简短的回答是，您只需实例化您的数组，遍历 SQLite 结果，将对象添加到您的数组中。
长答案：
我同意 trojanfoe 的观点，即您不应该为表的四列维护单独的数组。您应该有一个单独的类，例如Contact，它包含所有四个列值，然后构建一个数组。因此，该类可能如下所示：
@interface Contact : NSObject
@property (nonatomic) long long contactId;
@property (nonatomic, copy) NSString *name;
@property (nonatomic, copy) NSString *email;
@property (nonatomic, copy) NSString *mobile;
@end
@implementation Contact
// nothing required here
@end
你说你正在使用 SQLite。我建议您考虑使用FMDB。这是一个围绕SQLite C 语言 API的精简包装器，极大地简化了您与 SQLite 数据库的交互。我下面的示例将使用这个 FMDB 库。
因此，正如“简短答案”中所建议的，您只需遍历 SQL 结果，将项目添加到数组中：
FMDatabase *database = [FMDatabase databaseWithPath:path];
BOOL success = [database open];
NSAssert(success, @"database open failed");
FMResultSet *rs = [database executeQuery:@"select id, name, email, mobile from test"];
NSAssert(rs, @"select failed: %@", [database lastErrorMessage]);
NSMutableArray *contacts = [NSMutableArray array];
while ([rs next])
{
Contact *contact = [[Contact alloc] init];
contact.contactId = [rs longLongIntForColumn:@"id"];
id name = rs[@"name"];
if (name != [NSNull null]) // if the column can be NULL, you might want to check for that condition
contact.name = name;
id email = rs[@"email"];
if (email != [NSNull null])
contact.email = email;
id mobile = rs[@"mobile"];
if (mobile != [NSNull null])
contact.mobile = mobile;
[contacts addObject:contact];
}
[rs close];
现在，您可以像这样访问该contacts数组中的信息：
Contact *contact = contacts[2];
NSString *email = contact.email;
第一行检索对第三个联系人的引用。下一行检索该联系人的电子邮件地址。希望这能说明这个想法。
显然，如果您决定使用 SQLite C 语言接口（例如，调用sqlite3_open、sqlite3_prepare_v2等），您可以，但它需要更多的工作（尤其是当您开始使用 SQL 语句的参数时）。我强烈推荐使用 FMDB。
同样，如果您想为表格的四列设置单独的数组，您可以这样做，但是使用像上述Contact类这样的类要优雅得多，并且会产生更多逻辑代码。
您需要先执行 fetch 请求，如下所示：
NSManagedObjectContext *moc = [self managedObjectContext];
NSEntityDescription *entityDescription = [NSEntityDescription
entityForName:yourTable inManagedObjectContext:moc];
NSFetchRequest *request = [[NSFetchRequest alloc] init];
[request setEntity:entityDescription];
NSError *error = nil;
NSArray *array = [moc executeFetchRequest:request error:&error];
然后，您需要执行以下操作：
NSArray *names = [array valueForKeyPath:@"@unionOfObjects.Name"];
有很多事情要做：
现在要在 database.h 中编写代码：
@interface 数据库：NSObject {
NSString *databaseName; NSString *databasePath; } @property(nonatomic,retain)NSString *databaseName; @property(nonatomic,retain)NSString *databasePath; -(void)startDB; -(void)checkAndCreateDatabase;
现在.m：
@implementation database : NSObject
@synthesize databasePath, databaseName;
-(void)startDB {
// Setup some globals
databaseName = @"yourdb.sqlite";
// Get the path to the documents directory and append the databaseName
NSArray *documentPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDir = [documentPaths objectAtIndex:0];
databasePath = [documentsDir stringByAppendingPathComponent:databaseName];
// Execute the "checkAndCreateDatabase" function
[self checkAndCreateDatabase];
}
-(void)checkAndCreateDatabase{
// Check if the SQL database has already been saved to the users phone, if not then copy it over
BOOL success;
// Create a FileManager object, we will use this to check the status
// of the database and to copy it over if required
NSFileManager *fileManager = [NSFileManager defaultManager];
// Check if the database has already been created in the users filesystem
success = [fileManager fileExistsAtPath:databasePath];
// If the database already exists then return without doing anything
if(success) return;
// If not then proceed to copy the database from the application to the users filesystem
// Get the path to the database in the application package
NSString *databasePathFromApp = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:databaseName];
// Copy the database from the package to the users filesystem
[fileManager copyItemAtPath:databasePathFromApp toPath:databasePath error:nil];
}
用表的特定列填充数组：
在 ViewController.m 中导入 database.h 并编写以下代码：
-(void)viewWillAppear:(BOOL)animated {
[self queryNomi];
}
-(void)queryNomi {
[arrayName removeAllObjects];
[arrayEmail removeAllObjects];
database *dbDelegate = [[database alloc]init];
[dbDelegate startDB];
sqlite3 *database;
NSString *queryName = [NSString stringWithFormat:@"SELECT Name FROM nameTable"];
NSString *queryEmail = [NSString stringWithFormat:@"SELECT Email FROM nameTable"];
if(sqlite3_open([dbDelegate.databasePath UTF8String], &database) == SQLITE_OK) {
sqlite3_stmt *compiledStatement1;
sqlite3_stmt *compiledStatement2;
if(sqlite3_prepare_v2(database, [queryName UTF8String], -1, &compiledStatement1, NULL) == SQLITE_OK) {
while(sqlite3_step(compiledStatement1) == SQLITE_ROW) {
[arrayName addObject:[NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement1, 0)]];
}
}
if(sqlite3_prepare_v2(database, [queryEmail UTF8String], -1, &compiledStatement2, NULL) == SQLITE_OK) {
while(sqlite3_step(compiledStatement2) == SQLITE_ROW) {
[arrayEmail addObject:[NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement2, 0)]];
}
}
sqlite3_finalize(compiledStatement1);
sqlite3_finalize(compiledStatement2);
sqlite3_close(database);
}
// [self.tableView reloadData];
}
我似乎都写了..让我知道！