// ViewController.m
// sqlite3
//
// Created by 周玉 on 2017/12/13.
// Copyright © 2017年 guidekj. All rights reserved.
//
#import "ViewController.h"
#import <sqlite3.h>
#define KUIScreenWidth [UIScreen mainScreen].bounds.size.width
#define KUIScreenHeight [UIScreen mainScreen].bounds.size.height
#define FILE_NAME @"saas.sqlite"
static sqlite3 *db = nil;
@interface ViewController ()
@end

@implementation ViewController

- (void)viewDidLoad {
  [super viewDidLoad];
  self.title = @"sqlite3";

  //DDB
//  [self openDB];
//  [self closeDB];

  //DDL
//  [self createTable];
//  [self dropTable];

  //DML
//  [self insertData];
//  [self updateData];
//  [self deleteData];

  //DQL
  [self queryData];
}

#pragma mark 查詢
- (void)queryData{
  sqlite3 *newDB = [self openDB];
  sqlite3_stmt *statement = nil;
  NSString *sqlStr = @"SELECT * FROM SAAS_PERSON";
  int result = sqlite3_prepare_v2(newDB, sqlStr.UTF8String, -1, &statement, NULL);
  if (result == SQLITE_OK) {
    //遍歷查詢結(jié)果
    if (!(sqlite3_step(statement) == SQLITE_DONE)) {
      while (sqlite3_step(statement) == SQLITE_ROW) {
        int ID = sqlite3_column_int(statement, 0);
        const unsigned char *name = sqlite3_column_text(statement, 1);
        const unsigned char *sex = sqlite3_column_text(statement, 2);
        int age = sqlite3_column_int(statement, 3);
        const unsigned char *description = sqlite3_column_text(statement, 4);
        NSLog(@"ID = %d , name = %@ , sex = %@ , age = %d , description = %@",ID,[NSString stringWithUTF8String:(const char *)name],[NSString stringWithUTF8String:(const char *)sex],age,[NSString stringWithUTF8String:(const char *)description]);
      }
    } else {
      NSLog(@"查詢語句完成");
    }
  } else {
    NSLog(@"查詢語句不合法");
  }
  sqlite3_finalize(statement);
  [self closeDB];
}

#pragma mark 刪除數(shù)據(jù)記錄
- (void)deleteData{
  sqlite3 *newDB = [self openDB];
  sqlite3_stmt *statement = nil;
  NSString *sqlStr = @"DELETE FROM SAAS_PERSON WHERE NAME = '王鵬飛'";
  int result = sqlite3_prepare_v2(newDB, sqlStr.UTF8String, -1, &statement, NULL);
  if (result == SQLITE_OK) {
    if (sqlite3_step(statement) == SQLITE_DONE) {
      NSLog(@"刪除操作完成");
    }
  } else {
    NSLog(@"刪除操作不合法");
  }
  sqlite3_finalize(statement);
  [self closeDB];
}

#pragma mark 更新數(shù)據(jù)記錄
- (void)updateData{
  sqlite3 *newDB = [self openDB];
  sqlite3_stmt *statement = nil;
  NSString *sqlStr = @"UPDATE SAAS_PERSON SET DESCRIPTION = '喜歡運動,旅游' WHERE NAME = '周玉'";
  int result = sqlite3_prepare_v2(newDB, sqlStr.UTF8String, -1, &statement, NULL);
  if (result == SQLITE_OK) {
    if (sqlite3_step(statement) == SQLITE_DONE) {
      NSLog(@"更新信息完成");
    }
  } else {
    //[logging] no such column: DESCRIPT (KEY拼寫錯誤) --- 更新信息不合法
    NSLog(@"更新信息不合法");
  }
  sqlite3_finalize(statement);
  [self closeDB];
}

#pragma mark 新增數(shù)據(jù)記錄
- (void)insertData{
  sqlite3 *newDB = [self openDB];
  sqlite3_stmt *statement = nil;
//  NSString *sqlStr = @"INSERT INTO SAAS_PERSON (NAME , SEX , AGE , DESCRIPTION) VALUES('周玉','男',28,'開朗樂觀')";
//  NSString *sqlStr = @"INSERT INTO SAAS_PERSON (NAME , SEX , AGE , DESCRIPTION) VALUES('王鵬飛','女',27,'開朗樂觀')";
//  NSString *sqlStr = @"INSERT INTO SAAS_PERSON (NAME , SEX , AGE , DESCRIPTION) VALUES('李梅','女',20,'年輕可愛��')";
  NSString *sqlStr = @"INSERT INTO SAAS_PERSON (NAME , SEX , AGE , DESCRIPTION) VALUES('sumit','男',15,'小朋友的年紀')";
  //檢驗合法性
  int result = sqlite3_prepare_v2(newDB, sqlStr.UTF8String, -1, &statement, NULL);
  if (result == SQLITE_OK) {
    //判斷語句執(zhí)行完畢
    if (sqlite3_step(statement) == SQLITE_DONE) {
      NSLog(@"插入的信息完成");
    }
  } else {
    NSLog(@"插入的信息不合法");
  }
  sqlite3_finalize(statement);
  [self closeDB];
}

#pragma mark 創(chuàng)建表
- (void)createTable{
  sqlite3 *newDB = [self openDB];
  //  char *sql = "CREATE TABLE IF NOT EXISTS t_person (ID INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, NAME TEXT , SEX TEXT,AGE INTEGER,DESCRIPTION TEXT);";
  NSString *sqlStr = @"CREATE TABLE IF NOT EXISTS SAAS_PERSON (ID INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, NAME TEXT , SEX TEXT,AGE INTEGER,DESCRIPTION TEXT);";
  char *error = NULL;

  int result = sqlite3_exec(newDB, sqlStr.UTF8String, NULL, NULL, &error);
  if (result == SQLITE_OK) {
    NSLog(@"創(chuàng)建表成功");
  } else {
    NSLog(@"創(chuàng)建表失敗 = %s",error);
  }
  [self closeDB];
}

#pragma mark 刪除表
- (void)dropTable{
  sqlite3 *newDB = [self openDB];
  NSString *sqlStr = @"DROP TABLE t_person";
  char *error = NULL;
  int result = sqlite3_exec(newDB, sqlStr.UTF8String, NULL, NULL, &error);
  if (result == SQLITE_OK) {
    NSLog(@"刪除表成功");
  } else {
    NSLog(@"刪除表失敗 = %s",error);
  }
  [self closeDB];
}

#pragma mark 打開或者創(chuàng)建數(shù)據(jù)庫
- (sqlite3 *)openDB {
  if (!db) {
    //1.獲取document文件夾的路徑
    //參數(shù)1:文件夾的名字 參數(shù)2:查找域 參數(shù)3:是否使用絕對路徑
    NSString *documentPath = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)[0];
    //獲取數(shù)據(jù)庫文件的路徑
    NSString *dbPath = [documentPath stringByAppendingPathComponent:@"saas.sqlite"];
    NSLog(@"%@",dbPath);
    //判斷document中是否有sqlite文件
    int result = sqlite3_open([dbPath UTF8String], &db);
    if (result == SQLITE_OK) {
      NSLog(@"打開數(shù)據(jù)庫");

    }else{
      [self closeDB];
      NSLog(@"打開數(shù)據(jù)庫失敗");
    }
  }
  return db;
}

#pragma mark 關(guān)閉數(shù)據(jù)庫
- (void)closeDB{
  int result = sqlite3_close(db);
  if (result == SQLITE_OK) {
    NSLog(@"數(shù)據(jù)庫關(guān)閉成功");
    db = nil;
  } else {
    NSLog(@"數(shù)據(jù)庫關(guān)閉失敗");
  }
}
@end