[英]JDBC connection closes unexpectedly
我不时收到以下错误,我不知道为什么:
org.jooq.exception.DataAccessException: SQL [select "public"."RefreshTokens"."userId" from "public"."RefreshTokens" where "public"."RefreshTokens"."token" = ?]; This connection has been closed.
这是stacktrace中最重要的部分:
{
"class" : "org.postgresql.jdbc.PgConnection",
"method" : "checkClosed",
"file" : "PgConnection.java",
"line" : 783
}, {
"class" : "org.postgresql.jdbc.PgConnection",
"method" : "prepareStatement",
"file" : "PgConnection.java",
"line" : 1680
}, {
"class" : "org.postgresql.jdbc.PgConnection",
"method" : "prepareStatement",
"file" : "PgConnection.java",
"line" : 371
}, {
"class" : "org.jooq.impl.ProviderEnabledConnection",
"method" : "prepareStatement",
"file" : "ProviderEnabledConnection.java",
"line" : 109
}, {
"class" : "org.jooq.impl.SettingsEnabledConnection",
"method" : "prepareStatement",
"file" : "SettingsEnabledConnection.java",
"line" : 73
}, {
"class" : "org.jooq.impl.AbstractResultQuery",
"method" : "prepare",
"file" : "AbstractResultQuery.java",
"line" : 239
}, {
"class" : "org.jooq.impl.AbstractQuery",
"method" : "execute",
"file" : "AbstractQuery.java",
"line" : 322
}, {
"class" : "org.jooq.impl.AbstractResultQuery",
"method" : "fetchLazy",
"file" : "AbstractResultQuery.java",
"line" : 393
}, {
"class" : "org.jooq.impl.AbstractResultQuery",
"method" : "fetchLazy",
"file" : "AbstractResultQuery.java",
"line" : 380
}, {
"class" : "org.jooq.impl.AbstractResultQuery",
"method" : "fetchOne",
"file" : "AbstractResultQuery.java",
"line" : 545
}, {
"class" : "org.jooq.impl.SelectImpl",
"method" : "fetchOne",
"file" : "SelectImpl.java",
"line" : 2879
}
我将JOOQ(3.11.11)与Postgres(42.2.5.jre7)结合使用, DSLContext
如下方式创建连接和DSLContext
:
val conn = DriverManager.getConnection(
config.databaseUrl, config.databaseUser, config.databasePassword)
DSL.using(conn, SQLDialect.POSTGRES_10)
我以为JOOQ会为我管理连接,而我不必手动重新打开/打开/关闭它们。 我是否应该使用DataSource
代替DriverManager
for JOOQ来自动处理连接状态? 如果有人能告诉我为什么实际上断开连接,那就太好了。
尽管JOOQ
也可以某种程度上管理您的连接(使用DSL#using(String url, String username, String password)
,但它通常委托给基础ConnectionProvider
或DataSource
。
IMO,最好的方法是将JOOQ
(作为使用连接的执行者 )和您的连接管理器(作为监督连接打开和关闭的管理器 )完全分离。
一种方法是使用DataSource
, org.jooq.Configuration#derive(DataSource dataSource)
和DSL#using(Configuration configuration)
,如下所示:
javax.sql.DataSource ds = ...; // initialize DataSource
org.jooq.Configuration configuration = Configuration.derive(ds);
DSLContext dslContext = DSL.using(configuration);
Record r = dslContext.selectFrom(...).where.(...).fetchOne();
另请参见DSL javadocs , Configuration javadocs和此答案。
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