COUNT(*)从 Java执行一个简单的存储过程时，我遇到了间歇性问题。我正在使用不兼容的类型低于 java.sql.SQLException。请参阅示例存储过程，除了COUNT(*).
奇怪的是，以下异常并非一直发生，而是仅在一段时间后发生。请注意，COUNT在下面的过程中，总是会返回非常小的值，例如 40 或 50。它实际上从来没有变成 3 位数字，所以它应该可以作为整数。
我无法理解的是，如果它是实际的数据类型不匹配，而不是为什么它有时会工作并且突然停止工作而数据库上没有发生任何数据更新。
所以现在一切正常，几分钟或几个请求后突然一切停止工作。这是非常随机的，它突然开始抛出错误，而数据库中的数据没有任何变化。如果我重新启动服务器或重新部署相同的代码而不更改数据库中的任何代码或数据，它将再次开始工作。它正在嵌入式 tomcat 环境中部署它。
请检查下面的 JDBC 连接代码以及我在连接数据库时所做的配置。另请注意，保存该计数列值的变量此时定义为 Integer 而不是 Long。我可能可以通过在这里简单地更改变量类型来解决这个问题，但不确定我是否想改变它而不理解为什么有时它会正常工作并突然开始中断。
有许多数据点会引发类似类型的类型故障错误，因此将其更改为所有数据点可能很困难。顺便说一句，如果我重新启动服务器或重新部署相同的代码而不更改数据库中的任何代码或数据，它就会再次开始工作。
请在下面找到它有时但并非总是抛出的异常。
2018-10-11T19:50:45.175782Z app[web.1]: {"remoteAddress": "172.28.","serverName": "test","remoteUser": "-","timeLocal": "11/Oct/2018:19:50:45 +0000","request": "GET /v1/test?input=ABCD&_type=json&limit=200 HTTP/1.1","status": "500","bodyBytesSent": 127,"httpReferer": "-","httpUserAgent": "-","requestTime": "0.013","upstreamCacheStatus": "MISS","httpXForwardedFor": "172.28.9.10","suuid": "-","puuid": "-","env": "PPE"}
2018-10-11T19:50:45.181112Z app[web.1]: 2018-10-11T19:50:45,178 test ERROR [http-nio-8088-exec-2,,,] com.aaa.us.test.ws.dao.DataDao: [proc_test] Failed to fetch data for input - ABCD
2018-10-11T19:50:45.181152Z app[web.1]: java.sql.SQLException: Cannot set count: incompatible types, cannot convert java.lang.Long to int Query: CALL proc_test(?); Parameters: [ABCD]
2018-10-11T19:50:45.181162Z app[web.1]: at org.apache.commons.dbutils.AbstractQueryRunner.rethrow(AbstractQueryRunner.java:527) ~[commons-dbutils-1.7.jar!/:1.7]
2018-10-11T19:50:45.181186Z app[web.1]: at org.apache.commons.dbutils.QueryRunner.query(QueryRunner.java:391) ~[commons-dbutils-1.7.jar!/:1.7]
2018-10-11T19:50:45.1812Z app[web.1]: at org.apache.commons.dbutils.QueryRunner.query(QueryRunner.java:329) ~[commons-dbutils-1.7.jar!/:1.7]
2018-10-11T19:50:45.181213Z app[web.1]: at com.aaa.us.test.ws.dao.getData(DataDao.java:200) [classes!/:1.0.1]
2018-10-11T19:50:45.181228Z app[web.1]: at com.aaa.us.test.ws.DataImpl.getData(DataImpl.java:98) [classes!/:1.0.1]
2018-10-11T19:50:45.181241Z app[web.1]: at sun.reflect.GeneratedMethodAccessor92.invoke(Unknown Source) ~[?:?]
2018-10-11T19:50:45.181252Z app[web.1]: at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_181-heroku]
2018-10-11T19:50:45.181265Z app[web.1]: at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_181-heroku]
2018-10-11T19:50:45.181275Z app[web.1]: at org.apache.cxf.service.invoker.AbstractInvoker.performInvocation(AbstractInvoker.java:179) [cxf-core-3.2.0.jar!/:3.2.0]
2018-10-11T19:50:45.181286Z app[web.1]: at org.apache.cxf.service.invoker.AbstractInvoker.invoke(AbstractInvoker.java:96) [cxf-core-3.2.0.jar!/:3.2.0]
2018-10-11T19:50:45.181294Z app[web.1]: at org.apache.cxf.jaxrs.JAXRSInvoker.invoke(JAXRSInvoker.java:192) [cxf-rt-frontend-jaxrs-3.2.0.jar!/:3.2.0]
2018-10-11T19:50:45.181306Z app[web.1]: at org.apache.cxf.jaxrs.JAXRSInvoker.invoke(JAXRSInvoker.java:103) [cxf-rt-frontend-jaxrs-3.2.0.jar!/:3.2.0]
2018-10-11T19:50:45.181316Z app[web.1]: at org.apache.cxf.interceptor.ServiceInvokerInterceptor$1.run(ServiceInvokerInterceptor.java:59) [cxf-core-3.2.0.jar!/:3.2.0]
2018-10-11T19:50:45.181326Z app[web.1]: at org.apache.cxf.interceptor.ServiceInvokerInterceptor.handleMessage(ServiceInvokerInterceptor.java:96) [cxf-core-3.2.0.jar!/:3.2.0]
2018-10-11T19:50:45.181352Z app[web.1]: at org.apache.cxf.phase.PhaseInterceptorChain.doIntercept(PhaseInterceptorChain.java:308) [cxf-core-3.2.0.jar!/:3.2.0]
2018-10-11T19:50:45.181364Z app[web.1]: at org.apache.cxf.transport.ChainInitiationObserver.onMessage(ChainInitiationObserver.java:121) [cxf-core-3.2.0.jar!/:3.2.0]
2018-10-11T19:50:45.181376Z app[web.1]: at org.apache.cxf.transport.http.AbstractHTTPDestination.invoke(AbstractHTTPDestination.java:267) [cxf-rt-transports-http-3.2.0.jar!/:3.2.0]
2018-10-11T19:50:45.181385Z app[web.1]: at org.apache.cxf.transport.servlet.ServletController.invokeDestination(ServletController.java:234) [cxf-rt-transports-http-3.2.0.jar!/:3.2.0]
2018-10-11T19:50:45.181396Z app[web.1]: at org.apache.cxf.transport.servlet.ServletController.invoke(ServletController.java:208) [cxf-rt-transports-http-3.2.0.jar!/:3.2.0]
2018-10-11T19:50:45.181406Z app[web.1]: at org.apache.cxf.transport.servlet.ServletController.invoke(ServletController.java:160) [cxf-rt-transports-http-3.2.0.jar!/:3.2.0]
2018-10-11T19:50:45.181414Z app[web.1]: at org.apache.cxf.transport.servlet.CXFNonSpringServlet.invoke(CXFNonSpringServlet.java:191) [cxf-rt-transports-http-3.2.0.jar!/:3.2.0]
2018-10-11T19:50:45.181423Z app[web.1]: at org.apache.cxf.transport.servlet.AbstractHTTPServlet.handleRequest(AbstractHTTPServlet.java:301) [cxf-rt-transports-http-3.2.0.jar!/:3.2.0]
2018-10-11T19:50:45.181432Z app[web.1]: at org.apache.cxf.transport.servlet.AbstractHTTPServlet.doGet(AbstractHTTPServlet.java:225) [cxf-rt-transports-http-3.2.0.jar!/:3.2.0]
2018-10-11T19:50:45.182000+00:00 system[router]: at=info method=GET path=/v1/data?input=ABCD&_type=json&limit=10 host=test fwd="172.28.9.10" zone=va container=web.1 connect=0ms service=13ms status=500 bytes=475 request_id=e1aa4b25-f8ab-48c4-a89f-09fe9867d273
2018-10-11T19:50:45.18144Z app[web.1]: at javax.servlet.http.HttpServlet.service(HttpServlet.java:635) [tomcat-embed-core-8.5.23.jar!/:8.5.23]
2018-10-11T19:50:45.181449Z app[web.1]: at org.apache.cxf.transport.servlet.AbstractHTTPServlet.service(AbstractHTTPServlet.java:276) [cxf-rt-transports-http-3.2.0.jar!/:3.2.0]
2018-10-11T19:50:45.181458Z app[web.1]: at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) [tomcat-embed-core-8.5.23.jar!/:8.5.23]
2018-10-11T19:50:45.181467Z app[web.1]: at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-8.5.23.jar!/:8.5.23]
2018-10-11T19:50:45.181476Z app[web.1]: at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) [tomcat-embed-websocket-8.5.23.jar!/:8.5.23]
2018-10-11T19:50:45.181486Z app[web.1]: at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-8.5.23.jar!/:8.5.23]
2018-10-11T19:50:45.181497Z app[web.1]: at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-8.5.23.jar!/:8.5.23]
2018-10-11T19:50:45.181508Z app[web.1]: at org.springframework.boot.actuate.trace.WebRequestTraceFilter.doFilterInternal(WebRequestTraceFilter.java:110) [spring-boot-actuator-1.5.9.RELEASE.jar!/:1.5.9.RELEASE]
2018-10-11T19:50:45.181516Z app[web.1]: at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-4.3.14.RELEASE.jar!/:4.3.14.RELEASE]
2018-10-11T19:50:45.181524Z app[web.1]: at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-8.5.23.jar!/:8.5.23]
2018-10-11T19:50:45.181533Z app[web.1]: at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-8.5.23.jar!/:8.5.23]
2018-10-11T19:50:45.181544Z app[web.1]: at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99) [spring-web-4.3.14.RELEASE.jar!/:4.3.14.RELEASE]
2018-10-11T19:50:45.181553Z app[web.1]: at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-4.3.14.RELEASE.jar!/:4.3.14.RELEASE]
2018-10-11T19:50:45.181565Z app[web.1]: at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-8.5.23.jar!/:8.5.23]
2018-10-11T19:50:45.181577Z app[web.1]: at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-8.5.23.jar!/:8.5.23]
2018-10-11T19:50:45.181587Z app[web.1]: at org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:108) [spring-web-4.3.14.RELEASE.jar!/:4.3.14.RELEASE]
2018-10-11T19:50:45.181601Z app[web.1]: at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-4.3.14.RELEASE.jar!/:4.3.14.RELEASE]
2018-10-11T19:50:45.181612Z app[web.1]: at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-8.5.23.jar!/:8.5.23]
2018-10-11T19:50:45.181622Z app[web.1]: at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-8.5.23.jar!/:8.5.23]
2018-10-11T19:50:45.181633Z app[web.1]: at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:81) [spring-web-4.3.14.RELEASE.jar!/:4.3.14.RELEASE]
2018-10-11T19:50:45.181644Z app[web.1]: at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-4.3.14.RELEASE.jar!/:4.3.14.RELEASE]
2018-10-11T19:50:45.181656Z app[web.1]: at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-8.5.23.jar!/:8.5.23]
2018-10-11T19:50:45.181666Z app[web.1]: at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-8.5.23.jar!/:8.5.23]
2018-10-11T19:50:45.181677Z app[web.1]: at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197) [spring-web-4.3.14.RELEASE.jar!/:4.3.14.RELEASE]
2018-10-11T19:50:45.181688Z app[web.1]: at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-4.3.14.RELEASE.jar!/:4.3.14.RELEASE]
2018-10-11T19:50:45.181697Z app[web.1]: at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-8.5.23.jar!/:8.5.23]
2018-10-11T19:50:45.181708Z app[web.1]: at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-8.5.23.jar!/:8.5.23]
2018-10-11T19:50:45.181721Z app[web.1]: at org.springframework.boot.actuate.autoconfigure.MetricsFilter.doFilterInternal(MetricsFilter.java:106) [spring-boot-actuator-1.5.9.RELEASE.jar!/:1.5.9.RELEASE]
2018-10-11T19:50:45.181731Z app[web.1]: at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-4.3.14.RELEASE.jar!/:4.3.14.RELEASE]
2018-10-11T19:50:45.181742Z app[web.1]: at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-8.5.23.jar!/:8.5.23]
请注意，我们在这里使用 apache dbutil commons 库连接到 DB。
import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.ResultSetHandler;
import org.apache.commons.dbutils.handlers.BeanHandler;
import org.apache.commons.dbutils.handlers.BeanListHandler;
try {
QueryRunner run = new QueryRunner(readDataSource);
ResultSetHandler<Dto> h1 = new BeanHandler(Dto.class);
Dto data = (run.query("CALL proc_WS_GetAlpsHoldings_Metadata(?);", h1, input));
response.setMeta(extendedMetaModel(intPage, intLimit, holdings.size(), data.getCount(), input, null, data.getDate()));
} catch (SQLException ex) {
log.error("[proc_test] Failed to fetch data for input - " + input, ex);
throw new GenericException().errorCode(500).errorMessage("Failed to fetch data for input - " + input);
}
我将计数值定义为 int 的 Dto 类如下。
public class Dto {
private String date;
private String inceptionDate;
private int count;
public String getAsOfDate() {
return asOfDate;
}
public void setDate(String date) {
this.date = date;
}
public int getCount() {
return count;
}
public void setCount(int count) {
this.count = count;
}
}
请在下面找到我们设置的 JDBC 连接池属性。
datasource:
dbClientvendordata:
driverClassName: com.mysql.jdbc.Driver
url: jdbc:mysql://testmysqlread.something.com:3306/db_testdb?useOldAliasMetadataBehavior=true
username: "test"
password: "test"
auth: Container
maxActive: 10
maxIdle: 1
maxWait: 120000
testWhileIdle: true
timeBetweenEvictionRunsMillis: 10000
minEvictableIdleTimeMillis: 60000
removeAbandoned: true
removeAbandonedTimeout: 300
noAccessToProcedureBodies: true
请在下面找到简单的存储过程代码。
CREATE PROCEDURE `proc_test`(
input VARCHAR (10)
)
BEGIN
SELECT
`column1` AS `Ticker`,
DATE_FORMAT(`date`, '%Y-%m-%d') AS `date`,
COUNT(*) AS `count`
FROM
`db_testdb`.`table1`
WHERE
`column1` = input
GROUP BY
`column1`;
END$$
DELIMITER ;