【非凡程序员】 OC第十八节课 （数据库mysql和sqlite3的应用）

在代码中应用sqlite3

ViewController.h文件

#import <UIKit/UIKit.h>
#import "sqlite3.h"

@interface ViewController : UIViewController

{
    sqlite3 * link;
   
    NSString *path;

}

@end

ViewController.m文件：

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
   
    //把person.db文件的地址给path
    path =@"Users/feifanjiaoyu/Desktop/person.db";
    //确定好库文件,打开数据库的链接
    sqlite3_open([path UTF8String],&link);
    //创建
    NSString *creat=@" create * table student(name varcahr(20),age int)";
    //执行SQL语句
    sqlite3_exec(link, [creat UTF8String],nil,nil,nil);
    //插入
    NSString *insert = @"insert into student(name,age) values('zhangsuiping',17)";
    sqlite3_exec(link, [insert UTF8String],nil,nil                                                                                                                                                                                                                                                                                                     ,nil);
    //更新
    NSString *update=@"update student set age=19 where name='zhangsuiping'";
    sqlite3_exec(link, [update UTF8String],nil,nil,nil);
    //删除
    NSString *delete=@"delete from student where age=19";
    sqlite3_exec(link, [delete UTF8String],nil,nil,nil);
   
    //查询
    sqlite3_stmt *assss;
    NSString *select = @"select *from student";
    //预编译检查SQL语句
    sqlite3_prepare_v2(link, [select UTF8String], -1, &assss, nil);
    while (sqlite3_step(assss)==SQLITE_ROW)
    {
        NSLog(@"%s %s",sqlite3_column_text(assss, 0),sqlite3_column_text(assss, 1) );
        //－－－打印每一行纪录的第一列和第二列的值
    }
    // 关闭
    sqlite3_close(link);
   
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end