Question

这是我的代码，用于获取图形信息数据表。我无法找到这个问题的原因。

google.setOnLoadCallback(drawVisualization);
function drawVisualization() {
    var sqlQuery = "sql?tq=select ProjectName, ExecutionDate, PassedWeekly, FailedWeekly &sqlQueryID=test_runs_week";
    var weeklyRunsQuery = new google.visualization.Query(sqlQuery);
    weeklyRunsQuery.send(handleWeeklyRunsResponse);
}
function handleWeeklyRunsResponse(queryWeeklyRunsResponse) {
    var responseDataTable = queryWeeklyRunsResponse.getDataTable();
    if (queryWeeklyRunsResponse.isError()) {
        alert(queryWeeklyRunsResponse.getDetailedMessage());
    }
    if (responseDataTable == null) {
        alert("Response is null");
        return;
    }
    if (responseDataTable.getNumberOfRows() < 0) {
        alert("Response has 0 rows");
    }
}

观察1：它给我以前访问过的图表页面的结果。
观察2：如果Tomcat服务器重新启动，它会给我一个＆＃34;错误消息作为内部错误＆＃34;
观察3：导航到其他图形页面并返回并执行此代码，它将为您提供之前访问过的页面。

这是WEBINF \ web.xml文件

<?xml version="1.0" encoding="ISO-8859-1"?>
<web-app xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"
    version="2.4">

    <description>
    </description>

    <servlet>
        <servlet-name>SqlDataSourceServlet</servlet-name>
        <description>SqlDataSourceServlet</description>
        <servlet-class>com.external.datasources.SqlDataSourceServlet</servlet-class>
    </servlet>

    <servlet-mapping>
        <servlet-name>SqlDataSourceServlet</servlet-name>
        <url-pattern>/htm/sql</url-pattern>
    </servlet-mapping>

    <welcome-file-list>
        <welcome-file>default.htm</welcome-file>
        <welcome-file>depreport.htm</welcome-file>
    </welcome-file-list>
</web-app>

谷歌图表查询语言抛出空指针异常

0 个答案: