在IOS中使用Sqlite来处理数据。如果你已经了解了SQL，那你可以很容易的掌握SQLite数据库的操作。iOS对于数据库的操作：增加、删除、查找、修改具体介绍如下所示：
首先需要创建一个数据库：本程序的数据库是在火狐浏览器里的插件里写的微量型数据库
火狐找查找SQLite Manager的步骤：
第一步：在工具栏找到附加组件，点击进入
第二步：搜索 SQP，找到并下载，安装完成之后需要重启浏览器
第三步：在工具只乐观找到SQLite Manager，点击打开
SQLite Manager界面如图所示
注：SQLite Manager是微量型的数据库编程软件，所以一次只能执行一句代码！！！
•创建数据库
--数据库的建立
create table team
( -- 创建名字为team的table stu_id integer primary key autoincrement, stu_name varchar(100), stu_password varchar(100), stu_login varchar(100) )--添加信息 insert into team(stu_name,stu_password,stu_login) values('xiaming','123456','xm') insert into team(stu_name,stu_password,stu_login) values('zhangsan','123456',' zs') --查询信息select *from team --删除信息delete from team where stu_id=3
工程目录文件如下：
这里需要导入一个系统自带的文件libsqlite3.0.tbd
步骤如图：
•实现工程
ViewController.h
#import <UIKit/UIKit.h> #import <sqlite3.h> @interface ViewController : UIViewController @property(strong,nonatomic)UIButton *showbtn; @property(strong,nonatomic)UIButton *insertbtn; @property(strong,nonatomic)UIButton *updatebtn; @property(strong,nonatomic)UIButton *deletebtn; @end
ViewController.h
#import "ViewController.h"
#define PATH [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject] stringByAppendingPathComponent:@"team.sqlite"]
@interface ViewController ()
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
// 获取沙盒 Documents文件路径
NSLog(@"%@",[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject]);
[self button];
}
-(void)button
{
self.showbtn=[UIButton buttonWithType:UIButtonTypeSystem];
self.showbtn.frame=CGRectMake(100, 50, 200, 50);
[self.showbtn setTitle:@"数据库显示" forState:UIControlStateNormal];
[self.showbtn addTarget:self action:@selector(showSql) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:self.showbtn];
self.insertbtn=[UIButton buttonWithType:UIButtonTypeSystem];
self.insertbtn.frame=CGRectMake(100, 100, 200, 50);
[self.insertbtn setTitle:@"数据库添加" forState:UIControlStateNormal];
[self.insertbtn addTarget:self action:@selector(insertSql) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:self.insertbtn];
self.updatebtn=[UIButton buttonWithType:UIButtonTypeSystem];
self.updatebtn.frame=CGRectMake(100, 150, 200, 50);
[self.updatebtn setTitle:@"数据库修改" forState:UIControlStateNormal];
[self.updatebtn addTarget:self action:@selector(updateSql) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:self.updatebtn];
self.deletebtn=[UIButton buttonWithType:UIButtonTypeSystem];
self.deletebtn.frame=CGRectMake(100, 200, 200, 50);
[self.deletebtn setTitle:@"数据库删除" forState:UIControlStateNormal];
[self.deletebtn addTarget:self action:@selector(deleteSql) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:self.deletebtn];
}
#pragma mark - 显示数据表中的所有信息
-(void)showSql
{
NSLog(@"显示数据库信息");
// 数据库
sqlite3 *db;
// 根据指定的数据库文件存储路径打开数据库
int result=sqlite3_open([PATH UTF8String], &db);
// 创建执行命令对象
sqlite3_stmt *stmt;
// 打开数据库成功
if (result==SQLITE_OK) {
NSLog(@"连接成功");
// 执行预处理命令
int res=sqlite3_prepare_v2(db, "select *from team", -1, &stmt, nil);
if (res==SQLITE_OK) {
// 循环遍历数据表的行信息
while (sqlite3_step(stmt)==SQLITE_ROW) {
// 获取数据表中整型列的信息
int stu_id=sqlite3_column_int(stmt, 0);
NSLog(@"stu_id is %d",stu_id);
// 获取数据表中字符型的列的信息
NSLog(@"%@",[NSString stringWithFormat:@"%s",sqlite3_column_text(stmt, 1)]);
NSLog(@"%@",[NSString stringWithFormat:@"%s",sqlite3_column_text(stmt, 2)] );
NSLog(@"%@",[NSString stringWithFormat:@"%s",sqlite3_column_text(stmt, 3)] );
}
}
}
}
#pragma mark -增加信息
-(void)insertSql
{
sqlite3 *db;
sqlite3_stmt *stmt;
sqlite3_open([PATH UTF8String], &db);
int rst=sqlite3_prepare_v2(db, "insert into team(stu_name,stu_password,stu_login) values(?,?,?)", -1, &stmt, nil);
sqlite3_bind_text(stmt, 1, "wangwu", -1, nil);
sqlite3_bind_text(stmt, 2, "123456", -1, nil);
sqlite3_bind_text(stmt, 3, "ww", -1, nil);
// 判断是否增加成功
if (rst==SQLITE_OK) {
if (SQLITE_DONE==sqlite3_step(stmt)) {
NSLog(@"add ok");
}else{
NSLog(@"add fail");
}
}
}
#pragma mark - 修改数据库
-(void)updateSql
{
sqlite3 *db;
sqlite3_stmt *stmt;
sqlite3_open([PATH UTF8String], &db);
// 方法一
/*
int res = sqlite3_prepare_v2(db, "update team set stu_name=(?),stu_password=(?),stu_login=(?) where stu_id=2" , -1, &stmt, nil);
sqlite3_bind_text(stmt, 1, "xiaoming", -1, nil);
sqlite3_bind_text(stmt, 2, "123456", -1, nil);
sqlite3_bind_text(stmt, 3, "xm", -1, nil);
*/
// 方法二
int rst=sqlite3_prepare_v2(db, "update team setstu_name='zl',stu_password='zl123',stu_login='zhangsan' where stu_id=4", -1, &stmt, nil);
// 判断是否修改成功
if (rst==SQLITE_OK) {
if (SQLITE_DONE == sqlite3_step(stmt)) {
NSLog(@" update ok");
}else{
NSLog(@"update fail");
}
}
}
-(void)deleteSql
{
sqlite3 *db;
sqlite3_stmt *stmt;
sqlite3_open([PATH UTF8String], &db);
int rst=sqlite3_prepare_v2(db, "delete from team where stu_id=9", -1, &stmt, nil);
// 判断是否删除成功
if (rst==SQLITE_OK) {
if (SQLITE_DONE==sqlite3_step(stmt)) {
NSLog(@" delete ok");
}else{
NSLog(@"delete fail");
}
}
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end
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