ROW) {
// NSInteger primaryKey = sqlite3_column_int(selectstmt, 0);
// Coffee *coffeeObj = [[Coffee alloc] initWithPrimaryKey:primaryKey];
ShowContactsViewController *contact=[[ShowContactsViewController alloc]init];
char *localityChars =(char *)sqlite3_column_name(selectstmt, 0);
if (localityChars ==NULL)
contact.username = nil;
else
contact.username = [NSString stringWithUTF8String: localityChars];
//contact.username = [NSString stringWithUTF8String:(char *)sqlite3_column_text(selectstmt, 1)];
NSLog(@"%@",username);
[showcontact addObject:contact];
}
}
}