如何以编程方式在sqlite数据库中创建表格

我是iphone上的sqlite新手。如何以编程方式在sqlite数据库中创建表格

我想创建一个数据库使用terminal.Now我需要通过我的应用程序中的代码创建一个表。

我的代码是

-(BOOL)createtable:(NSString *)tableName { 
    BOOL ret; 
    int rc; 
    // SQL to create new table 

    NSString *sql_str = [NSString stringWithFormat:@"CREATE TABLE %@ (pk INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL , ItemName VARCHAR(100), Quantity INTEGER DEFAULT 0, Status BOOLEAN,Type VARCHAR(100))", tableName]; 

    const char *sqlStatement = (char *)[sql_str UTF8String]; 
    NSLog(@"query %s",sqlStatement); 

    sqlite3_stmt *stmt; 
    rc = sqlite3_prepare_v2(database, sqlStatement, -1, &stmt, NULL); 

    ret = (rc == SQLITE_OK); 
    if (ret) 
    { // statement built, execute 
     rc = sqlite3_step(stmt); 
     ret = (rc == SQLITE_DONE); 
    } 

    sqlite3_finalize(stmt); // free statement 
    NSLog(@"creating table"); 
    return ret; 
}

但不创建的表，我检查了Mozilla源码管理器数据库。

任何人都可以帮助我。

谢谢你提前。

来源

2011-03-26 MaheshBabu

是查询你100％地肯定“数据库”变量包含你正在检查的数据库的确切路径在sqlite经理？ – enriquein 2011-03-26 06:07:09

是的，我添加数据库，在iphone模拟器的应用程序，在我找到我的数据库的文件，我将它添加到sqlite管理器 – MaheshBabu 2011-03-26 06:19:48

此函数返回TRUE？ – 2011-03-26 06:56:23

您可以使用sqlite3_exec（）方法而不是sqlite3_step（）。

sqlite3_exec（）将执行您提供的任何查询。

我相信，它一定会帮助你。

-(BOOL)createNewTable 
{ 
    NSArray *array=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
NSString *filePath=[array objectAtIndex:0]; 

filePath =[filePath stringByAppendingPathComponent:@"yourdatabase.db"]; 

NSFileManager *manager=[NSFileManager defaultManager]; 

BOOL success = NO; 
if ([manager fileExistsAtPath:filePath]) 
{ 
    success =YES; 
} 
if (!success) 
{ 
    NSString *path2=[[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"yourdatabase.db"]; 
    success =[manager copyItemAtPath:path2 toPath:filePath error:nil]; 
} 
createStmt = nil; 
NSString *[email protected]"SecondTable"; 
if (sqlite3_open([filePath UTF8String], &database) == SQLITE_OK) { 
    if (createStmt == nil) { 

     NSString *query=[NSString stringWithFormat:@"create table %@(rollNo integer, name text)",tableName]; 

     if (sqlite3_prepare_v2(database, [query UTF8String], -1, &createStmt, NULL) != SQLITE_OK) { 
      return NO; 
     } 
     sqlite3_exec(database, [query UTF8String], NULL, NULL, NULL); 
     return YES; 
    } 
} 
return YES; 
}

来源

2011-03-26 08:47:31

进出口张贴的答案，以及因为没有错误在你的例子处理，这似乎宝贵

INIT DB：

self.databasePath = [[NSString alloc]init]; 
    BOOL success; 
    NSFileManager *fileManager = [NSFileManager defaultManager]; 
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
    NSString *documentsDirectory = [paths objectAtIndex:0]; 
    NSString *writableDBPath = [documentsDirectory stringByAppendingPathComponent:@"myDB.db"]; 
    success = [fileManager fileExistsAtPath:writableDBPath]; 

    self.databasePath = writableDBPath; 

    NSFileManager *filemgr = [NSFileManager defaultManager]; 

    if ([filemgr fileExistsAtPath: self.databasePath ] == NO) 
    { 
     const char *dbpath = [self.databasePath UTF8String]; 

     if (sqlite3_open(dbpath, &myDB) == SQLITE_OK) 
     { 
      NSLog(@"Database Opened"); 

      sqlite3_close(myDB); 

     } else { 
      NSLog(@"Failed to open/create database"); 
     } 
    }else { 
//  NSLog(@"File exist"); 
    }

进行呼叫创建表：

const char *dbpath = [self.databasePath UTF8String]; 

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

     NSString *charsTableNameQuery = [NSString stringWithFormat:@"CREATE TABLE IF NOT EXISTS %@(id INTEGER PRIMARY KEY, charName TEXT)",charsTableName]; 

     int results = 0; 

     //create all chars tables 
     const char *charsTableNameQuerySQL = [charsTableNameQuery UTF8String]; 
     sqlite3_stmt * charsTableNameStatment = nil; 
     results = sqlite3_exec(myDB, charsTableNameQuerySQL, NULL, NULL, NULL); 
     if (results != SQLITE_DONE) { 
      const char *err = sqlite3_errmsg(tekkenDB); 
      NSString *errMsg = [NSString stringWithFormat:@"%s",err]; 
      if (![errMsg isEqualToString:@"not an error"]) { 
       NSLog(@"createTables-chartables error: %@",errMsg); 
       return FALSE; 
      } 
     } 

     sqlite3_finalize(charsTableNameStatment); 
     sqlite3_close(myDB); 

     return TRUE; 
    }else{ 
     NSLog(@"database not opened"); 
    } 
    return FALSE; 
}

来源

2012-08-15 19:39:42

-1

NSString * docsDict; NSArray * dirPath;

//Get the Dictionary 
dirPath = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask,YES); 
docsDict = dirPath[0]; 
NSLog(@"Path : %@",docsDict); 

//Build the path to keep the database 
_database = [[NSString alloc] initWithString:[docsDict stringByAppendingPathComponent:@"myUser.sql"]]; 

NSFileManager *fileMngr= [NSFileManager defaultManager]; 

if([fileMngr fileExistsAtPath:_database] == NO) 
    { 
    const char *dbpath = [_database UTF8String]; 

    if(sqlite3_open(dbpath, &_DB) == SQLITE_OK) 
     { 
     char *errorMassage; 
     const char *sql_statement = "CREATE TABLE IF NOT EXISTS users (ID INTEGER PRIMARY KEY AUTOINCREMENT, FIRSTNAME TEXT, LASTNAME TEXT , MOBILENO TEXT)"; 

    if (sqlite3_exec(_DB,sql_statement,NULL,NULL,&errorMassage)!= SQLITE_OK) 
     { 
      [self showUIAlertWithMessage:@"Failed to create the table" andTitle:@"error"]; 
     } 
      sqlite3_close(_DB); 
    } 
    else 
     { 
     [self showUIAlertWithMessage:@"Failed to open/create the table" andTitle:@"Error"]; 
     } 
}

来源

2016-04-20 17:44:11

呼叫接收memmory警告

(IBAction)findContact:(UIButton *)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)]; 
      _phoneNo.text = phoneField; 
      _status.text = @"Match Found"; 
     }else{ 
      _status.text = @"Match not found"; 
      _address.text = @""; 
      _phoneNo.text = @""; 
     } 
     sqlite3_finalize(statement); 
    } 
    sqlite3_close(contactDB); 
    } 

}

来源

2016-12-16 02:32:58

创建桥接报头（YOURFILENAME桥接-Header.h）

objc文件粘贴到你的CustomDB.m文件的代码。（“CustomDB.m” < - 这是我的文件名）

#import "CustomDB.h" 

     @implementation CustomDB 

     - (void)createWith:(NSString *)strFileName; 
     { 
      NSArray *path = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
      NSString *docPath = [path objectAtIndex:0]; 

      dbPathString = [docPath stringByAppendingPathComponent:strFileName]; 
      NSLog(@"%@",dbPathString); 
      char *error; 

      NSFileManager *fileManager = [NSFileManager defaultManager]; 
      if (![fileManager fileExistsAtPath:dbPathString]) { 
       const char *dbPath = [dbPathString UTF8String]; 

       //creat db here 
       if (sqlite3_open(dbPath, &personDB)==SQLITE_OK) { 
        const char *sql_stmt = "CREATE TABLE IF NOT EXISTS PERSONS (ID INTEGER PRIMARY KEY AUTOINCREMENT, NAME TEXT, AGE TEXT)"; 
        sqlite3_exec(personDB, sql_stmt, NULL, NULL, &error); 
        sqlite3_close(personDB); 
       } 
      } 
     } 
     -(void)insertInToDB:(NSString *)strQuery{ 
      char *error; 
      if (sqlite3_open([dbPathString UTF8String], &personDB)==SQLITE_OK) { 
       NSString *inserStmt = [NSString stringWithFormat:@"%@", strQuery]; 
       const char *insert_stmt = [inserStmt UTF8String]; 

       if (sqlite3_exec(personDB, insert_stmt, NULL, NULL, &error)==SQLITE_OK) { 
        NSLog(@"Insert successfully"); 
       } 
       sqlite3_close(personDB); 
      } 



     } 
     -(NSArray *)selectFromDB:(NSString *)strQuery{ 
      sqlite3_stmt *statement; 
      id result; 
      NSMutableArray *thisArray = [[NSMutableArray alloc]init]; 

      if (sqlite3_open([dbPathString UTF8String], &personDB)==SQLITE_OK) { 

       NSString *querySql = [NSString stringWithFormat:@"SELECT * FROM PERSONS"]; 
       const char* query_sql = [querySql UTF8String]; 

       if (sqlite3_prepare(personDB, query_sql, -1, &statement, NULL)==SQLITE_OK) { 
        while (sqlite3_step(statement)==SQLITE_ROW) { 
         NSMutableDictionary *thisDict = [[NSMutableDictionary alloc]init]; 
         for (int i = 0 ; i < sqlite3_column_count(statement) ; i++) { 
          if(sqlite3_column_type(statement,i) == SQLITE_NULL){ 
           continue; 
          } 
          if (sqlite3_column_decltype(statement,i) != NULL && 
           strcasecmp(sqlite3_column_decltype(statement,i),"Boolean") == 0) { 
           result = [NSNumber numberWithBool:(BOOL)sqlite3_column_int(statement,i)]; 
          } else if (sqlite3_column_type(statement,i) == SQLITE_INTEGER) { 
           result = [NSNumber numberWithInt:(int)sqlite3_column_int(statement,i)]; 
          } else if (sqlite3_column_type(statement,i) == SQLITE_FLOAT) { 
           result = [NSNumber numberWithFloat:(float)sqlite3_column_double(statement,i)]; 
          } else { 
           if((char *)sqlite3_column_text(statement,i) != NULL){ 
            result = [[NSString alloc] initWithUTF8String:(char *)sqlite3_column_text(statement,i)]; 
            [thisDict setObject:result 
               forKey:[NSString stringWithUTF8String:sqlite3_column_name(statement,i)]]; 
            result = nil; 
           } 
          } 
          if (result) { 
           [thisDict setObject:result 
              forKey:[NSString stringWithUTF8String:sqlite3_column_name(statement,i)]]; 
          } 
         } 
         [thisArray addObject:[NSDictionary dictionaryWithDictionary:thisDict]]; 
        } 
       } 
      } 
      return thisArray; 
     } 
     -(void)deleteFromDB:(NSString *)strQuery{ 
      char *error; 

      if (sqlite3_exec(personDB, [strQuery UTF8String], NULL, NULL, &error)==SQLITE_OK) { 
       NSLog(@"Person deleted"); 
      } 
     } 
     @end 

// paste this code in your CustomDB.h file. ("CustomDB.h" <- this is my file name) 

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

@interface CustomDB : NSObject 
{ 
    sqlite3 *personDB; 
    NSString *dbPathString; 
} 
-(void)createWith:(NSString *)strFileName; 
-(void)insertInToDB:(NSString*)strQuery; 
-(NSArray *)selectFromDB:(NSString *)strQuery; 
-(void)deleteFromDB:(NSString*)strQuery; 
@end

不要忘了在你的桥接报头添加此行 - >＃进口“CustomDB.h”和添加在源码框架你的项目... :)

享受这些创建，插入，删除，并选择在SQLite数据库:)

来源

2017-09-21 12:14:37

如何以编程方式在sqlite数据库中创建表格

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