使用PL/pgSQL中的动态查询创建数组

Question

我试图在plpgsql函数中创建一个带有动态选择查询的数组。不幸的是，我遇到了一个语法错误。

ERROR:  syntax error at or near "EXECUTE"
ZEILE 19:  SELECT DISTINCT INTO outputIdsToDelete ARRAY( EXECUTE findA...
                                                         ^

谁能帮帮我吗？以下是函数本身：

CREATE OR REPLACE FUNCTION deleteMAPPINGs(
   mapTable1_key text, mapping_table text, mapTable2_key text,
   table2 text, table2_key text,
   inputIdsToDelete bigint[]) RETURNS bigint[] AS
$BODY$
DECLARE
    outputIdsToDelete bigint[];
    findAllQuery text;
    findUnreferencedQuery text;
    BEGIN
    findAllQuery := 'SELECT DISTINCT ' || mapTable2_key ||
        ' FROM '  || mapping_table ||
        ' WHERE ' || mapTable1_key || ' = ANY(inputIdsToDelete)';
    findUnreferencedQuery := 'SELECT DISTINCT ' || table2_key || --find unused
        ' FROM ' || table2 ||
        ' WHERE ' || table2_key || ' NOT IN (' ||
            'SELECT DISTINCT ' || mapTable2_key || --all used
            ' FROM ' || mapping_table || ')';

    SELECT DISTINCT INTO outputIdsToDelete ARRAY( EXECUTE findAllQuery );

    DELETE FROM mapping_table WHERE 
        mapTable1_key = ANY(inputIdsToDelete) AND
        mapTable2_key = ANY(outputIdsToDelete);

    SELECT DISTINCT INTO outputIdsToDelete --overwrite with unused
        ARRAY(EXECUTE findUnreferencedQuery);

    RETURN outputIdsToDelete;
END;
$BODY$
LANGUAGE plpgsql VOLATILE
COST 100;

Answer 1

不能在SQL语句中使用EXECUTE——EXECUTE只是plpgsql语句，因此不能在SQL语句中使用-

EXECUTE string INTO variable