Question

我差不多完成了这个项目。我使用SQLite创建了一个小型电话簿应用程序。成功构建后我遇到线程错误。在gist中，我会告诉你我在这个项目中的意义。我创建了一个简单的电话簿，您可以在其中添加此人的姓名，号码和地址。有两个按钮可以保存和查找联系人。所有状态均以标签打印。我已将libsqlite3.dylib包含并导入到项目中。一旦构建完成。我在主类中遇到一个线程错误，说明了libc ++ abi.dylib：terminate被称为抛出异常。

有任何帮助吗？我差不多完成了这个项目。

我的viewcontroller.h看起来像这样：

#import <UIKit/UIKit.h>
#import <sqlite3.h>

@interface ViewController : UIViewController
@property (strong, nonatomic) IBOutlet UITextField *name;
@property (strong, nonatomic) IBOutlet UITextField *address;
@property (strong, nonatomic) IBOutlet UITextField *phone;
@property (strong, nonatomic) IBOutlet UILabel *status;
- (IBAction)saveData:(id)sender;
- (IBAction)findContact:(id)sender;
@property (strong, nonatomic) NSString *databasePath;
@property (nonatomic) sqlite3 *contactDB;
@end

我的viewcontroller.m看起来像这样：

#import "ViewController.h"
@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    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:
                                  @"contacts.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";
        }
    }
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (IBAction)saveData:(id)sender
{
    sqlite3_stmt    *statement;
    const char *dbpath = [_databasePath UTF8String];

    if (sqlite3_open(dbpath, &_contactDB) == SQLITE_OK)
    {

        NSString *insertSQL = [NSString stringWithFormat:
                           @"INSERT INTO CONTACTS (name, address, phone) VALUES (\"%@\", \"%@\", \"%@\")",
                           self.name.text, self.address.text, self.phone.text];

        const char *insert_stmt = [insertSQL UTF8String];
        sqlite3_prepare_v2(_contactDB, insert_stmt,
                       -1, &statement, NULL);
        if (sqlite3_step(statement) == SQLITE_DONE)
        {
            self.status.text = @"Contact added";
            self.name.text = @"";
            self.address.text = @"";
            self.phone.text = @"";
        }

        else

        {
            self.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);
    }
}
@end

Answer 1

在“.h”文件的import语句中，改为：

#import "/usr/include/sqlite3.h"

您必须指定sqlite3头文件的完整路径。

使用sqlite的电话簿iOS应用程序

1 个答案: