mySQL 将过程存储到 JSON

Question

I created a stored procedure that generates a new table in the database consisting of many parts of other tables. The thing is that the table generated is not created. I want to send the table generated, let's say to a local location but in JSON format. Here is the procedure v1 I created.

USE DataBase;

DELIMITER $$
CREATE PROCEDURE ActaReuniones()
BEGIN
    CREATE TABLE IF NOT EXISTS meeting(
        idActaReunion INT AUTO_INCREMENT PRIMARY KEY,
        fecha_registro DATE,
        clientid INT,
        idgestor INT,
        Nombre_Cliente VARCHAR(255),
        Gestor VARCHAR(255),
        Perfil VARCHAR(255),
        TipoCliente VARCHAR(255),
        NombreCiudad VARCHAR(255),
        NombreDepartamento VARCHAR(255)
    )  ENGINE=INNODB;

    INSERT INTO meeting (
        idActaReunion,
        fecha_registro,
        clientid,
        idgestor,
        Nombre_Cliente,
        Gestor,
        Perfil,
        TipoCliente,
        NombreCiudad,
        NombreDepartamento
    )
    SELECT * FROM 
        # A lot of queries and joins from other tables to fill the table created.  
        # It works, believe me.
    WHERE AR.fecha_registro < '2020-11-01';
END$$
DELIMITER ;

After thinking about this, I do not want to duplicate de DataBase (which is exactly what will happen if I run this procedure), so I want to cut off the sections CREATE and INSERT, letting with only the SELECT section. This section is what I want to send as a JSON file to a local location. I assume that the data collected in the SELECT section is possible to write in a file without passing through a table created previously. Is it possible to do that? Thanks in advance.

Answer 1

I solved this issue after some research. My approach was as follows: As the table the query will go to is already created, but we don't want to duplicate the database, so we send the result of the query to the table (with a WHERE previously established); With this result, the JSON is created and this JSON is sent to the desired location. Then a TRUNCATE is performed on the table (all within the procedure):

DELIMITER $$
CREATE PROCEDURE ActaReuniones()
BEGIN
    INSERT INTO meeting (  #the table is already created in the DB
        idActaReunion,
        fecha_registro,
        clientid,
        idgestor,
        Nombre_Cliente,
        Gestor,
        Perfil,
        TipoCliente,
        NombreCiudad,
        NombreDepartamento  
        WHERE DATE
             # the query
        SELECT JSON_OBJECT
            ('idActareunion', idActaReunion,
             'fechaRegistro', fecha_registro, 
             'clientid', clientid,
             'idGestor', idgestor,
             'NombreCliente', Nombre_Cliente,
             'Gestor', Gestor,
             'Perfil', Perfil,
             'TipoCliente', TipoCliente,
             'NombreCiudad', NombreCiudad,
             'NombreDepartamento', NombreDepartamento
             )
        FROM meeting
        INTO OUTFILE '/location/meeting.json';
        
        TRUNCATE TABLE meeting;
           
    END$$
    DELIMITER ;

    
    
    

I call this procedure and it works, Now. I am trying to figure it out how could I update the json file with new data that it is include in the tables included in the query. I tried to update this file but it is not possible to re-write a json file that is already created. Let's see. Any hint I appreciate it. Kind regards