//
//  SQLiteManager.m
//  SQLite数据库操作-0C
//
//  Created by 邱学伟 on 16/10/24.
//  Copyright © 2016年 邱学伟. All rights reserved.
//

#import "SQLiteManager.h"
#import <sqlite3.h>

@interface SQLiteManager ()
@property (nonatomic,assign) sqlite3 *db;
@end


@implementation SQLiteManager
static SQLiteManager *instance;
+(instancetype)shareInstance{
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        instance = [[self alloc] init];
    });
    return instance;
}
#pragma mark - 打开/创建数据库
-(BOOL)openDB{
    //app内数据库文件存放路径-一般存放在沙盒中
    NSString *documentPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
    NSString *DBPath = [documentPath stringByAppendingPathComponent:@"appDB.sqlite"];
    //创建(指定路径不存在数据库文件)/打开(已存在数据库文件) 数据库文件
    //sqlite3_open(<#const char *filename#>, <#sqlite3 **ppDb#>)  filename:数据库路径  ppDb:数据库对象
    if (sqlite3_open(DBPath.UTF8String, &_db) != SQLITE_OK) {
        //数据库打开失败
        return NO;
    }else{
        //打开成功创建表
        return [self creatTable];
    }
}

-(void)closeDB{
    sqlite3_close(_db);
}
-(BOOL)creatTable{
    //创建表的SQL语句
    //用户 表
    NSString *serviceNoticeTable = @"CREATE TABLE IF NOT EXISTS 'T_Service_Notice' ('ServiceNoticeID' INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,'Content' TEXT,'Time' DATETIME,'ReadFlag' TEXT);";

     NSString *messageNoticeTable = @"CREATE TABLE IF NOT EXISTS 'T_Message_Notice' ( 'MessageNoticeID' INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,'NoticeId' INTEGER,'Title' TEXT,'Content' TEXT,'NoticeType' TEXT,'NoticeTypeName' Text,'Remarks'TEXT,'CreateTime' DATETIME,'ReadFlag' TEXT);";
    
    NSArray *SQL_ARR = [NSArray arrayWithObjects:serviceNoticeTable,messageNoticeTable, nil];
    return [self creatTableExecSQL:SQL_ARR];
}
-(BOOL)creatTableExecSQL:(NSArray *)SQL_ARR{
    for (NSString *SQL in SQL_ARR) {
        //参数一:数据库对象  参数二:需要执行的SQL语句  其余参数不需要处理
        if (![self execSQL:SQL]) {
            return NO;
        }
    }
    return YES;
}
#pragma 执行SQL语句
-(BOOL)execSQL:(NSString *)SQL{
    char *error;
    if (sqlite3_exec(self.db, SQL.UTF8String, nil, nil, &error) == SQLITE_OK) {
           NSLog(@"插入数据成功");
      
        return YES;
    }else{
        NSLog(@"SQLiteManager执行SQL语句出错:%s",error);
        return NO;
    }
}
#pragma mark - 查询数据库中数据
-(NSArray *)querySQL:(NSString *)SQL{
    //准备查询
    // 1> 参数一:数据库对象
    // 2> 参数二:查询语句
    // 3> 参数三:查询语句的长度:-1
    // 4> 参数四:句柄(游标对象)
//    sqlite3_prepare_v2(<#sqlite3 *db#>, <#const char *zSql#>, <#int nByte#>, <#sqlite3_stmt **ppStmt#>, <#const char **pzTail#>)
    sqlite3_stmt *stmt = nil;
    if (sqlite3_prepare_v2(self.db, SQL.UTF8String, -1, &stmt, nil) != SQLITE_OK) {
        NSLog(@"准备查询失败!");
        return NULL;
    }
    //准备成功,开始查询数据
    //定义一个存放数据字典的可变数组
    NSMutableArray *dictArrM = [[NSMutableArray alloc] init];
    while (sqlite3_step(stmt) == SQLITE_ROW) {
        //一共获取表中所有列数(字段数)
        int columnCount = sqlite3_column_count(stmt);
        //定义存放字段数据的字典
        NSMutableDictionary *dict = [[NSMutableDictionary alloc] init];
        for (int i = 0; i < columnCount; i++) {
            // 取出i位置列的字段名,作为字典的键key
            const char *cKey = sqlite3_column_name(stmt, i);
            NSString *key = [NSString stringWithUTF8String:cKey];
            
            //取出i位置存储的值,作为字典的值value
            const char *cValue = (const char *)sqlite3_column_text(stmt, i);
            NSString *value = [NSString stringWithUTF8String:cValue];
            
            //将此行数据 中此字段中key和value包装成 字典
            [dict setObject:value forKey:key];
        }
        [dictArrM addObject:dict];
    }
    return dictArrM;
}
@end