Question

我在PostgreSQL数据库中创建了一个唯一约束，并将其设置为deferrable initially deferred。

例如，我在列order_num上有唯一键，我在数据库中有两行，如下所示：

id      order_num           description
1               1           'something no 1'
2               2           'something no 2'

当我尝试在数据库上执行此脚本时（即使按照这种非逻辑顺序），它运行良好：

begin transaction;
    insert into some_table(id, order_num, description) values(3, 2, 'something no 3');
    delete from some_table where id = 2;
end transaction;

但是当我尝试从应用程序执行此操作时（即使按逻辑顺序，先删除，然后插入），它说duplicate key value violates unique constraint。

有人知道hibernate有什么问题吗？我怎样才能设定延期？

编辑：好的，唯一约束包括id_ri_content，id_structure_table_column和element_order。

当我从PG管理员运行事务时，日志显示：

2014-03-17 13:45:15 CET LOG: statement: begin transaction; insert into ri_content_cell(id_ri_content_cell, id_ri_content, id_ri_structure_table_column, element_order, content) values(118, 41, 226, 2, '3'); insert into ri_content_cell(id_ri_content_cell, id_ri_content, id_ri_structure_table_column, element_order, content) values(119, 41, 228, 2, 'Zika'); delete from ri_content_cell where id_ri_content_cell in (120,121); end transaction;

虽然在java会话bean方法的hibernate中运行相同的操作会产生此错误日志：

2014-03-17 13:54:25 CET LOG: execute : select nextval ('ri_content_cell_seq') 2014-03-17 13:54:25 CET LOG: execute : select nextval ('ri_content_cell_seq') 2014-03-17 13:54:25 CET LOG: execute : insert into ri_content_cell (content, element_order, id_ri_content, id_ri_structure_table_column, id_ri_content_cell) values ($1, $2, $3, $4, $5) 2014-03-17 13:54:25 CET DETAIL: parameters: $1 = '2', $2 = '2', $3 = '41', $4 = '226', $5 = '136' 2014-03-17 13:54:25 CET ERROR: duplicate key value violates unique constraint "uk_ri_content_cell" 2014-03-17 13:54:25 CET DETAIL: Key (id_ri_content, id_ri_structure_table_column, element_order)=(41, 226, 2) already exists.

Answer 1

检查Hibernate正在使用的数据源的JTA是否设置为TRUE。

Postgres唯一约束在hibernate中不可延迟

1 个答案: