iOS 에서 sqlite 의 상세 한 용법

#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];
}


//     

-(void)OpenDb{
 
 NSArray *arrs= NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
 //     ，            ，        
 NSString *path=[arrs lastObject] ;
 NSString *documentpath= [path stringByAppendingPathComponent:@"sql.db"];
 int reslut= sqlite3_open([documentpath UTF8String], &_sqldb);
 if(reslut==SQLITE_OK){
 NSLog(@"       ");
 }
 
}
//          
-(void)createTable{
 //     sql  
 const char* sql="create table if not exists t_person (id integer primary key autoincrement,name text,age integer);";
 char *error;
 //sqlite3_exec           SQL  。          ，  SQL      
 int resutl= sqlite3_exec(_sqldb, sql, NULL, NULL, &error);
 if(resutl==SQLITE_OK){
 NSLog(@"     ");
 }
else{
 NSLog(@"     －－》%s",error);
}
}

//    
-(void)insertData{
 //    SQL   "?"        
 const char * sql="insert into t_person(name,age) values(?,?);";
 sqlite3_stmt *stmp;
 //   SQL      SQL    ,-1        
 int result= sqlite3_prepare_v2(_sqldb, sql, -1, &stmp, NULL);
 if(result==SQLITE_OK){
 NSLog(@"  SQL        ");
 //    ,          1  
 sqlite3_bind_text(stmp, 1, "gcb", -1, NULL);
 sqlite3_bind_int(stmp, 2, 12);
 
 //      SQL  ，   exec
 int result=sqlite3_step(stmp);
 //      ,  sqLite_Done   
 if(result==SQLITE_DONE){
  NSLog(@"    ");
 }
 else{
  NSLog(@"    ") ;
 }
 
 }
 else{
 NSLog(@"  SQL     ");
 }
}

-(void)FindData{
 char *sql="select id,name,age from t_person";
 //     step  
 sqlite3_stmt *stmt;
 //  SQL       
 int result= sqlite3_prepare_v2(_sqldb, sql, -1, &stmt, NULL);
 if(result==SQLITE_OK){
 while (sqlite3_step(stmt)==SQLITE_ROW) {
  //     0        1  
//  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(@"  SQL    ");
 }

}