#import <sqlite3.h>@interface ViewController (){ sqlite3 *_sqldb;}@end@implementation ViewController- (void)viewDidLoad{ [super viewDidLoad]; // Do any additional setup after loading the view, typically from a nib. [self OpenDb]; [self createTable]; [self insertData]; [self FindData];}//打開數據庫-(void)OpenDb{  NSArray *arrs= NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); //創建數據庫，如果數據庫存在就直接打開，不存在就創建打開 NSString *path=[arrs lastObject] ; NSString *documentpath= [path stringByAppendingPathComponent:@"sql.db"]; int reslut= sqlite3_open([documentpath UTF8String], &_sqldb); if(reslut==SQLITE_OK){ NSLog(@"數據庫已被打開"); } }//通過數據庫實例創建表-(void)createTable{ //不帶參數的sql語句 const char* sql="create table if not exists t_person (id integer primary key autoincrement,name text,age integer);"; char *error; //sqlite3_exec可以執行一切不帶參數的SQL語句。如果是帶參數最好不用，防止SQL注入漏洞攻擊 int resutl= sqlite3_exec(_sqldb, sql, NULL, NULL, &error); if(resutl==SQLITE_OK){ NSLog(@"創建表成功"); }else{ NSLog(@"創建表失敗－－》%s",error);}}//插入數據-(void)insertData{ //帶參數的SQL語句 "?"是帶參數的占位符 const char * sql="insert into t_person(name,age) values(?,?);"; sqlite3_stmt *stmp; //在執行SQL語句之前檢查SQL語句語法,-1代表字符串的長度 int result= sqlite3_prepare_v2(_sqldb, sql, -1, &stmp, NULL); if(result==SQLITE_OK){ NSLog(@"插入SQL語句語法沒有問題"); //綁定參數,插入的參數的下標是從1開始 sqlite3_bind_text(stmp, 1, "gcb", -1, NULL); sqlite3_bind_int(stmp, 2, 12);  //執行參參數的SQL語句，不能有exec int result=sqlite3_step(stmp); //插入進行判斷,要用sqLite_Done來判斷 if(result==SQLITE_DONE){  NSLog(@"插入成功"); } else{  NSLog(@"插入失敗") ; }  } else{ NSLog(@"插入SQL語句有問題"); }}-(void)FindData{ char *sql="select id,name,age from t_person"; //查詢做好用step執行 sqlite3_stmt *stmt; //檢查SQL語句的語法問題 int result= sqlite3_prepare_v2(_sqldb, sql, -1, &stmt, NULL); if(result==SQLITE_OK){ while (sqlite3_step(stmt)==SQLITE_ROW) {  //查詢的列是0開始 插入的列從1開始//  int xh＝sqlite3_column_int(stmt, 0);  int xh=sqlite3_column_int(stmt, 0);  char * name=(char *)sqlite3_column_text(stmt, 1);  int age=sqlite3_column_int(stmt, 2);  NSLog(@"xh=%i-->name=%s-->age=%i",xh,name,age);       } } else{ NSLog(@"查詢SQL語法有誤"); }}