當我嘗試在MariaDB數據庫上創建此功能（使用點數據類型）時，為什么會出現此錯誤？

Question

我不太喜歡數據庫，在實現本教程時有以下疑問： https : //mariadb.org/jquery-and-gis-distance-in-mariadb/

所以基本上我的疑問是涉及到創建一個函數來計算MariaDB的數據庫上的兩個點之間的距離，這樣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

我的問題是，執行前一個語句會得到以下錯誤消息：

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

用2個紅色標記標記的PhpMyAdmin符號在上一條語句的第一行上顯示點數據類型：

CREATE FUNCTION earth_circle_distance(point1 point, point2 point) RETURNS double

但我不認為它可能是真正的問題（我想，也許是一些phpMyAdmin的不知道），因為它標志着紅也是這個cration查詢：

CREATE TABLE gis_point  (g POINT);

但它工作正常，沒有錯誤，並正確創建了表。

那么，錯了嗎？ 可以依靠PhpMyAdmin還是我缺少什么？ 此功能應存儲在哪里？

Answer 1

更改定界符。 否則，函數定義在第一個處結束; 這將使其不完整。

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 ;