UI 19 数据库的练习

对于电影做操作,在点击收藏时, 判断其是否被收藏.

并且删除, 插入喜爱的电影.

新建一个DataBaseTool

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

typedef NS_ENUM(NSUInteger, SelectInTable) {
    inTable,
    NotInTable,
    SelectError,
};

@interface DataBaseTool : NSObject
{
    sqlite3 *dbPoint;
}

+ (DataBaseTool *)shareDataBaseTool;
// 打开数据库
//- (void)openDB;
//- (void)createTable;

- (SelectInTable)isSaveWithMovie:(MovieModel *)movie;
- (void)insertDataWithMovie:(MovieModel *)movie;
- (void)deleteDataWithMovie:(MovieModel *)movie;

内部实现:

#import "DataBaseTool.h"

@implementation DataBaseTool

+ (DataBaseTool *)shareDataBaseTool{
    static DataBaseTool *dataTool;
    static dispatch_once_t oneToKen;
    dispatch_once(&oneToKen, ^{
        dataTool = [[DataBaseTool alloc] init];
        [dataTool openDB];
        [dataTool createTable];

    });
    return dataTool;
}

- (void)openDB{

    NSArray *sandBox = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *sandBoxPath = sandBox[0];
    NSString *document = [sandBoxPath stringByAppendingPathComponent:@"Favorite.sqlite"];

    int result = sqlite3_open([document UTF8String], &dbPoint);

    if (result == SQLITE_OK) {
        NSLog(@"数据库打开成功!");
    }else{
        NSLog(@"数据库关闭成功!");
    }
}

- (void)createTable{

    NSString *sqlStr = @"create table if not exists movie (number integer primary key autoincrement, movieID text, movieName text, pic_url text)";
    int result = sqlite3_exec(dbPoint, [sqlStr UTF8String], nil, nil, nil);
    if (result == SQLITE_OK) {
        NSLog(@"电影表创建成功!");
    }else{
        NSLog(@"电影表创建失败!%d",result);
    }
}

- (SelectInTable)isSaveWithMovie:(MovieModel *)movie{
    NSString *sqlStr =[NSString stringWithFormat:@"select * from movie where movieID = ‘%@‘",movie.movieID];
    sqlite3_stmt *stmt = nil;
    int result = sqlite3_prepare_v2(dbPoint, [sqlStr UTF8String], -1, &stmt, nil);
    if (result == SQLITE_OK) {
        NSLog(@"查询成功!");
        if (sqlite3_step(stmt) == SQLITE_ROW) {
            return inTable;
        }else{
            return NotInTable;
        }
    }else{
        NSLog(@"查询失败!");
    }
    return SelectError;
}

- (void)insertDataWithMovie:(MovieModel *)movie{

    NSString *sqlStr = [NSString stringWithFormat:@"insert into movie (movieID, movieName, pic_url)values (‘%@‘,‘%@‘,‘%@‘)",movie.movieID, movie.movieName, movie.pic_url];
    int result = sqlite3_exec(dbPoint, [sqlStr UTF8String], nil, nil, nil);
    if (result == SQLITE_OK) {
        NSLog(@"加入成功");
    }else{
        NSLog(@"加入失败!");
    }

}

- (void)deleteDataWithMovie:(MovieModel *)movie{

    NSString *sqlStr = [NSString stringWithFormat:@"delete from movie where movieID = ‘%@‘",movie.movieID];
    int result = sqlite3_exec(dbPoint, [sqlStr UTF8String], nil, nil, nil);
    if (result == SQLITE_OK) {
        NSLog(@"删除成功!");
    }else{
        NSLog(@"删除失败!");
    }
}

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