代码改变世界

iOS SQLite增删改查(简单应用)

2015-11-09 11:05  甘雨路  阅读(234)  评论(0编辑  收藏  举报

 // 注意: 在工程里导入libsqlite3.tbd库(Xcode7,如果Xcode7以下的版本则导入libsqlite3.dylib).




#import
<UIKit/UIKit.h> @interface AppDelegate : UIResponder <UIApplicationDelegate> @property (strong, nonatomic) UIWindow *window; @end
#import "AppDelegate.h"
#import "RootViewController.h"
@interface AppDelegate ()

@end

@implementation AppDelegate


- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    // Override point for customization after application launch.
    self.window.backgroundColor = [UIColor whiteColor];
    
    self.window.rootViewController = [[RootViewController alloc] init];
    
    [self.window makeKeyAndVisible];
    return YES;
}




@end
#import <UIKit/UIKit.h>

@interface RootViewController : UIViewController

@end
#import "RootViewController.h"
#import "PersonInfo.h"
#import "SQLManager.h"

@interface RootViewController ()


@end

@implementation RootViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    SQLManager *sqlManage = [[SQLManager alloc] init];

//    PersonInfo *person1 = [[PersonInfo alloc] init];
//    person1.identifierNumber = 0001;
//    person1.name = @"lf";
//    person1.hoby = @"basketball";
//    person1.address = @"广州";
//    person1.age = 21;
//
//    BOOL success = [sqlManage insertPersonInfoList:person1];
//    if (success) {
//        NSLog(@"成功存储");
//    }
//    PersonInfo *person2 = [[PersonInfo alloc] init];
//    person2.identifierNumber = 0002;
//    person2.name = @"gl";
//    person2.hoby = @"sleep";
//    person2.address = @"湖北";
//    person2.age = 18;
//    [sqlManage insertPersonInfoList:person2];
    
    PersonInfo *person3 = [[PersonInfo alloc] init];
    person3.identifierNumber = 0003;
    person3.name = @"wh";
    person3.hoby = @"smile";
    person3.address = @"广东";
    person3.age = 16;
//    BOOL success =  [sqlManage updatePersonInfoList:person3];
//    if (success) {
//        NSLog(@"更新成功");
//    }else{
//        NSLog(@"更新失败");
//    }
//
//    NSMutableArray *arr = [sqlManage getPersonInfoList];
//    BOOL isDelete = [sqlManage deletePersonInfo:person3];
//    if (isDelete) {
//        NSLog(@"删除成功");
//    }else{
//        NSLog(@"删除失败");
//    }
//    
//    NSMutableArray *Marr = [sqlManage getPersonInfoList];

    
//    NSMutableArray *arr = [sqlManage getPersonInfoList];
//    NSMutableArray *result = [sqlManage searchPersonInfoListByName:@"lf"];
//    NSLog(@"查询的结果为:%@",result);
}

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



@end
#import <Foundation/Foundation.h>
#import <sqlite3.h>

@class PersonInfo;

@interface SQLManager : NSObject

@property (nonatomic) sqlite3 *database;

// 创建数据库
- (BOOL)createPersonInfoList:(sqlite3 *)db;

// 插入数据
- (BOOL) insertPersonInfoList:(PersonInfo *)personInfo;

// 获取数据
- (NSMutableArray *)getPersonInfoList;

// 查询数据
- (NSMutableArray *)searchPersonInfoListByName:(NSString *)name;

// 更新数据
- (BOOL)updatePersonInfoList:(PersonInfo *)updatePersonInfo;

// 删除数据
- (BOOL)deletePersonInfo:(PersonInfo *)deletePersonInfo;

@end
#import "SQLManager.h"
#import "PersonInfo.h"

#define FileName @"personInfo.sqlite" //这里很神奇,可以定义成任何类型的文件,也可以不定义成.db文件,任何格式都行,定义成.sb文件都行,达到了很好的数据隐秘性


@implementation SQLManager

@synthesize database;

- (instancetype)init
{
    self = [super init];
    if (self) {
        
    }
    return self;
}

// 获取document目录并返回数据库目录
- (NSString *)dataFilePath{
    NSString *path = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
    NSLog(@"数据库当前路径为:%@",path);
    return [path stringByAppendingPathComponent:FileName];
}

// 创建,打开数据库
- (BOOL)openDB{
    // 获取数据库路径
    NSString *path = [self dataFilePath];
    // 文件管理器
    NSFileManager *fileManager = [NSFileManager defaultManager];
    // 判断数据库是否存在
    BOOL find = [fileManager fileExistsAtPath:path];
    //如果数据库存在,则用sqlite3_open直接打开(不要担心,如果数据库不存在sqlite3_open会自动创建)
    if (find) {
        NSLog(@" 数据库文件已存在!");
        
        //打开数据库,这里的[path UTF8String]是将NSString转换为C字符串,因为SQLite3是采用可移植的C(而不是Objective-C)编写的,它不知道什么是NSString.
        if (sqlite3_open([path UTF8String], &database) != SQLITE_OK) {
            //如果打开数据库失败则关闭数据库
            sqlite3_close(database);
            NSLog(@"数据库打开失败!");
            return NO;
        }else{
            NSLog(@"数据库打开成功!");
            //  创建列表
            [self createPersonInfoList:database];
            return YES;
        }
    }
    //如果发现数据库不存在则利用sqlite3_open创建数据库(上面已经提到过),与上面相同,路径要转换为C字符串
    if (sqlite3_open([path UTF8String], &database) == SQLITE_OK) {
        // 创建列表
        [self createPersonInfoList:database];
        return YES;
    }else{
        //如果创建并打开数据库失败则关闭数据库
        sqlite3_close(database);
        NSLog(@"数据库打开失败 ~~");
        return NO;
    }
    return NO;
}
- (BOOL)createPersonInfoList:(sqlite3 *)db{
    //这句是大家熟悉的SQL语句
    //把identifierNumber设置为主键,主键是唯一表示该对象(每个对象的主键不能相同)
    char *sql = "create table if not exists PersonInfoTable (identifierNumber INTEGER PRIMARY KEY AUTOINCREMENT,name text,address text, hoby text,age int)";// name是列名,text 是数据类型
    
    sqlite3_stmt *statement;
    //sqlite3_prepare_v2 接口把一条SQL语句解析到statement结构里去. 使用该接口访问数据库是当前比较好的的一种方法
    NSInteger sqlReturn = sqlite3_prepare_v2(database, sql, -1, &statement, nil);
    //第一个参数跟前面一样,是个sqlite3 * 类型变量,
    //第二个参数是一个 sql 语句。
    //第三个参数我写的是-1,这个参数含义是前面 sql 语句的长度。如果小于0,sqlite会自动计算它的长度(把sql语句当成以\0结尾的字符串)。
    //第四个参数是sqlite3_stmt 的指针的指针。解析以后的sql语句就放在这个结构里。
    //第五个参数是错误信息提示,一般不用,为nil就可以了。
    //如果这个函数执行成功(返回值是 SQLITE_OK 且 statement 不为NULL ),那么下面就可以开始插入二进制数据。
    
    //如果SQL语句解析出错的话程序返回
    if (sqlReturn != SQLITE_OK) {
        NSLog(@"创建数据库表失败");
        return NO;
    }
    
    // 执行SQL语句
    int success = sqlite3_step(statement);
    //释放sqlite3_stmt
    sqlite3_finalize(statement);
    
    //执行SQL语句失败
    if (success != SQLITE_DONE) {
        NSLog(@"没有成功创建数据库");
        return NO;
    }
    NSLog(@"成功创建数据库");
    return YES;
}

// 插入数据
- (BOOL)insertPersonInfoList:(PersonInfo *)personInfo{
    // 先判断数据库是否打开
    if ([self openDB]) {
        sqlite3_stmt *statement;
        //这个 sql 语句特别之处在于 values 里面有个? 号。在sqlite3_prepare函数里,?号表示一个未定的值,它的值等下才插入。
        static char *sql = "INSERT INTO PersonInfoTable(identifierNumber,name,address,hoby,age) VALUES(?,?,?,?,?)";
        
        int success2 = sqlite3_prepare_v2(database, sql, -1, &statement, NULL);
        if (success2 != SQLITE_OK) {
            NSLog(@"数据插入失败!");
            sqlite3_close(database);
            return NO;
        }
        
        //这里的数字1,2,3代表上面的第几个问号,这里将三个值绑定到三个绑定变量
        //identifierNumber,name,address,hoby,age
        sqlite3_bind_int(statement, 1, personInfo.identifierNumber);
        sqlite3_bind_text(statement, 2, [personInfo.name UTF8String], -1, SQLITE_TRANSIENT);
        sqlite3_bind_text(statement, 3, [personInfo.address UTF8String], -1, SQLITE_TRANSIENT);
        sqlite3_bind_text(statement, 4, [personInfo.hoby UTF8String], -1, SQLITE_TRANSIENT);
        sqlite3_bind_int(statement, 5, personInfo.age);
        
        //执行插入语句
        success2 = sqlite3_step(statement);
        //释放statement
        sqlite3_finalize(statement);
        
        //如果插入失败
        if (success2 == SQLITE_ERROR) {
            NSLog(@"数据插入失败");
            //关闭数据库
            sqlite3_close(database);
            return NO;
        }
        //关闭数据库
        sqlite3_close(database);
        return YES;
    }
    return NO;
}

// 获取数据
- (NSMutableArray *)getPersonInfoList{
    NSMutableArray *array = [[NSMutableArray alloc] init];
    ////判断数据库是否打开
    if ([self openDB]) {
        
        sqlite3_stmt *statement = nil;
        //sql语句
        //identifierNumber,name,address,hoby,age
        char *sql = "SELECT identifierNumber,name,address,hoby,age FROM PersonInfoTable";//从PersonInfoTable这个表中获取 identifierNumber,name,address,hoby,age,若获取全部的话可以用*代替identifierNumber,name,address,hoby,age。
        
        if (sqlite3_prepare_v2(database, sql, -1, &statement, NULL) != SQLITE_OK) {
            NSLog(@"预编译失败");
            return nil;
        }else{
            //查询结果集中一条一条的遍历所有的记录,这里的数字对应的是列值,注意这里的列值,跟上面sqlite3_bind_text绑定的列值不一样!一定要分开,不然会crash,只有这一处的列号不同,注意!
            //identifierNumber,name,address,hoby,age
            while (sqlite3_step(statement) == SQLITE_ROW) {
                PersonInfo *person = [[PersonInfo alloc] init];
                person.identifierNumber = sqlite3_column_int(statement, 0);
                char *name = (char *)sqlite3_column_text(statement, 1);
                person.name = [NSString stringWithUTF8String:name];
                char *address = (char *)sqlite3_column_text(statement, 2);
                person.address = [NSString stringWithUTF8String:address];
                char *hoby = (char *)sqlite3_column_text(statement, 3);
                person.hoby = [NSString stringWithUTF8String:hoby];
                person.age = sqlite3_column_int(statement, 4);
                [array addObject:person];
                NSLog(@"%d--%@--%@--%@--%d",person.identifierNumber,person.name,person.address,person.hoby,person.age);
            }
        }
        //清理statement对象
        sqlite3_finalize(statement);
        // 关闭数据库
        sqlite3_close(database);
    }
    return array;
}

- (NSMutableArray *)searchPersonInfoListByName:(NSString *)name{
    
    NSMutableArray *array = [[NSMutableArray alloc] init];
    //判断数据库是否打开
    if ([self openDB]) {
        
        sqlite3_stmt *statement = nil;
        //sql语句
        NSString *querySQL = [NSString stringWithFormat:@"SELECT * FROM PersonInfoTable WHERE name like \"%@\"",name];
        const char *sql = [querySQL UTF8String];
         //        char *sql = "SELECT * FROM PersonInfoTable WHERE name like ?";//这里用like代替=可以执行模糊查找,原来是"SELECT * FROM PersonInfoTable WHERE name = ?"
        
        if (sqlite3_prepare_v2(database, sql, -1, &statement, NULL) != SQLITE_OK) {
            NSLog(@"查询失败");
            sqlite3_close(database);
            return nil;
        }else{
            sqlite3_bind_text(statement, 2, [name UTF8String], -1, SQLITE_TRANSIENT);
            //查询结果集中一条一条的遍历所有的记录,这里的数字对应的是列值。
            while (sqlite3_step(statement) == SQLITE_ROW) {
                PersonInfo *info = [[PersonInfo alloc] init];
                info.identifierNumber = sqlite3_column_int(statement, 0);
                char *name = (char *)sqlite3_column_text(statement, 1);
                info.name = [NSString stringWithUTF8String:name];
                char *address = (char *)sqlite3_column_text(statement, 2);
                info.address = [NSString stringWithUTF8String:address];
                char *hoby = (char *)sqlite3_column_text(statement, 3);
                info.hoby = [NSString stringWithUTF8String:hoby];
                info.age = sqlite3_column_int(statement, 4);
                [array addObject:info];
                NSLog(@"查询:%d--%@--%@--%@--%d",info.identifierNumber,info.name,info.address,info.hoby,info.age);
            }
        }
        //清理statement对象
        sqlite3_finalize(statement);
        // 关闭数据库
        sqlite3_close(database);
    }
    return array;
}

// 更新数据
- (BOOL)updatePersonInfoList:(PersonInfo *)updatePersonInfo{
    if ([self openDB]) {
        
        sqlite3_stmt *statemnet ;//这相当一个容器,放转化OK的sql语句
        //组织SQL语句
        //identifierNumber,name,address,hoby,age
        char *sql = "REPLACE INTO PersonInfoTable (identifierNumber,name,address,hoby,age) VALUES(?,?,?,?,?)";
        
        //将SQL语句放入sqlite3_stmt中
        int success = sqlite3_prepare_v2(database, sql, -1, &statemnet, NULL);
        if (success != SQLITE_OK) {
            NSLog(@"数据更新失败");
            // 关闭数据库
            sqlite3_close(database);
            return NO;
        }
        
        //这里的数字1,2,3代表第几个问号。这里只有1个问号,这是一个相对比较简单的数据库操作,真正的项目中会远远比这个复杂
        //绑定text类型的数据库数据
        //identifierNumber,name,address,hoby,age
        sqlite3_bind_int(statemnet, 1, updatePersonInfo.identifierNumber);
        sqlite3_bind_text(statemnet, 2, [updatePersonInfo.name UTF8String], -1, SQLITE_TRANSIENT);
        sqlite3_bind_text(statemnet, 3, [updatePersonInfo.address UTF8String], -1, SQLITE_TRANSIENT);
        sqlite3_bind_text(statemnet, 4, [updatePersonInfo.hoby UTF8String], -1, SQLITE_TRANSIENT);
        sqlite3_bind_int(statemnet, 5, updatePersonInfo.age);
        ;
        
        //执行SQL语句。这里是更新数据库
        success = sqlite3_step(statemnet);
        //释放statement
        sqlite3_finalize(statemnet);
        
        //如果执行失败
        if (success == SQLITE_ERROR) {
            NSLog(@"更新的新数据失败");
            sqlite3_close(database);
            return NO;
        }
        //执行成功后依然要关闭数据库
        sqlite3_close(database);
        return YES;
    }
    return NO;
}

// 删除数据
- (BOOL)deletePersonInfo:(PersonInfo *)deletePersonInfo{
    if ([self openDB]) {
        sqlite3_stmt *statement;
        // SQL语句
        //identifierNumber,name,address,hoby,age
        static char  *sql = "delete from PersonInfoTable where identifierNumber = ? and name = ? and address = ? and hoby = ? and age = ?";
        //将SQL语句放入sqlite3_stmt中
        int success = sqlite3_prepare_v2(database, sql, -1, &statement, NULL);
        if (success != SQLITE_OK) {
            NSLog(@"删除数据失败");
            sqlite3_close(database);
            return NO;
        }
        //这里的数字1,2,3代表第几个问号。这里只有1个问号,这是一个相对比较简单的数据库操作,真正的项目中会远远比这个复杂
        sqlite3_bind_int(statement, 1, deletePersonInfo.identifierNumber);
        sqlite3_bind_text(statement, 2, [deletePersonInfo.name UTF8String], -1, SQLITE_TRANSIENT);
        sqlite3_bind_text(statement, 3, [deletePersonInfo.address UTF8String], -1, SQLITE_TRANSIENT);
        sqlite3_bind_text(statement, 4, [deletePersonInfo.hoby UTF8String], -1, SQLITE_TRANSIENT);
        sqlite3_bind_int(statement, 5, deletePersonInfo.age);
        ;
        // 执行SQL语句。这里是删除数据
        success = sqlite3_step(statement);
        //释放statement
        sqlite3_finalize(statement);
        
        //如果执行失败
        if (success == SQLITE_ERROR) {
            NSLog(@"SQL 执行删除数据失败");
            // 关闭数据库
            sqlite3_close(database);
            return NO;
        }
        //执行成功后依然要关闭数据库
        sqlite3_close(database);
        return YES;
    }
    return NO;
}

@end
#import <Foundation/Foundation.h>

@interface PersonInfo : NSObject

@property (strong, nonatomic) NSString *name;
@property (assign, nonatomic) int age;
@property (strong, nonatomic) NSString *address;
@property (assign, nonatomic) int identifierNumber;
@property (strong, nonatomic) NSString *hoby;


@end
#import "PersonInfo.h"

@implementation PersonInfo

@synthesize name;
@synthesize address;
@synthesize hoby;
@synthesize age;
@synthesize identifierNumber;

-(void)dealloc{
    address = nil;
    hoby = nil;
    name = nil;
}

- (id)init
{
    self = [super init];
    if (self) {
        name = @"";
        hoby = @"";
        address = @"";
        age = 0;
        identifierNumber = 0;
    }
    return self;
}

@end