[英]Why I obtain this error when I try to create this funcion (that use point data type) on a MariaDB database?
I am not so into database and I have the following doubt implementing this tutorial: https://mariadb.org/jquery-and-gis-distance-in-mariadb/ 我不太喜欢数据库,在实现本教程时有以下疑问: https : //mariadb.org/jquery-and-gis-distance-in-mariadb/
So basically my doubt is relate to this SQL statment that create a function to calculate the distance between two point on a MariaDB database: 所以基本上我的疑问是涉及到创建一个函数来计算MariaDB的数据库上的两个点之间的距离,这样SQL statment:
CREATE FUNCTION earth_circle_distance(point1 point, point2 point) RETURNS double
DETERMINISTIC
begin
declare lon1, lon2 double;
declare lat1, lat2 double;
declare td double;
declare d_lat double;
declare d_lon double;
declare a, c, R double;
set lon1 = X(GeomFromText(AsText(point1)));
set lon2 = X(GeomFromText(AsText(point2)));
set lat1 = Y(GeomFromText(AsText(point1)));
set lat2 = Y(GeomFromText(AsText(point2)));
set d_lat = radians(lat2 - lat1);
set d_lon = radians(lon2 - lon1);
set lat1 = radians(lat1);
set lat2 = radians(lat2);
set R = 6372.8; -- in kilometers
set a = sin(d_lat / 2.0) * sin(d_lat / 2.0) + sin(d_lon / 2.0) * sin(d_lon / 2.0) * cos(lat1) * cos(lat2);
set c = 2 * asin(sqrt(a));
return R * c;
end
My problem is that performing the previous statment I obtain the following error message: 我的问题是,执行前一个语句会得到以下错误消息:
Error
----------------------------------------------------
Static analysis:
2 errors were found during analysis.
1. Unrecognized data type. (near "point" at position 45)
2. Unrecognized data type. (near "point" at position 59)
SQL query:
CREATE FUNCTION earth_circle_distance(point1 point, point2 point) RETURNS double DETERMINISTIC begin declare lon1, lon2 double
MySQL said:
#1064 - You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near '' at line 4
PhpMyAdmin sign with 2 red marker the point data type on the first line of the previous statment: 用2个红色标记标记的PhpMyAdmin符号在上一条语句的第一行上显示点数据类型:
CREATE FUNCTION earth_circle_distance(point1 point, point2 point) RETURNS double
but I don't think that it could be the real problem (I think that maybe is something that PhpMyAdmin don't know) because it mark red also this cration query: 但我不认为它可能是真正的问题(我想,也许是一些phpMyAdmin的不知道),因为它标志着红也是这个cration查询:
CREATE TABLE gis_point (g POINT);
but it works fine, give me no error and correctly create the table. 但它工作正常,没有错误,并正确创建了表。
So, whta is wrong? 那么,错了吗? Could depend by PhpMyAdmin or what am I missing? 可以依靠PhpMyAdmin还是我缺少什么? Where this function should be stored? 此功能应存储在哪里?
Change the delimiter. 更改定界符。 Otherwise the function definition ends at the first ;
否则,函数定义在第一个处结束;
which would make it incomplete. 这将使其不完整。
delimiter ||
CREATE FUNCTION earth_circle_distance(point1 point, point2 point) RETURNS double
DETERMINISTIC
begin
declare lon1, lon2 double;
declare lat1, lat2 double;
declare td double;
declare d_lat double;
declare d_lon double;
declare a, c, R double;
set lon1 = X(GeomFromText(AsText(point1)));
set lon2 = X(GeomFromText(AsText(point2)));
set lat1 = Y(GeomFromText(AsText(point1)));
set lat2 = Y(GeomFromText(AsText(point2)));
set d_lat = radians(lat2 - lat1);
set d_lon = radians(lon2 - lon1);
set lat1 = radians(lat1);
set lat2 = radians(lat2);
set R = 6372.8; -- in kilometers
set a = sin(d_lat / 2.0) * sin(d_lat / 2.0) + sin(d_lon / 2.0) * sin(d_lon / 2.0) * cos(lat1) * cos(lat2);
set c = 2 * asin(sqrt(a));
return R * c;
end
||
delimiter ;
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