在sqlite的同一個數據庫中插入多個表

Question

創建一個Iphone應用程序，我用來在不同的數據庫上執行INSERT QUERY。 但是，當我試圖在同一個數據庫中插入數據時，它會導致斷言失敗。 我正在閱讀兩個不同的XML URL，並試圖創建數據，然後將數據插入表中，因爲它是通過創建數據庫來讀取的。有沒有人知道爲什麼這會顯示我錯誤？ 我有以下的代碼，並使用SQLite在DB插入：

-(void) insertProductTable:(NSMutableArray *)Dict{ 
[Dict retain]; 
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
NSString *documentsDirectory = [paths objectAtIndex:0]; 
NSString *dbPath = [documentsDirectory stringByAppendingPathComponent:@"product.sql"]; 
NSInteger i; 

if (sqlite3_open([dbPath UTF8String], &database) == SQLITE_OK) { 

    const char * insert_product_sql = "INSERT OR REPLACE INTO test(ID,KEY) VALUES (?,?)" ; 
    if(sqlite3_prepare_v2(database, insert_product_sql, -1, &product_statement, nil) != SQLITE_OK){ 
     NSAssert1(0, @"Error: failed to prepare insert_product_sql: '%s'.", sqlite3_errmsg(database)); 
    } 

    for (i = 0; i < [self.array count]; i++) { 
    sqlite3_bind_text(product_statement, 1, [[Dict valueForKey:@"ID"] UTF8String] ,-1, SQLITE_TRANSIENT); 
    sqlite3_bind_text(product_statement, 2, [[Dict valueForKey:@"KEY"] UTF8String] ,-1, SQLITE_TRANSIENT); 
    } 

    if (sqlite3_step(product_statement) != SQLITE_DONE) { 
     NSAssert(0,@"Error updating table"); 
    } 

    [Dict release]; Dict = 0; 
    sqlite3_finalize(product_statement); 
    sqlite3_close(database); 

} 
} 

我有以下的方法，做不同的插入功能，但不同的表，但在這個階段，不列入允許我插入扔我斷言失敗。這兩種方法都由不同的類來調用。

-(void) insertTable:(NSMutableArray *)Dict{ 
[Dict retain]; 
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
NSString *documentsDirectory = [paths objectAtIndex:0]; 
NSString *dbPath = [documentsDirectory stringByAppendingPathComponent:@"product.sql"]; 
NSInteger i; 

if (sqlite3_open([dbPath UTF8String], &database) == SQLITE_OK) { 

    const char * insert_sql = "INSERT OR REPLACE INTO test1(Term,Value) VALUES (?,?)" ; 
    if(sqlite3_prepare_v2(database, insert_sql, -1, &product_statement, nil) != SQLITE_OK){ 
     NSAssert1(0, @"Error: failed to prepare insert_sql: '%s'.", sqlite3_errmsg(database)); 
    } 

    for (i = 0; i < [self.arayList count]; i++) { 
    sqlite3_bind_text(product_statement, 1, [[Dict valueForKey:@"TERM"] UTF8String] ,-1, SQLITE_TRANSIENT); 
    sqlite3_bind_text(product_statement, 2, [[Dict valueForKey:@"VALUE"] UTF8String] ,-1, SQLITE_TRANSIENT); 
    } 

    if (sqlite3_step(product_statement) != SQLITE_DONE) { 
     NSAssert(0,@"Error updating table"); 
    } 

    [Dict release]; Dict = 0; 

    sqlite3_finalize(product_statement); 
    sqlite3_close(database); 

} 
} 

Answer 1

@lifemoveson

我用你的代碼調試和發現功能

​​

返回1次，每次和它在所需位置對應於你丟失的數據庫。

我會建議你是做一個函數，如本

-(void)checkAndCreateDatabase{ 
    databaseName = @"MasterDB.sqlite"; 
    NSArray *documentPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
    NSString *documentsDir = [documentPaths objectAtIndex:0]; 
    databasePath = [documentsDir stringByAppendingPathComponent:databaseName]; 
    NSLog(@"database path %@",databasePath); 
    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]; 
    //[fileManager release]; 

    // Now we can add new table 

    sqlite3 *database; 
    sqlite3_stmt *statement; 
    if(sqlite3_open([databasePath UTF8String], &database) == SQLITE_OK) 
    { 

     NSString *sqlQuery = [NSString stringWithFormat:@"CREATE TABLE IF NOT EXISTS tbl_Login (userId integer PRIMARY KEY,userName text,password text);"] ; 
     const char *create_stmt = [sqlQuery UTF8String]; 
     sqlite3_prepare_v2(database, create_stmt, -1, &statement, NULL); 

     if(sqlite3_step(statement)==SQLITE_DONE) 
     { 
      NSLog(@"Table created");    
     } 
     else 
     { 
      NSLog(@"Table could not be created"); 
     } 
     // Release the compiled statement from memory 
     sqlite3_finalize(statement);  
     sqlite3_close(database); 
    } 
} 

它設置你的類變量databasePath並確保運行的任何數據庫查詢數據庫中的applcation的文檔目錄實際存在之前。當你進行任何數據庫調用使用該

const char *dbpath = [databasePath UTF8String]; 
    if (sqlite3_open(dbpath , &database) == SQLITE_OK) { 
//Code to perform insert operations 
} 

我建議你寫一個單獨的類爲您執行，而是調用所有數據庫操作可以調用應用程序委託

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions{ 
//Other code 
[self checkAndCreateDatabase]; 

} 

此功能類功能來實現所需的功能。這樣可以節省你重寫代碼的工作量。

您可以使用FMDB包裝的這個，你可以找到here

希望這有助於:-)