Question

我试图创建一个接受可变数量的输入参数的存储过程，并根据此执行插入或替换任务。由于我正在使用postgres版本9.0，我无法按照建议的here使用UPSERT，而是使用if-then方法。存储过程返回void。

我在存储过程的最后一个END附近收到错误，就在$$之前，我想我错过了标点符号或类似的东西，我试图在最后两个END之间添加一个分号，但它没有＆＃39;工作。

查询很长，但我得到的语法错误可能是微不足道的，我道歉但我是postgres存储过程世界的新手。我附上一个＆＃34;伪代码＆＃34;简短版本和整个版本。

伪代码版

CREATE OR REPLACE FUNCTION function(
    IN parameter,
    ...
    )
RETURNS void AS
$$
BEGIN   
    CASE 
    WHEN(parameters) IS NULL THEN
          IF condition
          THEN
            UPDATE ...;
          ELSE 
            INSERT ...;
          END IF;
    WHEN ...
    ELSE
        IF condition
          THEN
            UPDATE ...;
          ELSE 
            INSERT ...;
          END IF;
    END
END;
$$ 
LANGUAGE 'plpgsql';

完整版

CREATE OR REPLACE FUNCTION insert_peronospora (
    IN _id_stazione  int,
    IN _lw_threshold numeric,
    IN _starting_condition_time   timestamp,
    IN _phenologic_condition_time timestamp = NULL,
    IN _germination_time timestamp = NULL,
    IN _infestation_percentage numeric = NULL,
    IN _infestation_time timestamp = NULL,
    IN _secondary_infestation_time timestamp = NULL,
    IN _secondary_infestation_number int = NULL
    )
RETURNS void AS
$$
BEGIN   
    CASE 
    WHEN(_phenologic_condition_time, _germination_time, _infestation_percentage, _infestation_time, _secondary_infestation_time, _secondary_infestation_number) IS NULL THEN
          IF EXISTS (SELECT id_stazione FROM dss_vite.peronospora WHERE id_stazione = _id_stazione and lw_threshold = _lw_threshold)
          THEN
            update dss_vite.peronospora 
            set starting_condition_time = _starting_condition_time 
            where id_stazione= _id_stazione and lw_threshold = _lw_threshold;
          ELSE 
            INSERT INTO dss_vite.peronospora (id_stazione, lw_threshold, starting_condition_time) VALUES(_id_stazione, _lw_threshold, _starting_condition_time);
          END IF;
    WHEN(_germination_time, _infestation_percentage, _infestation_time, _secondary_infestation_time, _secondary_infestation_number) IS NULL THEN
          IF EXISTS (SELECT id_stazione FROM dss_vite.peronospora WHERE id_stazione = _id_stazione and lw_threshold = _lw_threshold)
          THEN
            update dss_vite.peronospora 
            set starting_condition_time = _starting_condition_time,
            phenologic_condition_time = _phenologic_condition_time
            where id_stazione= _id_stazione and lw_threshold = _lw_threshold;
          ELSE 
            INSERT INTO dss_vite.peronospora (id_stazione, lw_threshold, starting_condition_time, phenologic_condition_time) 
            VALUES(_id_stazione, _lw_threshold, _starting_condition_time, _phenologic_condition_time);
          END IF;
    WHEN(_infestation_percentage, _infestation_time, _secondary_infestation_time, _secondary_infestation_number) IS NULL THEN
          IF EXISTS (SELECT id_stazione FROM dss_vite.peronospora WHERE id_stazione = _id_stazione and lw_threshold = _lw_threshold)
          THEN
            update dss_vite.peronospora 
            set starting_condition_time = _starting_condition_time,
            phenologic_condition_time = _phenologic_condition_time,
            germination_time = _germination_time
            where id_stazione= _id_stazione and lw_threshold = _lw_threshold;
          ELSE 
            INSERT INTO dss_vite.peronospora (id_stazione, lw_threshold, starting_condition_time, phenologic_condition_time, germination_time) 
            VALUES(_id_stazione, _lw_threshold, _starting_condition_time, _phenologic_condition_time, _germination_time);
          END IF;
    WHEN(_infestation_time, _secondary_infestation_time, _secondary_infestation_number) IS NULL THEN
          IF EXISTS (SELECT id_stazione FROM dss_vite.peronospora WHERE id_stazione = _id_stazione and lw_threshold = _lw_threshold)
          THEN
            update dss_vite.peronospora 
            set starting_condition_time = _starting_condition_time,
            phenologic_condition_time = _phenologic_condition_time,
            germination_time = _germination_time,
            infestation_percentage = _infestation_percentage
            where id_stazione= _id_stazione and lw_threshold = _lw_threshold;
          ELSE 
            INSERT INTO dss_vite.peronospora (id_stazione, lw_threshold, starting_condition_time, phenologic_condition_time, germination_time, infestation_percentage) 
            VALUES(_id_stazione, _lw_threshold, _starting_condition_time, _phenologic_condition_time, _germination_time, _infestation_percentage);
          END IF;
    WHEN(_secondary_infestation_time, _secondary_infestation_number) IS NULL THEN
          IF EXISTS (SELECT id_stazione FROM dss_vite.peronospora WHERE id_stazione = _id_stazione and lw_threshold = _lw_threshold)
          THEN
            update dss_vite.peronospora 
            set starting_condition_time = _starting_condition_time,
            phenologic_condition_time = _phenologic_condition_time,
            germination_time = _germination_time,
            infestation_percentage = _infestation_percentage,
            infestation_time = _infestation_time
            where id_stazione= _id_stazione and lw_threshold = _lw_threshold;
          ELSE 
            INSERT INTO dss_vite.peronospora (id_stazione, lw_threshold, starting_condition_time, phenologic_condition_time, germination_time, infestation_percentage,infestation_time) 
            VALUES(_id_stazione, _lw_threshold, _starting_condition_time, _phenologic_condition_time, _germination_time, _infestation_percentage, _infestation_time);
          END IF;
    ELSE
        IF EXISTS (SELECT id_stazione FROM dss_vite.peronospora WHERE id_stazione = _id_stazione and lw_threshold = _lw_threshold)
          THEN
            update dss_vite.peronospora 
            set starting_condition_time = _starting_condition_time,
            phenologic_condition_time = _phenologic_condition_time,
            germination_time = _germination_time,
            infestation_percentage = _infestation_percentage,
            infestation_time = _infestation_time,
            secondary_infestation_time = _secondary_infestation_time,
            secondary_infestation_number = _secondary_infestation_number
            where id_stazione= _id_stazione and lw_threshold = _lw_threshold;
          ELSE 
            INSERT INTO dss_vite.peronospora (id_stazione, lw_threshold, starting_condition_time, phenologic_condition_time, germination_time, infestation_percentage,infestation_time, secondary_infestation_time,secondary_infestation_number) 
            VALUES(_id_stazione, _lw_threshold, _starting_condition_time, _phenologic_condition_time, _germination_time, _infestation_percentage, _infestation_time,_secondary_infestation_time, _secondary_infestation_number);
          END IF;
    END
END;
$$ 
LANGUAGE 'plpgsql';

Answer 1

应使用CASE

关闭END CASE语句

          ...
          ELSE 
            INSERT INTO dss_vite.peronospora (id_stazione, lw_threshold, starting_condition_time, phenologic_condition_time, germination_time, infestation_percentage,infestation_time, secondary_infestation_time,secondary_infestation_number) 
            VALUES(_id_stazione, _lw_threshold, _starting_condition_time, _phenologic_condition_time, _germination_time, _infestation_percentage, _infestation_time,_secondary_infestation_time, _secondary_infestation_number);
          END IF;
    END CASE;
END;

请阅读有关Control Structures.

的文档

带有动态参数的postgres存储过程中的语法错误

1 个答案: