FMDB

最新推荐文章于 2024-11-09 11:48:45 发布

原创最新推荐文章于 2024-11-09 11:48:45 发布 · 368 阅读

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// LKViewController.m

// 01-FMDB01-基本使用

// Created by apple on 14-7-25.

#import "ViewController.h"

#import "FMDB.h"

@interface ViewController ()

@property (nonatomic, strong) FMDatabase *db;

@end

@implementation ViewController

- (void)viewDidLoad

{

[super viewDidLoad];

// 1.获得数据库文件的路径

NSString *doc = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];

NSString *filename = [doc stringByAppendingPathComponent:@"students.sqlite"];

// 2.得到数据库

FMDatabase *db = [FMDatabase databaseWithPath:filename];

// 3.打开数据库

if ([db open]) {

// 4.创表

BOOL result = [db executeUpdate:@"CREATE TABLE IF NOT EXISTS t_student (id integer PRIMARY KEY AUTOINCREMENT, name text NOT NULL, age integer NOT NULL);"];

if (result) {

NSLog(@"成功创表");

} else {

NSLog(@"创表失败");

}

self.db = db;

}

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event

{

[self delete];

[self insert];

[self query];

}

- (void)insert

{

for (int i = 0; i<10; i++) {

NSString *name = [NSString stringWithFormat:@"jack-%d", arc4random_uniform(100)];

// executeUpdate : 不确定的参数用?来占位

[self.db executeUpdate:@"INSERT INTO t_student (name, age) VALUES (?, ?);", name, @(arc4random_uniform(40))];

// [self.db executeUpdate:@"INSERT INTO t_student (name, age) VALUES (?, ?);" withArgumentsInArray:@[name, @(arc4random_uniform(40))]];

// executeUpdateWithFormat : 不确定的参数用%@、%d等来占位

// [self.db executeUpdateWithFormat:@"INSERT INTO t_student (name, age) VALUES (%@, %d);", name, arc4random_uniform(40)];

}

- (void)delete

{

// [self.db executeUpdate:@"DELETE FROM t_student;"];

[self.db executeUpdate:@"DROP TABLE IF EXISTS t_student;"];

[self.db executeUpdate:@"CREATE TABLE IF NOT EXISTS t_student (id integer PRIMARY KEY AUTOINCREMENT, name text NOT NULL, age integer NOT NULL);"];

}

- (void)query

{

// 1.执行查询语句

FMResultSet *resultSet = [self.db executeQuery:@"SELECT * FROM t_student"];

// 2.遍历结果

while ([resultSet next]) {

int ID = [resultSet intForColumn:@"id"];

NSString *name = [resultSet stringForColumn:@"name"];

int age = [resultSet intForColumn:@"age"];

NSLog(@"%d %@ %d", ID, name, age);

}

@end