ItemReader 无法通过 PrestoDriver 读取行

Question

以下 ItemReader bean 通过 PrestDriver 读取行。执行批处理时，我收到此错误消息：

org.springframework.batch.core.step.skip.NonSkippableReadException: Non-skippable exception during read
at org.springframework.batch.core.step.item.FaultTolerantChunkProvider.read(FaultTolerantChunkProvider.java:105) ~[spring-batch-core-4.2.4.RELEASE.jar:4.2.4.RELEASE]
at org.springframework.batch.core.step.item.SimpleChunkProvider.doInIteration(SimpleChunkProvider.java:126) ~[spring-batch-core-4.2.4.RELEASE.jar:4.2.4.RELEASE]

.......

Caused by: org.springframework.dao.InvalidDataAccessApiUsageException: Attempt to process next row 
failed; SQL [SELECT * FROM ......]; getRow; nested exception is 
java.sql.SQLFeatureNotSupportedException: getRow

ItemReader 代码

@Bean
public ItemReader<ExportDto> itemReader() {
    DriverManagerDataSource dataSource = new DriverManagerDataSource();
    dataSource.setDriverClassName("com.facebook.presto.jdbc.PrestoDriver");
    dataSource.setUrl("jdbc:presto: ");
    dataSource.setUsername("....");
    dataSource.setPassword("....");

    JdbcCursorItemReader<ExportDto> reader = new JdbcCursorItemReader<ExportDto>();
    reader.setDataSource(dataSource);
    reader.setSql("SELECT * FROM .....'");
    BeanPropertyRowMapper<ExportDto> rowMapper = new BeanPropertyRowMapper<>(ExportDto.class);
    reader.setRowMapper(rowMapper);
    return reader;
}

我创建了一个“hello world”应用程序来测试驱动程序，这次使用普通的 JDBCDriver。本次测试成功。

 String url = "jdbc:presto:.....";
    Properties properties = new Properties();
    properties.setProperty("user", "....");
    properties.setProperty("password", "....");
    properties.setProperty("SSL", "true");
    try {
        Connection conn = DriverManager.getConnection(url, properties);
        if (conn == null) {
            System.out.print("NULL");
        } else {
            Statement stmt = conn.createStatement();
            String sql = "SELECT distinct .....";
            ResultSet rs = stmt.executeQuery(sql);
            // Extract data from result set
            while (rs.next()) {
                // Retrieve by column name
                String programs = rs.getString("prg");
            }
            // Clean-up environment
            rs.close();
            stmt.close();
            conn.close();
        }

知道为什么会这样吗？或者一些解决方法将不胜感激。

谢谢

Answer 1

默认情况下，JdbcCursorItemReader 在每个已处理的行之后验证游标的位置。此检查涉及 call to ResultSet#getRow() which does not seem to be supported as mentioned in the .

您可以使用 JdbcCursorItemReader#setVerifyCursorPosition 禁用此检查，直到 Presto 驱动程序支持此功能。

ItemReader 无法通过 PrestoDriver 读取行

ItemReader unable to read rows via PrestoDriver

spring

spring-batch

presto

presto-jdbc