以編程方式在iphone sdk中創建sqlite數據庫

Question

hai我試圖在運行時以編程方式創建sqlite數據庫。任何人都可以說如何在iphone sdk中創建它。

Answer 1

只要調用sqlite3_open函數，它將在路徑上沒有數據庫的情況下創建數據庫。

// generate databasePath programmatically 
if(sqlite3_open([databasePath UTF8String], &database) == SQLITE_OK) 
{ 

// your code here 
} 

後，如果您需要在此

Answer 2

-(void)viewDidLoad 
{ 
    [super viewDidLoad]; 
    NSString *docsDir; 
    NSArray *dirPaths; 
    // Get the documents directory 
    dirPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 

    docsDir = [dirPaths objectAtIndex:0]; 

    // Build the path to the database file 
    databasePath = [[NSString alloc] initWithString: [docsDir stringByAppendingPathComponent: @"contacts.sqlite"]]; 
    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) 
      { 
       NSLog(@"if"); 

      } 

      sqlite3_close(contactDB); 

     } else 
     { 
      NSLog(@"else"); 

     } 
    } 
    [filemgr release]; 

} 

-(IBAction)table 
{ 
    NSString *docsDir; 
    NSArray *dirPaths; 

    // Get the documents directory 
    dirPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 

    docsDir = [dirPaths objectAtIndex:0]; 

    // Build the path to the database file 
    databasePath = [[NSString alloc] initWithString: [docsDir stringByAppendingPathComponent: @"contacts.sqlite"]]; 

    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 LIST (ID INTEGER PRIMARY KEY AUTOINCREMENT, NAME TEXT, ADDRESS TEXT, PHONE TEXT)"; 

      if (sqlite3_exec(contactDB, sql_stmt, NULL, NULL, &errMsg) != SQLITE_OK) 
      { 

        NSLog(@"tables failed"); 
       // status.text = @"Failed to create table"; 
      } 

      sqlite3_close(contactDB); 

     } 
     else 
     { 

      NSLog(@"tables failed"); 
      //status.text = @"Failed to open/create database"; 

     } 
    } 

    [filemgr release]; 
} 

Answer 3

進口在.m文件＃進口sqlite3.h更多的代碼示例，並在烏拉圭回合項目中添加框架libsqlite3.0.dylib

評論首先創建NSObject類並將其命名爲Database。 在.H類

@interface database : NSObject 

    { 
    NSString *databasePath; 
NSString *databaseName; 
sqlite3 *myDatabase; 
NSArray *documentPaths; 
NSString *documentsDir; 

} 

// ---初始方法-------

-(void)createDatabaseIfNeeded; 

// --------------- --path find method --------------------- //

-(void)pathFind; 

// ------------- ----寫入值---------------------- //

-(void)writeValueInSettings:(NSMutableArray *)arrayvalue; 

// -------------------從設定表獲取值------------ //

-(NSMutableArray *)fetchValue; 

// -------------------更新值--------------------- //

-(void)updateSetting:(NSArray *)arr; 

.M類寫

-(id)init 
    { 
if((self=[super init])) 
{ 
    [self createDatabaseIfNeeded]; 
} 
return self;  
    } 

//-----------create database if needed method--------------// 
-(void)createDatabaseIfNeeded 
    { 
[self pathFind]; 

BOOL success; 
NSFileManager *filemgr = [NSFileManager defaultManager]; 
success=[filemgr fileExistsAtPath:databasePath]; 

if (success)return; 

NSLog(@"not success"); 

//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 
[filemgr copyItemAtPath:databasePathFromApp toPath:databasePath error:nil]; 


    } 

// ----------------路徑找到----------------- //

-(void)pathFind 
    { 
databaseName = @"accDataBase.DB"; 
// Get the path to the documents directory and append the databaseName 
documentPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
documentsDir = [documentPaths objectAtIndex:0]; 
databasePath = [documentsDir stringByAppendingPathComponent:databaseName]; 
    } 

// ------------------寫入設定值---------------- //

-(void)writeValueInSettings:(NSMutableArray *)arrayvalue 
    { 
    NSLog(@"%@",arrayvalue); 

    if(sqlite3_open([databasePath UTF8String],&myDatabase)==SQLITE_OK) 

    { 
    database *objectDatabase=[[database alloc]init]; 

    NSString *stringvalue2=[objectDatabase countValue]; 
    [objectDatabase release]; 
    int intvalue1=[stringvalue2 intValue]; 

    intvalue1=intvalue1+1; 
    NSLog(@"opened"); 
    NSString *sql1; 

    sql1=[[NSString alloc] initWithFormat:@"insert into setting values('%i','%i','%i','%@','%i','%i','%@','%i','%i','%i','%i','%i','%i','%@');",intvalue1, 
      [[arrayvalue objectAtIndex:0] intValue],[[arrayvalue objectAtIndex:1] intValue],[arrayvalue objectAtIndex:2],[[arrayvalue objectAtIndex:3] intValue],[[arrayvalue objectAtIndex:4]intValue ],[arrayvalue objectAtIndex:5],[[arrayvalue objectAtIndex:6]intValue],[[arrayvalue objectAtIndex:7]intValue ],[[arrayvalue objectAtIndex:8] intValue],[[arrayvalue objectAtIndex:9] intValue],[[arrayvalue objectAtIndex:10]intValue ],[[arrayvalue objectAtIndex:11]intValue],[arrayvalue objectAtIndex:12]]; 
    char *err1; 
    if (sqlite3_exec(myDatabase,[sql1 UTF8String],NULL,NULL,&err1)==SQLITE_OK) 
    { 
     NSLog(@"value inserted:"); 
    } 
    [sql1 release]; 
    sqlite3_close(myDatabase); 
} 

} // ------------獲取所有值------------- //

-(NSMutableArray *)fetchValue 
    { 
NSMutableArray *list=nil; 

    list=[[[NSMutableArray alloc]init] autorelease]; 

if(sqlite3_open([databasePath UTF8String],&myDatabase)==SQLITE_OK) 
{ 

    NSString *sql=[NSString stringWithFormat: @"select * from setting where primaryKey=1"]; 
      sqlite3_stmt *statement; 

    if(sqlite3_prepare_v2(myDatabase, [sql UTF8String], -1,&statement, NULL)==SQLITE_OK) 
    { 
     if(sqlite3_step(statement)==SQLITE_ROW) 
     { 
      for(int i=0;i<=13;i++) 
      { 
       char *pass=(char*)sqlite3_column_text(statement,i); 
       NSString *msg=[[NSString alloc]initWithUTF8String:pass]; 
       [list addObject:msg]; 
       [msg release]; 
      } 

     } 
     sqlite3_finalize(statement); 
    } 
    sqlite3_close(myDatabase); 
    } 

    return list; 

     } 

// ----- -----------更新設置表方法--------------- //

-(void)updateSetting:(NSArray *)arr 
    {  
if(sqlite3_open([databasePath UTF8String],&myDatabase)==SQLITE_OK) 
{ 
    NSLog(@"opened"); 
    sqlite3_stmt *compiledStmt; 

    // NSLog(@"%@",arr); 

    NSString *sqlStmt=[NSString stringWithFormat:@"UPDATE setting SET ragular=%i,cycle=%i, flow='%@', hour=%i,minute=%i,formate='%@' ,tenminute=%i ,thirtyminute=%i,sixtymin=%i, twentymin=%i, fourtyfivemin=%i ,other='%@',formatemessage ='%@' WHERE primaryKey=%i;",[[arr objectAtIndex:0]intValue],[[arr objectAtIndex:1]intValue],[arr objectAtIndex:2],[[arr objectAtIndex:3]intValue],[[arr objectAtIndex:4]intValue],[arr objectAtIndex:5],[[arr objectAtIndex:6]intValue],[[arr objectAtIndex:7]intValue],[[arr objectAtIndex:8]intValue],[[arr objectAtIndex:9]intValue],[[arr objectAtIndex:10]intValue],[arr objectAtIndex:11],[arr objectAtIndex:12],1]; 
// NSLog(@"%@",sqlStmt); 
    if(sqlite3_prepare_v2(myDatabase, [sqlStmt UTF8String],-1,&compiledStmt, NULL)==SQLITE_OK) 
     { 
    NSLog(@"updateding......cycle"); 
     } 
    sqlite3_step(compiledStmt); 
    sqlite3_close(myDatabase); 
} 

    }