1 控制器代码： 2 #import "ViewController.h" 3 #import "DatabaseHelper.h" 4  5 @interface ViewController () 6 { 7      sqlite3 *db; 8 } 9 @end10 11 @implementation ViewController12 13 -(void)loadView {14 15     [super loadView];16     self.view.backgroundColor = [UIColor orangeColor];17 }18 - (void)viewDidLoad {19     [super viewDidLoad];20     //PART1：该部分为实现的帮助类别21     //PART1 .122   [DatabaseHelper openDatabaseWithName:@"personinfo.sqlite" withSqlite:db];23     //PART1 .224    db =[DatabaseHelper openDatabaseWithName:@"personinfo.sqlite" withSqlite:db]; 
25 NSLog(@" isOpenOrCreat = %@",db ?@"sucess":@"failure");
26
27 //PART2：用以判断数据库是否打开
28 if (db) {
29 
30  } 
31 
32 //PART3：用以判断数据库是否打开 
33 [DatabaseHelper execSql:@"CREATE TABLE IF NOT EXISTS PERSONINFO (ID INTEGER PRIMARY KEY AUTOINCREMENT, name TEXT, age INTEGER, address TEXT)" withSqlite:db];

 1 操作类代码： 2 #import "DatabaseHelper.h" 3  4 @implementation DatabaseHelper 5 +(sqlite3 *)openDatabaseWithName:(NSString *)name  withSqlite:(sqlite3 *)sqlite3{ 6     //PART5： 7     //1、获取Documents文件路径 8     NSString *documentsPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)lastObject]; 9     //2、拼接要建立的数据库文件路径10     NSString *databasePath = [documentsPath stringByAppendingPathComponent:name];11     //打印12     NSLog(@"databasePath = %@",databasePath);13     //判断是否已经打开（打开失败时关闭数据库并log提示）14     if (sqlite3_open([databasePath UTF8String], &sqlite3) != SQLITE_OK) {15         sqlite3_close(sqlite3);16         NSLog(@"数据库打开失败");17         return nil ;18     }19 20 //PART4：21 //    char *err;22 //    NSString *sql = @"CREATE TABLE IF NOT EXISTS PERSONINFO (ID INTEGER PRIMARY KEY AUTOINCREMENT, name TEXT, age INTEGER, address TEXT)";23 //    if (sqlite3_exec(sqlite3, [sql UTF8String], NULL, NULL, &err) != SQLITE_OK) {24 //        sqlite3_close(sqlite3);25 //        NSLog(@"数据库操作数据失败!");26 //        NSLog(@"%s ",err);27 //    }28 29     return  sqlite3;30 }31 32 +(BOOL)execSql:(NSString *)sql  withSqlite:(sqlite3 *)sqlite3{33     char *err;34     //sqlite3_exec(),   执行非查询的sql语句35     if (sqlite3_exec(sqlite3, [sql UTF8String], NULL, NULL, &err) != SQLITE_OK) {36         sqlite3_close(sqlite3);37         NSLog(@"数据库操作数据失败!");38         return NO;39     }40     return YES;41 42 }