0

これらのいずれかを初めて使用しましたが、SQLコマンドとして実行すると失敗した場合でも、Stackoverflowで取得したため、これが機能すると確信しています。これはよくある問題のようで、いくつかの異なるコードセットを試してみましたが、同じ問題が発生するようです....

MySQL は次のように述べています。

1064 - SQL 構文にエラーがあります。使用する正しい構文については、MySQL サーバーのバージョンに対応するマニュアルを確認してください。

1 行目の '$$ CREATE FUNCTION GetDistance(coordinate1 VARCHAR(120), coordinate2 VARCHAR(')付近

DROP FUNCTION IF EXISTS `GetDistance`$$
CREATE FUNCTION `GetDistance`(coordinate1 VARCHAR(120), coordinate2 VARCHAR(120))
    RETURNS VARCHAR(120)
BEGIN
    DECLARE pos_comma1, pos_comma2 INT;
    DECLARE lon1, lon2, lat1, lat2, distance DECIMAL(18,12);
    select locate(',', coordinate1) into pos_comma1;
    select locate(',', coordinate1, pos_comma1+1) into pos_comma2;
    select CAST(substring(coordinate1, 1, pos_comma1-1) as DECIMAL(18,12)) into lon1;
    select CAST(substring(coordinate1, pos_comma1+1, pos_comma2-pos_comma1-1) as DECIMAL(18,12)) into lat1;
    select locate(',', coordinate2) into pos_comma1;
    select locate(',', coordinate2, pos_comma1+1) into pos_comma2;
    select CAST(substring(coordinate2, 1, pos_comma1-1) as DECIMAL(18,12)) into lon2;
    select CAST(substring(coordinate2, pos_comma1+1, pos_comma2-pos_comma1-1) as DECIMAL(18,12)) into lat2;
        select ((ACOS(SIN(lat1 * PI() / 180) * SIN(lat2 * PI() / 180) + COS(lat1 * PI() / 180) * COS(lat2 * PI() / 180) * COS((lon1 - lon2) * PI() / 180)) * 180 / PI()) * 60 * 1.1515) into distance;
    RETURN distance;
END$$

ありがとう - テラン

編集

やってみた…………

DROP FUNCTION IF EXISTS `GetDistance`;
delimiter $$
CREATE FUNCTION `GetDistance`(coordinate1 VARCHAR(120), coordinate2 VARCHAR(120))
    RETURNS VARCHAR(120)
BEGIN
    DECLARE pos_comma1, pos_comma2 INT;
    DECLARE lon1, lon2, lat1, lat2, distance DECIMAL(18,12);
    select locate(',', coordinate1) into pos_comma1;
    select locate(',', coordinate1, pos_comma1+1) into pos_comma2;
    select CAST(substring(coordinate1, 1, pos_comma1-1) as DECIMAL(18,12)) into lon1;
    select CAST(substring(coordinate1, pos_comma1+1, pos_comma2-pos_comma1-1) as DECIMAL(18,12)) into lat1;
    select locate(',', coordinate2) into pos_comma1;
    select locate(',', coordinate2, pos_comma1+1) into pos_comma2;
    select CAST(substring(coordinate2, 1, pos_comma1-1) as DECIMAL(18,12)) into lon2;
    select CAST(substring(coordinate2, pos_comma1+1, pos_comma2-pos_comma1-1) as DECIMAL(18,12)) into lat2;
        select ((ACOS(SIN(lat1 * PI() / 180) * SIN(lat2 * PI() / 180) + COS(lat1 * PI() / 180) * COS(lat2 * PI() / 180) * COS((lon1 - lon2) * PI() / 180)) * 180 / PI()) * 60 * 1.1515) into distance;
    RETURN distance;
END;
$$

と..........

DROP FUNCTION IF EXISTS `GetDistance`;
$$
CREATE FUNCTION `GetDistance`(coordinate1 VARCHAR(120), coordinate2 VARCHAR(120))
    RETURNS VARCHAR(120)
BEGIN
    DECLARE pos_comma1, pos_comma2 INT;
    DECLARE lon1, lon2, lat1, lat2, distance DECIMAL(18,12);
    select locate(',', coordinate1) into pos_comma1;
    select locate(',', coordinate1, pos_comma1+1) into pos_comma2;
    select CAST(substring(coordinate1, 1, pos_comma1-1) as DECIMAL(18,12)) into lon1;
    select CAST(substring(coordinate1, pos_comma1+1, pos_comma2-pos_comma1-1) as DECIMAL(18,12)) into lat1;
    select locate(',', coordinate2) into pos_comma1;
    select locate(',', coordinate2, pos_comma1+1) into pos_comma2;
    select CAST(substring(coordinate2, 1, pos_comma1-1) as DECIMAL(18,12)) into lon2;
    select CAST(substring(coordinate2, pos_comma1+1, pos_comma2-pos_comma1-1) as DECIMAL(18,12)) into lat2;
        select ((ACOS(SIN(lat1 * PI() / 180) * SIN(lat2 * PI() / 180) + COS(lat1 * PI() / 180) * COS(lat2 * PI() / 180) * COS((lon1 - lon2) * PI() / 180)) * 180 / PI()) * 60 * 1.1515) into distance;
    RETURN distance;
END;
$$

どちらも失敗…。

テラン

編集 - この作業スクリプトを見つけました.... リンク: http://datamoil.blogspot.co.uk/2011/09/calculate-distance-between-two-points.html

CREATE FUNCTION distance_between (from_lat DECIMAL(6, 3), from_lng DECIMAL(6, 3), to_lat DECIMAL(6, 3), to_lng DECIMAL(6, 3)) RETURNS DECIMAL(11, 3)
RETURN 6371 * 2 * ATAN2(SQRT(POW(SIN(RADIANS(to_lat - from_lat)/2), 2) + POW(SIN(RADIANS(to_lng - from_lng)/2), 2) * COS(RADIANS(from_lat)) * COS(RADIANS(to_lat))), SQRT(1 - POW(SIN(RADIANS(to_lat - from_lat)/2), 2) + POW(SIN(RADIANS(to_lng - from_lng)/2), 2) * COS(RADIANS(from_lat)) * COS(RADIANS(to_lat))));
4

2 に答える 2

1 
DROP FUNCTION IF EXISTS `GetDistance`;

delimiter $$
CREATE FUNCTION `GetDistance`...
   ...
   RETURN distance;
END;
$$
于 2012-04-29T13:42:52.813 に答える
0

このコードを実行する前に、区切り文字を $$ に変更する必要があります。

これは私にとってはうまくいきます（MySqlでテスト済み）

DROP FUNCTION IF EXISTS `GetDistance`;
delimiter $$
CREATE FUNCTION `GetDistance`(coordinate1 VARCHAR(120), coordinate2 VARCHAR(120))
    RETURNS VARCHAR(120)
BEGIN
    DECLARE pos_comma1, pos_comma2 INT;
    DECLARE lon1, lon2, lat1, lat2, distance DECIMAL(18,12);
    select locate(',', coordinate1) into pos_comma1;
    select locate(',', coordinate1, pos_comma1+1) into pos_comma2;
    select CAST(substring(coordinate1, 1, pos_comma1-1) as DECIMAL(18,12)) into lon1;
    select CAST(substring(coordinate1, pos_comma1+1, pos_comma2-pos_comma1-1) as     DECIMAL(18,12)) into lat1;
    select locate(',', coordinate2) into pos_comma1;
    select locate(',', coordinate2, pos_comma1+1) into pos_comma2;
    select CAST(substring(coordinate2, 1, pos_comma1-1) as DECIMAL(18,12)) into lon2;
    select CAST(substring(coordinate2, pos_comma1+1, pos_comma2-pos_comma1-1) as DECIMAL(18,12)) into lat2;
    select ((ACOS(SIN(lat1 * PI() / 180) * SIN(lat2 * PI() / 180) + COS(lat1 * PI() / 180) * COS(lat2 * PI() / 180) * COS((lon1 - lon2) * PI() / 180)) * 180 / PI()) * 60 * 1.1515) into distance;
    RETURN distance;
END;
$$
于 2012-04-29T13:40:51.253 に答える