//
// ViewController.m
// test_sqlite
//
// Created by 郑玉洋 on 2017/4/13.
// Copyright © 2017年郑玉洋. All rights reserved.
//
#import "ViewController.h"
@interface ViewController ()
@end
@implementation ViewController
- (void)addSql:(id)sender{
//为了测试这里利用随机数与for循环进行多次插入不同数据
for (NSInteger i =0; i <10; i++) {
NSString * sql = [NSStringstringWithFormat:@"insert into t_text ('%@') values ('%@');",@"name", [NSStringstringWithFormat:@"测试--%zd",arc4random_uniform(99) ]];
char * errmsg;
sqlite3_exec(db, sql.UTF8String,NULL, NULL, &errmsg);
if (errmsg) {
NSLog(@"插入失败--%s",errmsg);
}else{
NSLog(@"插入成功");
}
}
}
- (void)delSql:(id)sender{
//这里删除随机id大于3 小于6的
//操作代码(sql)
NSString * sql =@"delete from t_text where id > 3 and id <6;";
char * errmsg;
sqlite3_exec(db, sql.UTF8String,NULL, NULL, &errmsg);
if (errmsg) {
NSLog(@"删除失败--%s",errmsg);
}else{
NSLog(@"删除成功");
}
}
- (void)updateSql:(id)sender{
//这里吧id为9的 name更改为 hello-world
//操作代码(sql)
NSString * sql =@"update t_text set name = 'hello-world' where id = 9;";
char * errmsg;
sqlite3_exec(db, sql.UTF8String,NULL, NULL, &errmsg);
if (errmsg) {
NSLog(@"修改失败--%s",errmsg);
}else{
NSLog(@"修改成功");
}
}
- (void)selectSql:(id)sender{
//查询所有信息
//操作代码(sql)
NSString * sql =@"select * from t_text;";
//查询的句柄,游标
sqlite3_stmt * stmt;
if (sqlite3_prepare(db, sql.UTF8String, -1, &stmt, NULL) ==SQLITE_OK) {
//查询数据
while (sqlite3_step(stmt) ==SQLITE_ROW) {
//获取表数据的内容
//sqlite3_column_text('句柄',字段索引值)
NSString * name = [NSStringstringWithCString:(constchar *)sqlite3_column_text(stmt,1) encoding:NSUTF8StringEncoding];
NSLog(@"name = %@",name);
}
}
}
- (void)viewDidLoad {
[superviewDidLoad];
UIButton *addBtn = [[UIButtonalloc] initWithFrame:CGRectMake(100,100, 30,15)];
addBtn.backgroundColor = [UIColorblueColor];
[addBtn addTarget:selfaction:@selector(addSql:)forControlEvents:UIControlEventTouchUpInside];
[self.viewaddSubview:addBtn];
UIButton *delBtn = [[UIButtonalloc] initWithFrame:CGRectMake(100,200, 30,15)];
delBtn.backgroundColor = [UIColorblueColor];
[delBtn addTarget:selfaction:@selector(delSql:)forControlEvents:UIControlEventTouchUpInside];
[self.viewaddSubview:delBtn];
UIButton *updateBtn = [[UIButtonalloc] initWithFrame:CGRectMake(100,300, 30,15)];
updateBtn.backgroundColor = [UIColorblueColor];
[updateBtn addTarget:selfaction:@selector(updateSql:)forControlEvents:UIControlEventTouchUpInside];
[self.viewaddSubview:updateBtn];
UIButton *selectBtn = [[UIButtonalloc] initWithFrame:CGRectMake(100,600, 30,15)];
selectBtn.backgroundColor = [UIColorblueColor];
[selectBtn addTarget:selfaction:@selector(selectSql:)forControlEvents:UIControlEventTouchUpInside];
[self.viewaddSubview:selectBtn];
//设置数据库的路径
NSString *path = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES)firstObject];
NSString *fileName = [pathstringByAppendingPathComponent:@"text.sqlite"];
NSLog(@"fileName = %@",fileName);
//打开数据库如果没有打开的数据库就建立一个
//第一个参数是数据库的路径注意要转换为c的字符串
if (sqlite3_open(fileName.UTF8String, &db) == SQLITE_OK) {
NSLog(@"打开数据库成功");
//打开数据库成功后建立数据库内的表
//操作命令的字符串
//注意字符串的结束处有 ;号
NSString * sql =@"create table if not exists t_text (id integer primary key autoincrement,name text);";
char * errmsg;
sqlite3_exec(db, sql.UTF8String,NULL, NULL, &errmsg);
if (errmsg) {
NSLog(@"建表失败 -- %s",errmsg);
}else{
NSLog(@"建表成功");
}
}else{
NSLog(@"打开数据库失败");
}
}
@end