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我正在尝试使用 Oracle JDBC 注册来自 Oracle 表 (19c) 的更改通知。由于查询包含一个 JOIN 我正在使用 BEST 努力模式。我的用户已被“授予”更改通知权限。

在这一点上，我只是想让通知者接受任何查询。这不是最终版本，但我知道我们需要一个涉及两个表的查询。将查询更改为更简单的查询会SELECT * from SCDAT.SECURITIES WHERE SCDAT.SECURITIES.INSTYPE = 28给出相同的输出。

测试代码

log.info("init changelistener");

    log.info("Get datasource from Spring application context");
    oracleDataSource = context.getBean("dataSource", OracleDataSource.class);

    log.info("Cet Oracle connection from datasource");
    oracle.jdbc.OracleConnection connection = (OracleConnection) oracleDataSource.getConnection();

    Properties properties = new Properties();
    properties.setProperty(OracleConnection.DCN_NOTIFY_ROWIDS, "true");
    properties.setProperty(OracleConnection.DCN_QUERY_CHANGE_NOTIFICATION, "true");
    properties.setProperty(OracleConnection.DCN_BEST_EFFORT, "true");
    log.info("DCN property settings: {}", properties);

    log.info("Register change notification to connection");
    dcr = connection.registerDatabaseChangeNotification(properties);

    //create statement
    Statement stmt = connection.createStatement();

    // associate the statement with the registration:
    ((OracleStatement) stmt).setDatabaseChangeRegistration(dcr);

    log.info("Executing query {}", query);
    ResultSet rs = stmt.executeQuery(query);

    while (rs.next()) {
        // Do Nothing
    }

    log.info("attach listener to the processor");
    dcr.addListener(this);

    String[] tableNames = dcr.getTables();
    for (int i = 0; i < tableNames.length; i++)
        log.info(tableNames[i] + " is part of the registration.");

日志输出

2021-03-30 12:56:15.983  INFO 5180 --- [main] c.c.dbnotifier.OracleChangeListener      : init changelistener
2021-03-30 12:56:15.983  INFO 5180 --- [main] c.c.dbnotifier.OracleChangeListener      : Get datasource from Spring application context
2021-03-30 12:56:15.983  INFO 5180 --- [main] c.c.dbnotifier.OracleChangeListener      : Cet Oracle connection from datasource
2021-03-30 12:56:16.061  INFO 5180 --- [main] c.c.dbnotifier.OracleChangeListener      : DCN property settings: {DCN_QUERY_CHANGE_NOTIFICATION=true, DCN_BEST_EFFORT=true, DCN_NOTIFY_ROWIDS=true}
2021-03-30 12:56:16.061  INFO 5180 --- [main] c.c.dbnotifier.OracleChangeListener      : Register change notification to connection
2021-03-30 12:56:16.077  INFO 5180 --- [main] c.c.dbnotifier.OracleChangeListener      : Executing query SELECT SCDAT.TRANSMAIN.TRANSEX from SCDAT.TRANSMAIN,SCDAT.SECURITIES WHERE SCDAT.TRANSMAIN.SECIK = SCDAT.SECURITIES.SECIK AND SCDAT.SECURITIES.INSTYPE = 28
2021-03-30 12:56:16.295  WARN 5180 --- [main] s.c.a.AnnotationConfigApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'oracleChangeListener': Invocation of init method failed; nested exception is java.sql.SQLException: ORA-29979: ikke støttet radstørrelse for endringsvarsling for spørringsresultat

此处解释了错误 ORA-29979 https://www.oraexcel.com/database-oracle-11gR2-ORA-29979，但根据 dbadmin，数据库上的 COMPATIBLE 设置为 19.0.0。

我应该补充一点，使用同一用户在 sqldeveloper 中运行查询可以正常工作。

关于如何进行的任何建议或想法？

/卡特琳娜

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1 回答 1

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您将不得不切换到“表更改通知”，因为您的表有太多列以支持“查询更改通知”。删除此行或将其注释掉：

// properties.setProperty(OracleConnection.DCN_QUERY_CHANGE_NOTIFICATION, "true");
于 2021-03-30T12:11:58.913 回答