Sqlite语句 增删改查

2023年9月8日 267次阅读 来源: 77dc5bafc543

SqlData.h

#import#import#import “ClassMessage.h”

#import <>

@interface SqlData : NSObject

{

sqlite3 *db;

}

//单例方法

+(instancetype)initData;

//初始化数据库

-(void)initSql;

//初始化数据库表格

-(void)initTable;

//添加数据

-(void)AddData:(ClassMessage *)data;

//修改数据

-(void)upData:(ClassMessage *)data;

//删除数据

-(void)deletaData:(NSInteger)theId;

//查询数据

-(NSMutableArray *)showData;

//关闭数据

-(void)closeSql;

@end

SqlData.m

#import “SqlData.h”

//创建静态变量

static SqlData *sqlData;

@implementation SqlData

//单例方法

+(instancetype)initData

{

if (!sqlData) {

sqlData = [[SqlData alloc]init];

}

return sqlData;

}

//初始化数据库

-(void)initSql

{

//Documents 目录 （路径）

NSString *str = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)objectAtIndex:0];

//拼接

NSString *strName = [str stringByAppendingString:@”/1511E.db”];

//打开数据库

if (sqlite3_open([strName UTF8String], &db) == SQLITE_OK) {

NSLog(@”数据库打开成功”);

[self initTable];

}else

{

NSLog(@”数据库打开失败”);

}

}

//初始化数据库表格

-(void)initTable

{

//sql 语句

//初始化数据库表格的格式：create table if not exists  表名（主键id integer primary key，所有的数据类型);

// const char *sql = “create table if not exists ClassMessage(classid integer primary key,name text,age text,sex text,heigt text,weitht text)”;

//*name,*age,*sex,*heigt,*weitht;

const char *sql = “create table if not exists ClassMessage(classid integer primary key,name text,age text,sex text,heigt text,weitht text)”;

//预编译数据库的指针

sqlite3_stmt *stmt;

//绑定数据库指针的一个接口  -1 自动匹配长度

sqlite3_prepare_v2(db, sql, -1, &stmt, nil);

//执行预编译接口

//一行一行的去判断是否执行完成

if (sqlite3_step(stmt) == SQLITE_DONE) {

NSLog(@”数据库表格创建成功”);

}else

{

NSLog(@”数据框表格创建失败”);

}

//销毁接口

sqlite3_finalize(stmt);

}

//添加数据

-(void)AddData:(ClassMessage *)data

{

//添加数据的sql语句: insert into 表明 values(null,?,?,?,?,?);

//    const char *sql = “insert into ClassMessage values(null,?,?,?,?,?)”;

const char *sql = “insert into ClassMessage values(null,?,?,?,?,?)”;

//预编译数据库的指针

sqlite3_stmt *stmt;

//绑定数据库指针的一个接口  -1 自动匹配长度

sqlite3_prepare_v2(db, sql, -1, &stmt, nil);

//添加数据库的接口

//绑定数据库接口

sqlite3_bind_text(stmt, 1, [data.name UTF8String], -1 , SQLITE_TRANSIENT);

sqlite3_bind_text(stmt, 2, [data.age UTF8String], -1 , SQLITE_TRANSIENT);

sqlite3_bind_text(stmt, 3, [data.sex UTF8String], -1 , SQLITE_TRANSIENT);

sqlite3_bind_text(stmt, 4, [data.heigt UTF8String], -1 , SQLITE_TRANSIENT);

sqlite3_bind_text(stmt, 5, [data.weitht UTF8String], -1 , SQLITE_TRANSIENT);

//执行预编译接口 sqlite3_step(stmt);

sqlite3_step(stmt);

//销毁接口

sqlite3_finalize(stmt);

}

//修改数据

-(void)upData:(ClassMessage *)data

{

//sql 语句的格式：update 表名 set 所有数据 where 主键 = ？

const char *sql = “update ClassMessage set name = ?,age = ?,sex = ?,heigt = ?,weitht = ? where classid = ?”;

//预编译指针 (链接到数据库)

sqlite3_stmt *stmt;

//绑定数据库指针的接口

sqlite3_prepare_v2(db, sql, -1, &stmt, nil);

//添加数据库的接口

//绑定数据库接口

sqlite3_bind_text(stmt, 1, [data.name UTF8String], -1 , SQLITE_TRANSIENT);

sqlite3_bind_text(stmt, 2, [data.age UTF8String], -1 , SQLITE_TRANSIENT);

sqlite3_bind_text(stmt, 3, [data.sex UTF8String], -1 , SQLITE_TRANSIENT);

sqlite3_bind_text(stmt, 4, [data.heigt UTF8String], -1 , SQLITE_TRANSIENT);

sqlite3_bind_text(stmt, 5, [data.weitht UTF8String], -1 , SQLITE_TRANSIENT);

//绑定主键 id

sqlite3_bind_int(stmt, 6,(int)(data.classid));

//执行预编译接口 sqlite3_step(stmt);

sqlite3_step(stmt);

//销毁接口

sqlite3_finalize(stmt);

}

//删除数据

-(void)deletaData:(NSInteger)theId

{

//sql 语句： delete from 表名 where 表明的主键 id = ?

const char *sql = “delete from ClassMessage where classid = ?”;

//预编译指针 (链接到数据库)

sqlite3_stmt *stmt;

//绑定数据库指针的接口

sqlite3_prepare_v2(db, sql, -1, &stmt, nil);

//删除绑定主键 id

sqlite3_bind_int(stmt, 1, (int)theId);

//执行预编译接口 sqlite3_step(stmt);

sqlite3_step(stmt);

//销毁接口

sqlite3_finalize(stmt);

}

//查询数据

-(NSMutableArray *)showData

{

//sql 语句格式 ：select *from 表名

// const char *sql = “select *from ClassMessage”;

const char *sql = “select *from ClassMessage”;

//预编译指针 (链接到数据库)

sqlite3_stmt *stmt;

//绑定数据库指针的接口

sqlite3_prepare_v2(db, sql, -1, &stmt, nil);

NSMutableArray *arr = [NSMutableArray array];

//执行数据库中的预编译接口

//SQLITE_ROW一行一行的去查询数据库中的数据

while (sqlite3_step(stmt) == SQLITE_ROW) {

ClassMessage *classData = [[ClassMessage alloc]init];

//找到表格中的主键

//sqlite3_column_xxx 标识返回当前的行（指的是列的数据）

classData.classid = sqlite3_column_int(stmt, 0);

classData.name = [NSString stringWithUTF8String:(const char *) sqlite3_column_text(stmt, 1)];

classData.age = [NSString stringWithUTF8String:(const char *) sqlite3_column_text(stmt, 2)];

classData.sex = [NSString stringWithUTF8String:(const char *) sqlite3_column_text(stmt, 3)];

classData.heigt = [NSString stringWithUTF8String:(const char *) sqlite3_column_text(stmt, 4)];

classData.weitht = [NSString stringWithUTF8String:(const char *) sqlite3_column_text(stmt, 5)];

[arr addObject:classData];

}

//销毁接口

sqlite3_finalize(stmt);

return arr;

}

//关闭数据

-(void)closeSql

{

sqlite3_close(db);

}

@end

ClassMessage.h

#import@interface ClassMessage : NSObject

//唯一标识 数据库必须得有一个主键

@property(nonatomic,assign)NSInteger classid;

@property(nonatomic,strong) NSString *name,*age,*sex,*heigt,*weitht;

@end

ClassView.h

#import@interface ClassView : UIView

@property(nonatomic,strong) UITextField *nameTf,*ageTf,*sexTf,*heightTf,*weightTf;

@end

ClassView.m

#import “ClassView.h”

@implementation ClassView

-(instancetype)initWithFrame:(CGRect)frame

{

if (self = [super initWithFrame:frame]) {

[self addSubview:self.nameTf];

[self addSubview:self.ageTf];

[self addSubview:self.sexTf];

[self addSubview:self.heightTf];

[self addSubview:self.weightTf];

}

return self;

}

//懒加载

-(UITextField *)nameTf

{

if (!_nameTf) {

_nameTf = [[UITextField alloc]initWithFrame:CGRectMake(0, 80, self.frame.size.width, 50)];

_nameTf.borderStyle = UITextBorderStyleRoundedRect;

_nameTf.placeholder = @”姓名”;

_nameTf.textColor = [UIColor lightGrayColor];

_nameTf.textAlignment = NSTextAlignmentCenter;

}

return _nameTf;

}

-(UITextField *)ageTf

{

if (!_ageTf) {

_ageTf = [[UITextField alloc]initWithFrame:CGRectMake(0, 140, self.frame.size.width, 50)];

_ageTf.borderStyle = UITextBorderStyleRoundedRect;

_ageTf.placeholder = @”年龄”;

_ageTf.textColor = [UIColor lightGrayColor];

_ageTf.textAlignment = NSTextAlignmentCenter;

}

return _ageTf;

}

-(UITextField *)sexTf

{

if (!_sexTf) {

_sexTf = [[UITextField alloc]initWithFrame:CGRectMake(0, 200, self.frame.size.width, 50)];

_sexTf.borderStyle = UITextBorderStyleRoundedRect;

_sexTf.placeholder = @”性别”;

_sexTf.textColor = [UIColor lightGrayColor];

_sexTf.textAlignment = NSTextAlignmentCenter;

}

return _sexTf;

}

-(UITextField *)heightTf

{

if (!_heightTf) {

_heightTf = [[UITextField alloc]initWithFrame:CGRectMake(0, 260, self.frame.size.width, 50)];

_heightTf.borderStyle = UITextBorderStyleRoundedRect;

_heightTf.placeholder = @”身高”;

_heightTf.textColor = [UIColor lightGrayColor];

_heightTf.textAlignment = NSTextAlignmentCenter;

}

return _heightTf;

}

-(UITextField *)weightTf

{

if (!_weightTf) {

_weightTf = [[UITextField alloc]initWithFrame:CGRectMake(0, 320, self.frame.size.width, 50)];

_weightTf.borderStyle = UITextBorderStyleRoundedRect;

_weightTf.placeholder = @”体重”;

_weightTf.textColor = [UIColor lightGrayColor];

_weightTf.textAlignment = NSTextAlignmentCenter;

}

return _weightTf;

}

@end

ViewController.m

#import “ViewController.h”

#import “SqlData.h”

#import “ClassMessage.h”

#import “sectionViewController.h”

@interface ViewController ()

{

NSMutableArray *array;

}

@end

@implementation ViewController

– (void)viewDidLoad {

[super viewDidLoad];

//    //1.先调用类方法 2.通过类方法 3.调用实例方法

//    [[SqlData initData]initSql];

//标题

self.title = @”数据库”;

//初始化

array = [NSMutableArray array];

self.tableView.rowHeight = 150;

//导航右按钮

self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemAdd target:self action:@selector(click)];

}

//按钮点击事件跳转

-(void)click

{

sectionViewController *section = [[sectionViewController alloc]init];

[self.navigationController pushViewController:section animated:YES];

}

//视图将要显示

-(void)viewWillAppear:(BOOL)animated

{

//调用数据库单例方法

[[SqlData initData]initSql];

//调用数据库查询方法

array = [[SqlData initData]showData];

//关闭数据方法

[[SqlData initData]closeSql];

//刷新表格

[self.tableView reloadData];

}

#pragma mark –

#pragma mark UITableViewDataSource

//表格行数

-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section

{

return array.count;

}

//表格内容

-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath

{

UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@””];

if (!cell) {

cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@””];

}

ClassMessage *classmsg = array[indexPath.row];

cell.textLabel.text = [NSString stringWithFormat:@”%ld\n%@\n%@\n%@\n%@\n%@”,classmsg.classid,classmsg.name,classmsg.age,classmsg.sex,classmsg.heigt,classmsg.weitht];

cell.textLabel.numberOfLines = 0;

return cell;

}

-(void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath

{

//调用数据库

[[SqlData initData]initSql];

//是删除主键ID 获取数据库中的数据

[[SqlData initData]deletaData:[array[indexPath.row]classid]];

//关闭数据库

[[SqlData initData]closeSql];

//删除数据

[array removeObject:array[indexPath.row]];

//刷新表格

[self.tableView reloadData];

}

//代理方法

-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath

{

sectionViewController *secVc = [sectionViewController new];

//属性传值

secVc.msg = array[indexPath.row];

[self.navigationController pushViewController:secVc animated:YES];

}

@end

sectionViewController.h

#import#import “ClassMessage.h”

@interface sectionViewController : UIViewController

@property(nonatomic,strong)ClassMessage *msg;

@end

sectionViewController.m

#import “sectionViewController.h”

#import “ClassView.h”

#import “ClassMessage.h”

#import “SqlData.h”

@interface sectionViewController ()

{

ClassView *theview;

}

@end

@implementation sectionViewController

– (void)viewDidLoad {

[super viewDidLoad];

theview = [[ClassView alloc]initWithFrame:self.view.frame];

theview.backgroundColor = [UIColor blackColor];

self.view = theview;

theview.nameTf.text = self.msg.name;

theview.ageTf.text = self.msg.age;

theview.sexTf.text = self.msg.sex;

theview.heightTf.text = self.msg.heigt;

theview.weightTf.text = self.msg.weitht;

//标题

if (theview.nameTf.text.length <=0) {

self.title = @”添加数据”;

self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemSave target:self action:@selector(save)];

}else

{

self.title = @”修改数据”;

self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemEdit target:self action:@selector(Edit)];

}

}

-(void)save

{

ClassMessage *message = [ClassMessage new];

message.name =  theview.nameTf.text;

message.age =  theview.ageTf.text;

message.sex =  theview.sexTf.text;

message.heigt =  theview.heightTf.text;

message.weitht =  theview.weightTf.text;

//调用数据库方法

[[SqlData initData]initSql];

//调用添加数据库方法

[[SqlData initData]AddData:message];

//调用关闭数据库方法

[[SqlData initData]closeSql];

//跳转到上一试图

[self.navigationController popViewControllerAnimated:YES];

}

-(void)Edit

{

self.msg.name =  theview.nameTf.text;

self.msg.age =  theview.ageTf.text;

self.msg.sex =  theview.sexTf.text;

self.msg.heigt =  theview.heightTf.text;

self.msg.weitht =  theview.weightTf.text;

//调用数据库方法

[[SqlData initData]initSql];

[[SqlData initData]upData:self.msg];

[[SqlData initData]closeSql];

//跳转到上一试图

[self.navigationController popViewControllerAnimated:YES];

}

@end

    原文作者：77dc5bafc543
    原文地址: https://www.jianshu.com/p/563456fbc1b7
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