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I'm trying to pull from multiple tables to insert into a table to create role assignments in moodle's database based on the categories that are created but I need it to update on duplicate key but I cant use ON DUPLICATE KEY UPDATE because the fields im trying to match on role id, context id, and user id are not primary keys in the mdl_role_assignments table.

insert into vclassmoodle.mdl_role_assignments (roleid,contextid,userid,timemodified,modifierid,itemid,sortorder) select 
mdl_role.id as roleid, mdl_context.id as contextid, mdl_user.id as userid, unix_timestamp() as timemodified, 3 as modifierid, 0 as itemid, 0 as sortorder
from
mdl_context
    left join
mdl_course_categories ON mdl_context.instanceid = mdl_course_categories.id
    left join
mdl_user ON mdl_course_categories.idnumber = mdl_user.idnumber
    join
mdl_role ON mdl_role.shortname = 'manager'
where mdl_context.contextlevel = 40 and mdl_course_categories.depth > 1

Let me know if I need to clarify on anything

Thanks

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1 回答 1

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刚刚查看了 /lib/accesslib.php 中的函数 role_assign()

如果有重复，那么它不会更新，所以你可以忽略重复。

尽管您应该真正使用 role_assign() 函数而不是直接插入数据。万一角色分配在未来发生变化，也因为它触发了可能在其他地方使用的 role_assigned 事件。

仍然使用您的查询，但忽略现有记录并创建一个循环来调用 role_assign()，就像这样

SELECT mdl_role.id as roleid,
       mdl_context.id as contextid,
       mdl_user.id as userid
FROM mdl_context
JOIN mdl_course_categories ON mdl_context.instanceid = mdl_course_categories.id
JOIN mdl_user ON mdl_course_categories.idnumber = mdl_user.idnumber
JOIN mdl_role ON mdl_role.shortname = 'manager'
WHERE mdl_context.contextlevel = 40
AND mdl_course_categories.depth > 1
AND NOT EXISTS (
    SELECT mdl_role_assignments.id
    FROM mdl_role_assignments
    WHERE mdl_role_assignments.roleid = mdl_role.id
    AND mdl_role_assignments.contextid = mdl_context.id
    AND mdl_role_assignments.userid = mdl_user.id
    AND mdl_role_assignments.itemid = 0
    AND mdl_role_assignments.component = '')

请注意，副本是角色标识、用户标识和上下文标识的组合，也是组件和项目标识的组合。所以 component = '' 也需要检查。

于 2014-04-22T17:11:41.073 回答