#pragma once
#include <functional>
#include <string>

class MySQLResult
{
public:
    MySQLResult();
    ~MySQLResult();

    /// 获取数据表的表头数量和结果行数
    unsigned int getNumFields();
    uint64_t getNumRows();

    /// 获取数据表的表头名称
    char* getFieldName(int Index);

    /// 对于每行数据执行func
    void stepRow(const std::function<void(char** RowPtr,unsigned long* FieldLength)>& func);

private:
    struct impl;
    impl* pimpl;

    friend class MySQLConn;
};

class MySQLConn
{
public:
    MySQLConn();
    ~MySQLConn();

    /// 数据库连接
    int connect(const char* host,const char* user,const char* passwd,const char* db,unsigned int port);

    /// 执行SQL语句
    int exec(const std::string& SQLCommand,const std::function<void(MySQLResult&)>& res);

    /// 获取错误信息
    const char* getError();

    /// 当结果为空时用于判断数据库运行正常与否
    unsigned int getFieldCount();
    uint64_t getAffectedRows();
private:
    struct impl;
    impl* pimpl;
};