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我是iPhone开发新手。我正在制作一个应用程序，使用sqlite3的数据库。我用sqlite3管理器3.9.5创建我的表，并在appdelegete.m文件和数据库副本中成功写入代码复制数据库。如何在数据库中插入数据并从数据库中获取数据
我在数据库中插入数据，使用主键成功插入，但是当我从数据库访问数据时，它发送null，如果我打开我的数据库并打开我的表格，它们不会显示我在表格中输入的数据。这里是我的代码插入数据并从数据库中获取数据。
- (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];
}
}
}