access_db 0.2.1

/// 新增数据 ，返回 sql 语句。
/// 下面示例中，user 为表名，，name、num 为字段名，，后面为新增的值。
/// Add new data, then return sql. exp: users table, field name and num. after them is value.
/// ```
/// let sql = mysetmany!("users", {
///     "name": string_t.clone(),
///     "num": 882,
/// });
/// 
/// 执行
/// myconn.run(sql);
/// ```
#[macro_export]
macro_rules! mysetmany {
    ($t:expr, [$({$($k:tt: $v:expr),+$(,)?}),+$(,)?]) => {
        {
            fn type_of<T>(_: T) -> &'static str {
                std::any::type_name::<T>()
            }
            let mut keys = String::from("");
            let mut values = String::from("");
            $(
                if keys == "".to_string() {
                    $(
                        keys = keys + $k + ",";
                    )+
                }
                values = values + " ( ";
                $(
                    let temp_v = $v.clone();
                    let v_type = type_of($v);
                    values = match v_type {
                        "&str" => {
                            let mut v_r = temp_v.to_string().as_str().replace("\\", "\\\\");
                            v_r = v_r.replace("\"", "\\\"");
                            values + "\"" + &v_r + "\","
                        },
                        "alloc::string::String" => {
                            let mut v_r = temp_v.to_string().as_str().replace("\\", "\\\\");
                            v_r = v_r.replace("\"", "\\\"");
                            values + "\"" + &v_r + "\","
                        },
                        _ => {
                            values + temp_v.to_string().as_str() + ","
                        }
                    };
                )+
                values.pop();
                values = values + " ),";
            )+
            
            keys.pop();
            values.pop();
    
            let sql: String = "INSERT INTO ".to_string() + $t + " ( " + keys.as_str() + " ) "
                + " VALUES " + values.as_str();
    
            sql
        }
    };
}