数据库连接长时间空闲后,爆连接已经关闭的解决方法-优快云博客

本文介绍了如何通过设置验证查询、测试连接和预测试查询来解决应用启动时出现的连接已关闭错误。通过使用ApacheDBCP和Proxool的数据源配置，确保了连接在返回给用户前的有效性和稳定性。

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<p style="">在很多场合都碰到有人提问: 第二天第一次访问应用,总是报连接已经关闭(Connection Close)

<p style=""><a style="color: #2970a6; text-decoration: none;" href="http://commons.apache.org/dbcp/api-1.4/org/apache/commons/dbcp/BasicDataSource.html" target="_blank">Apache DBCP</a>:
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dataSource.<span style="color: #006633;">setValidationQuery</span><span style="color: #009900;">(</span><span style="color: #0000ff;">'select 1'</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span>

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<table style="border-bottom: #cccccc 2px solid; border-left: #cccccc 2px solid; background-color: #ffffff; margin: 5px 0px 10px; width: 586px; border-collapse: collapse; border-top: #cccccc 2px solid; border-right: #cccccc 2px solid;" border="0"><tbody><tr id="p3092">
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dataSource.<span style="color: #006633;">setTestConnectionOnCheckout</span><span style="color: #009900;">(</span><span style="color: #000066; font-weight: bold;">true</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span>
dataSource.<span style="color: #006633;">setPreferredTestQuery</span><span style="color: #009900;">(</span><span style="color: #0000ff;">'select 1'</span><span style="color: #009900;">)</span>

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<p style=""><a style="color: #2970a6; text-decoration: none;" href="http://proxool.sourceforge.net/api-dev/org/logicalcobwebs/proxool/ProxoolDataSource.html" target="_blank">Proxool</a>:
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<table style="border-bottom: #cccccc 2px solid; border-left: #cccccc 2px solid; background-color: #ffffff; margin: 5px 0px 10px; width: 586px; border-collapse: collapse; border-top: #cccccc 2px solid; border-right: #cccccc 2px solid;" border="0"><tbody><tr id="p3093">
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dataSource.<span style="color: #006633;">setTestBeforeUse</span><span style="color: #009900;">(</span><span style="color: #000066; font-weight: bold;">true</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span>
dataSource.<span style="color: #006633;">setHouseKeepingTestSql</span><span style="color: #009900;">(</span><span style="color: #0000ff;">'select 1'</span><span style="color: #009900;">)</span>

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<p style="">其实原来也就这么简单,返回连接给用户之前,先执行一条简单无害快速的SQL