Question

我正在尝试学习php而我无法从我的数据库中读取任何数据！我知道与服务器的连接是实时的和工作的，但这条线似乎给了我一些问题。

$result = $conn->query($sql);

$sql = "SELECT firstName, middleName, lastName FROM Base"; 我不确定问题是什么，但任何提示或答案都表示赞赏。

<!DOCTYPE html>
<html>
<head>
</head>
<body>
<h1>My first PHP page</h1>
<?php
// connect to database
$user_name = "superUser";
$password = "";
$database = "Base"$server = "127.0.0.5";
// open connection to the server
$conn = new mysqli($server, $user_name, $password);
// echo "Connection to the server is open";
// check connetion
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}
else {
    print "Connection to the server is open";
}
// load the data from the table
$sql = "SELECT firstName, middleName, lastName FROM Base";
// echo $conn->server_info;
$result = $conn->query($sql);
if ($result) {
    echo "Table was found";
}
else echo "no";
/*while($row = $result->fetch_assoc()) {
echo "id: " . $row["id"]. " - Name: " . $row["firstname"]. " " . $row["lastname"]. "<br />";
}
print $result["firstName"];// ": Number of Rows!" ;*/
// if ($result->num_rows > 0) {
// output data of each row
// close server connection
$conn->close();
?>
</body>
</html>

Answer 1

以下是mysqli连接示例。

@interface LBSelectUniversityView()<UISearchResultsUpdating, UISearchBarDelegate>
@property (strong, nonatomic) UISearchController *searchController;
@end

@implementation LBSelectUniversityView {
    NSArray *schoolNames;
    NSArray *searchResults;
}


- (void)viewDidLoad {
    [super viewDidLoad];
    schoolNames = [[LBUtilities sharedInstance] schoolNames];
    searchResults = schoolNames;
    self.searchController = [[UISearchController alloc] initWithSearchResultsController:nil];
    self.searchController.searchResultsUpdater = self;
    self.searchController.dimsBackgroundDuringPresentation = NO;
    self.searchController.searchBar.delegate = self;
    self.tableView.tableHeaderView = self.searchController.searchBar;
    self.definesPresentationContext = YES;
    [self.searchController.searchBar sizeToFit];
}

#pragma mark - Table view data source
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
    return 1;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    return searchResults.count;
}

- (UITableViewCell *)tableView:(UITableView *)tableView
         cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    static NSString *CellIdentifier = @"Cell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault
                                      reuseIdentifier:CellIdentifier];
    }
    ...
    return cell;
}

- (void)filterContentForSearchText:(NSString*)searchText{
    if ([searchText isEqualToString:@""]) return;

    NSPredicate *resultPredicate = [NSPredicate
                                    predicateWithFormat:@"SELF contains[cd] %@",
                                    searchText];
    searchResults = [schoolNames filteredArrayUsingPredicate:resultPredicate];
}

- (void)updateSearchResultsForSearchController:(UISearchController *)searchController{
    NSString *searchString = searchController.searchBar.text;
    [self filterContentForSearchText:searchString];
    [self.tableView reloadData];
}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    ...
    [self.navigationController popViewControllerAnimated:YES];
}

@end

您忘记添加数据库名称。改变这个，

<?php
$con = mysqli_connect("localhost","my_user","my_password","my_db");

// Check connection
if (mysqli_connect_errno())
  {
  echo "Failed to connect to MySQL: " . mysqli_connect_error();
  }
?>

到这个

$conn = new mysqli($server, $user_name, $password);

php从sql数据库中读取数据

1 个答案: