MySQL函数声明。 不适用于PHP。 从phpmyadmin运行就可以了。 不创建功能

Question

I have function to cal miles distance:

DELIMITER //                                                                                      
    DROP FUNCTION IF EXISTS distance_miles//                                                      
    CREATE FUNCTION distance_miles(lat1 FLOAT, lon1 FLOAT, lat2 FLOAT, lon2 FLOAT)                
    RETURNS FLOAT(120)                                                                            
    BEGIN                                                                                         
        DECLARE pi, q1, q2, q3 FLOAT;                                                             
        DECLARE rads FLOAT DEFAULT 0;                                                             
        SET pi = PI();                                                                            
        SET lat1 = lat1 * pi / 180;                                                               
        SET lon1 = lon1 * pi / 180;                                                               
        SET lat2 = lat2 * pi / 180;                                                               
        SET lon2 = lon2 * pi / 180;                                                               
        SET q1 = COS(lon1-lon2);                                                                  
        SET q2 = COS(lat1-lat2);                                                                  
        SET q3 = COS(lat1+lat2);                                                                  
        SET rads = ACOS( 0.5*((1.0+q1)*q2 - (1.0-q1)*q3) );                                       
        RETURN 6378.388 * rads * 0.621371192;                                                     
    END//                                                                                         
DELIMITER ;                                                                                       

I run this as 1 query from phpmyadmin. It run's Ok. But i dont see this in routines table in information_schema.

Also, when am trying run this from php i got an error

 $mdb->query($mdb->mes("
     DELIMITER //                                                                                      
         DROP FUNCTION IF EXISTS distance_miles//                                                      
         CREATE FUNCTION distance_miles(lat1 FLOAT, lon1 FLOAT, lat2 FLOAT, lon2 FLOAT)                
         RETURNS FLOAT(120)                                                                            
         BEGIN                                                                                         
             DECLARE pi, q1, q2, q3 FLOAT;                                                             
             DECLARE rads FLOAT DEFAULT 0;                                                             
             SET pi = PI();                                                                            
             SET lat1 = lat1 * pi / 180;                                                               
             SET lon1 = lon1 * pi / 180;                                                               
             SET lat2 = lat2 * pi / 180;                                                               
             SET lon2 = lon2 * pi / 180;                                                               
             SET q1 = COS(lon1-lon2);                                                                  
             SET q2 = COS(lat1-lat2);                                                                  
             SET q3 = COS(lat1+lat2);                                                                  
             SET rads = ACOS( 0.5*((1.0+q1)*q2 - (1.0-q1)*q3) );                                       
             RETURN 6378.388 * rads * 0.621371192;                                                     
         END//                                                                                         
     DELIMITER ;                                                                                       

 "));                                                                                      

this one:

in db query: [\\r\\nDELIMITER ~~

Pls help me, what happens? Completely dont understood this.

1. How to look if function exists?
2. It will appear in information_shema table ROUTINES?
3. why is problem with php running this query?

====

SELECT ROUTINE_TYPE, ROUTINE_NAME FROM INFORMATION_SCHEMA.ROUTINES

Also - dont show this function ... strange this all...

---

Also this: SHOW CREATE FUNCTION distance_miles

Answers: MySQL said: Documentation

1305 - FUNCTION distance_miles does not exist

...

Answer 1

mysql_query doesn't support multiqueries. See manual .

You just need to remove the DELIMITER lines, split the queries by yourself, and the CREATE FUNCTION should work.

 $mdb->query($mdb->mes("DROP FUNCTION IF EXISTS distance_miles"));
 $mdb->query($mdb->mes("CREATE FUNCTION distance_miles(lat1 FLOAT, lon1 FLOAT, lat2 FLOAT, lon2 FLOAT)                
         RETURNS FLOAT(120)                                                                            
         BEGIN                                                                                         
             DECLARE pi, q1, q2, q3 FLOAT;                                                             
             DECLARE rads FLOAT DEFAULT 0;                                                             
             SET pi = PI();                                                                            
             SET lat1 = lat1 * pi / 180;                                                               
             SET lon1 = lon1 * pi / 180;                                                               
             SET lat2 = lat2 * pi / 180;                                                               
             SET lon2 = lon2 * pi / 180;                                                               
             SET q1 = COS(lon1-lon2);                                                                  
             SET q2 = COS(lat1-lat2);                                                                  
             SET q3 = COS(lat1+lat2);                                                                  
             SET rads = ACOS( 0.5*((1.0+q1)*q2 - (1.0-q1)*q3) );                                       
             RETURN 6378.388 * rads * 0.621371192;                                                     
         END                                                                        
 "));     

Answer 2

$mdb->query($mdb->mes("DROP FUNCTION IF EXISTS distance_miles"));
 $mdb->query($mdb->mes("delimiter $ 
CREATE FUNCTION distance_miles(lat1 FLOAT, lon1 FLOAT, lat2 FLOAT, lon2 FLOAT)                
         RETURNS FLOAT(120)                                                                            
        DETERMINISTIC BEGIN                                                                                         
             DECLARE pi, q1, q2, q3 FLOAT;                                                             
             DECLARE rads FLOAT DEFAULT 0;                                                             
             SET pi = PI();                                                                            
             SET lat1 = lat1 * pi / 180;                                                               
             SET lon1 = lon1 * pi / 180;                                                               
             SET lat2 = lat2 * pi / 180;                                                               
             SET lon2 = lon2 * pi / 180;                                                               
             SET q1 = COS(lon1-lon2);                                                                  
             SET q2 = COS(lat1-lat2);                                                                  
             SET q3 = COS(lat1+lat2);                                                                  
             SET rads = ACOS( 0.5*((1.0+q1)*q2 - (1.0-q1)*q3) );                                       
             RETURN 6378.388 * rads * 0.621371192;                                                     
         END $                                                                      
 "));