我在连接到 dockerized postgres 实例时遇到了很多麻烦。我得到的错误看起来像这样:
Exception in thread "main" org.postgresql.util.PSQLException: ERROR: relation "prescriptions" does not exist
Position: 29
at org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(QueryExecutorImpl.java:2284)
at org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java:2003)
at org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:200)
at org.postgresql.jdbc.PgStatement.execute(PgStatement.java:424)
at org.postgresql.jdbc.PgStatement.executeWithFlags(PgStatement.java:321)
at org.postgresql.jdbc.PgStatement.execute(PgStatement.java:313)
以下是重现问题的步骤。首先,我像这样设置数据库:
docker run -p 7654:5432 --name zoo_postgres -e POSTGRES_PASSWORD="stranger" -e POSTGRES_USER=stranger -d postgres
然后运行安装脚本,如下所示:
create DATABASE stranger;
create SCHEMA stranger;
CREATE TABLE prescriptions (
prescription_id BIGINT NOT NULL,
PRIMARY KEY (prescription_id)
);
CREATE USER stranger_user WITH ENCRYPTED password 'stranger_user';
grant CONNECT on DATABASE stranger to stranger_user;
grant USAGE on SCHEMA stranger to stranger_user;
GRANT SELECT ON ALL TABLES IN SCHEMA stranger TO stranger_user;
GRANT INSERT ON ALL TABLES IN SCHEMA stranger TO stranger_user;
GRANT DELETE ON ALL TABLES IN SCHEMA stranger TO stranger_user;
GRANT UPDATE ON ALL TABLES IN SCHEMA stranger TO stranger_user;
-- I've tried several variations of the line below, without any effect
ALTER USER stranger_user SET SEARCH_PATH to stranger,stranger_user,public;
在 Java 端,代码非常简单,如下所示:
public static void main(String[] args) throws Exception {
Class.forName("org.postgresql.Driver");
Connection connection = DriverManager.getConnection("jdbc:postgresql://localhost:7654/stranger","stranger_user", "stranger_user"); // this succeeds (suggesting the connection string is correct)
connection.setCatalog("stranger");
connection.setSchema("stranger");
Statement stmt = connection.createStatement();
stmt.execute("select prescription_id from prescriptions");
// code dies before getting to the close line.
connection.close();
System.out.println("Successfully connected using JDBC directly");
}
设置目录和模式无效,更改搜索路径也无效。一切都是小写的,所以我认为它与转义表名没有任何关系。我试过使用真实用户(并跳过用户帐户),省略数据库名称和其他几个技巧。我怀疑我连接到数据库的方式有问题,但我可以连接到使用 psql,如下所示:
% psql -h localhost -p 7654 -d postgres -U stranger_user
从这一点开始,我可以使用普通的 sql 访问表:
% psql -h localhost -p 7654 -d postgres -U stranger_user
Password for user stranger_user:
psql (9.4.6, server 9.5.2)
WARNING: psql major version 9.4, server major version 9.5.
Some psql features might not work.
Type "help" for help.
postgres=> \d
List of relations
Schema | Name | Type | Owner
----------+---------------+-------+----------
stranger | prescriptions | table | stranger
(1 row)
postgres=> select * from prescriptions;
prescription_id
-----------------
(0 rows)
postgres=> select * from stranger.prescriptions;
prescription_id
-----------------
(0 rows)
我正在使用最新版本的 postgres 驱动程序:"org.postgresql:postgresql:9.4+"
,并且看不到会导致此问题的任何其他内容。在这一点上,我没有想法,无法弄清楚出了什么问题。
最佳答案
您正在使用 psql
连接到端口 7654,然后在您的 JDBC URL 中连接到端口 6543。另外,您正在使用 连接到
,以及您的 JDBC URL 中的 postgres
数据库>psqlstranger
数据库。
这些差异可能是您所看到的异常的来源吗?
关于java - 通过 JDBC 的 Postgres 连接 : org. postgresql.util.PSQLException: ERROR: relation "prescriptions"does not exist,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/37636007/