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README
Apache-2.0

MysqlOrm

Mysql数据库映射, ccoong/web_server 的扩展

依赖

1、ccoong/ccore
2、mysql-8.3.0-linux-glibc2.28-x86_64

基本信息配置文件

文件路径:./build/13535_mysqlorm.conf
//配置信息,示例:
"host": "主机","user": "用户名","password": "密码","port": "端口号","unix_socket": "连接方式","client_flag": "标志位","character":"字符集","read_timeout":"读取超时时间","write_timeout":"写入超时时间"
//多台服务器需换行,示例:
"host": "127.0.0.1","user": "root","password": "123456","port": "3306","unix_socket": "","client_flag": "0","character":"utf8mb4","read_timeout":"30","write_timeout":"60"

"host": "127.0.0.2","user": "root","password": "123456","port": "3306","unix_socket": "","client_flag": "0","character":"utf8mb4","read_timeout":"30","write_timeout":"60"

日志文件的路径

./build/13535.log

mode示例文件的路径

include/mysqlorm/mode/dbA1_test.hpp

mode文件说明

会根据创建的mode文件,自动生成相应的数据库与数据表(懒加载,只在调用mode文件时才会自动创建)

名称定义:通过下划线分割数据库与数据表,并且大小写敏感,如: dbA1_test 会生成对应的数据库 db_a1 与数据表 test

创建函数示例

    int createTableF_(){
        return createTable([this](auto *data){
            data->string_("name")->comment_("用户名");  //创建一个字符串类型的字段,字段的名字为 name,注解为 用户名
            data->int_("age")->nullable_()->comment_("年龄"); //同上,整型字段,允许值为null
            data->dateAt_(); //生成 created_at 表示创建时间,与 created_at 表示修改时间,它们的值将在创建与修改的时候自动更改
        });
    }

创建函数时的参数说明:

整型数据:

第一个参数为字段名,第二个参数可指定显示长度(zerofill_()表示空位补零)

tinyint_("name") //很小的整数(1字节,-128〜127 | 0〜255)
smallint_("name") //小的整数(2字节,-32768〜32767 | 0〜65535)
mediumint_("name") //中等大小的整数(3字节,-8388608〜8388607 | 0〜16777215)
int_("name") //普通大小的整数(4字节,-2147483648〜2147483647 | 0〜4294967295)
bigint_("name") //大整数(8字节,-9223372036854775808〜9223372036854775807 | 0〜18446744073709551615)
示例:tinyint_("name",2)->zerofill_() //表示字段名称为name,并指定了固定显示长度为2(如果插入的数据是1,指定长度2,结果就是01,指定长度3结果就是001)
浮点型数据:

第一个参数为字段名,第二个参数可指定显示长度,第三个参数可指定显示小数位数

float_("name") //单精度浮点数(4字节,±131072(65536×2))
double_("name") //双精度浮点数(8字节)
decimal_("name") //定点型浮点数(不存在精度损失)
字符串型数据:

第一个参数为字段名,第二个参数可指定字符串长度,如:string_("name",10) 字段名称为name,字符串长度为10个

string_("name") //字符串型
text_("name") //文本类型
date_("name") //时间类型
dateAt_("name") //会增加两个字段 创建时间(created_at) 与 修改时间(created_at),它们的值将在创建与修改的时候自动更改
其它后缀:
unsigned_(); //无符号的
unique_(); //唯一的
nullable_(); //允许值为null
default_("value"); //默认值
zerofill_(); //填充0固定长度:123=0000000123
comment_("words"); //注解

常用的函数说明

插入数据:

int insertF(const std::string value)

参数: value 要被插入的数据,值用逗号分隔、组用分号分隔、字符串需单引号包裹
返回值:成功返回0,失败返回-1

dbA1_test::obj().insertF("'小明',20,1"); //表示第一个字段的值为'小明',第二个字段为20,第三个字段为1(可以为null的字段如果没有内容也可以留空,如:dbA1_test::obj().insertF("'小明',,1"); 表示第一个字段的值为'小明',第二个字段为null,第三个字段为1)

where条件:

dql *where(const std::string &v)

说明: <小于,>大于,=等于,<=小于等于,>=大于等于,!=不等于,&&表示与,|| 表示或
其它: where后面还可以拼接其它条件,如:where表示and,orWhere表示or,notWhere用于值为null的正确获取
返回值:dql指针

std::string data{}; //创建一个字符串存放数据
dbA1_test::obj().where("age=20")->get(data); //查询 age=20 的所有数据,存放到 ata 字符串

修改数据:

int update(const std::string &data)

参数: data 要修改的数据,用单引号包裹字符串,用冒号分隔键值对 如:(name:'小明')、用逗号分隔段 如:(age:21,sex:0)
返回值:成功返回0,失败返回-1

dbA1_test::obj().where("age>20")->update("age:21,sex:0");

删除数据:

int del()

返回值:成功返回0,失败返回-1

获取指定字段的内容:

dql select(const std::string &key = "")

参数: key 只获取被指定的一个字段的内容(默认值"*"表示所有字段的内容)
返回值:dql指针

dql *selectArr(const std::vectorstd::string &key)

参数: key 只获取被指定的一组字段的内容
返回值:dql指针

以id获取内容:

dql *find(const unsigned long &id = 1)

参数: id
返回值:dql指针

排序方式:

dql *order(const std::string &key, const std::string &type = "ASC")

参数key:用于排序的字段名(如:id)
参数type:ASC表示升序,DESC为降序
返回值:dql指针

区间查询,包含边界值:

dql *between(const std::string &key, const unsigned long &start_value, const unsigned long &end_value)

参数key:字段名(以该字段进行查找)
参数start_value:开始值
参数end_value:结束值
说明: 查询指定key下的内容,start_value到end_value之间的数据,包含边界值
返回值:dql指针

获取值为null的数据:

dql *isNull(const std::string &key)

参数key:字段名(以该字段进行查找)
说明: 查询指定key下的内容为null的数据
返回值:dql指针

获取值不为null的数据:

dql *isNotNull(const std::string &key)

参数key:字段名(以该字段进行查找)
说明: 查询指定key下的内容不为null的数据
返回值:dql指针

like查找:

dql *like(const std::string &key, const std::string &value)

说明: %(匹配任意多个字符) _(匹配单一字符) (转义)

查看获取到的数据:

int show()

查看索引:

int showIndex()

用于查看执行了多少次:

int explain()

获取数据:

int get(std::string &result)

参数: result 查询到的结果

翻页:

上一页:

int limitLast(std::string &result,const unsigned &start_id,const unsigned &length = 100)

参数result:查询到的结果
参数start_id:小于该id的数据
参数length:每页显示多少条数据,默认100条
返回值:失败返回-1,成功返回0

std::string str_data{};
dbA1_test::obj().select("id")->limitLast(str_data,100);
std::cout<<str_data<<std::endl;

下一页:

int limitNext(std::string &result,const unsigned &end_id,const unsigned &length = 100)

参数result:查询到的结果
参数end_id:大于该id的数据
参数length:每页显示多少条数据,默认100条
返回值:失败返回-1,成功返回0

std::string str_data{};
dbA1_test::obj().select("id")->limitNext(str_data,1);
std::cout<<str_data<<std::endl;

特定页:

int limitSpecific(std::string &result,const unsigned &page = 1,const unsigned &length = 100)

参数result:查询到的结果
参数page:要查看第几页
参数length:每页显示多少条数据,默认100条
返回值:失败返回-1,成功返回0

std::string str_data{};
dbA1_test::obj().select("id")->limitSpecific(str_data,1);
std::cout<<str_data<<std::endl;

mode使用

插入数据

dbA1_test::obj().insertF("'小明',10");

说明:插入,name字段的值为小明(字符串要用单引号包裹),age字段的值为10,第三个字段sex没有值将默认为null

dbA1_test::obj().insertF("'小强',10,1;'大强',20,1");

说明:用分号(;)区分组,这里是两组数据分别为:小强年龄10性别1 与 大强年龄20性别为1

查看

dbA1_test::obj().find(1)->show();

说明:寻找id等于1的数据,show()表示打印出来

dbA1_test::obj().where("age>10 && sex=1");

说明:where表示查找(年龄大于10 并且 性别等于1)的数据

dbA1_test::obj().where("age>10")->where("sex=1");

说明:同上

dbA1_test::obj().where("age>10 || sex=1");

说明:查找(年龄大于10 或者 性别等于1)的数据

dbA1_test::obj().where("age>10")->orWhere("sex=1");

说明:同上

dbA1_test::obj().select("a1")->where("age>10");

说明:查找(年龄大于10)的数据,只要a1字段的内容

dbA1_test::obj().selectArr({"a1", "a2"})->where("age>10");

说明:查找(年龄大于10)的数据,只要a1与a2字段的内容

获取

std::string data{};
dbA1_test::obj().where("age=10")->get(data);

说明:data为获取到的数据(json字符串类型,可以直接返回给前端)

修改

dbA1_test::obj().where("age>10")->update("name:'大明',age:20");

说明:查找(年龄大于10)的数据,update表示更改(名称改为大明,年龄改成20)

删除

dbA1_test::obj().where("age=21")->del();

说明:查找where(年龄age等于21)的数据,删除del()

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