Question

下面是我使用的代碼：

FMDatabaseQueue *queue = [[DataBaseHelper sharedManager] queue]; 
[queue inDatabase:^(FMDatabase *db) { 

FMResultSet *results = [db executeQuery:@"select * from EVENT where ESTATUS='unread' and HIT_ATTEMPTS < 5 "]; 

if([results next]) 
{ 
    [results close]; 

    @try { 
      BOOL success=FALSE; 
      NSString *query=[NSString stringWithFormat:@"insert into EVENT (EDATA, ESTATUS ,EUSER) values('%@','%@','%@')",@"google.com",@"unread",@"xyz"]; 

      success = [db executeUpdate:query]; 
      NSLog(@"create edata row, %d:%@", [db lastErrorCode], [db lastErrorMessage]); 
     } 

    @catch (NSException *exception) { 
     NSLog(@"Exception"); 
    } 

在上面的代碼 成功= [分貝的executeUpdate：查詢];不管用。我試過放置斷點。這行代碼全部退出。沒有打印日誌。

Answer 1

我不知道爲什麼你使用try和catch，anywayz按照步驟必將工作

創建數據庫

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
NSString *docsPath = [paths objectAtIndex:0]; 
NSString *path = [docsPath stringByAppendingPathComponent:@"database.sqlite"]; 

FMDatabase *database = [FMDatabase databaseWithPath:path]; 

打開數據庫和創建表（可選）

[database open]; 
//optional 
[database executeUpdate:@"create table user(name text primary key, age int)"]; 

Queryin克將數據庫

FMResultSet *results = [database executeQuery:@"select * from user"]; 
while([results next]) { 
    NSString *name = [results stringForColumn:@"name"]; 
    NSInteger age = [results intForColumn:@"age"];   
    NSLog(@"User: %@ - %d",name, age); 
} 
[database close];