import org.apache.hadoop.mapreduce.lib.db.DataDrivenDBInputFormat.DataDrivenDBInputSplit; //导入依赖的package包/类
@Test(timeout = 10000)
public void testDataDrivenDBInputFormat() throws Exception {
  JobContext jobContext = mock(JobContext.class);
  Configuration configuration = new Configuration();
  configuration.setInt(MRJobConfig.NUM_MAPS, 1);

  when(jobContext.getConfiguration()).thenReturn(configuration);
  DataDrivenDBInputFormat<NullDBWritable> format = new DataDrivenDBInputFormat<NullDBWritable>();
  List<InputSplit> splits = format.getSplits(jobContext);
  assertEquals(1, splits.size());
  DataDrivenDBInputSplit split = (DataDrivenDBInputSplit) splits.get(0);
  assertEquals("1=1", split.getLowerClause());
  assertEquals("1=1", split.getUpperClause());

  // 2
  configuration.setInt(MRJobConfig.NUM_MAPS, 2);

  DataDrivenDBInputFormat.setBoundingQuery(configuration, "query");
  assertEquals("query",
      configuration.get(DBConfiguration.INPUT_BOUNDING_QUERY));

  Job job = mock(Job.class);
  when(job.getConfiguration()).thenReturn(configuration);
  DataDrivenDBInputFormat.setInput(job, NullDBWritable.class, "query",
      "Bounding Query");

  assertEquals("Bounding Query",
      configuration.get(DBConfiguration.INPUT_BOUNDING_QUERY));
}
 

import org.apache.hadoop.mapreduce.lib.db.DataDrivenDBInputFormat.DataDrivenDBInputSplit; //导入依赖的package包/类
private void assertSplits(String[] expectedSplitRE, 
    List<InputSplit> splits) throws IOException {
  assertEquals(expectedSplitRE.length, splits.size());
  for (int i = 0; i < expectedSplitRE.length; i++) {
    DataDrivenDBInputSplit split = (DataDrivenDBInputSplit) splits.get(i);
    String actualExpr = split.getLowerClause() + " " + split.getUpperClause();
    assertTrue("Split #" + (i+1) + " expression is wrong."
        + " Expected " + expectedSplitRE[i]
        + " Actual " + actualExpr,
        Pattern.matches(expectedSplitRE[i], actualExpr));
  }
}
 

import org.apache.hadoop.mapreduce.lib.db.DataDrivenDBInputFormat.DataDrivenDBInputSplit; //导入依赖的package包/类
@Test(timeout = 1000)
public void testDataDrivenDBInputFormat() throws Exception {
  JobContext jobContext = mock(JobContext.class);
  Configuration configuration = new Configuration();
  configuration.setInt(MRJobConfig.NUM_MAPS, 1);

  when(jobContext.getConfiguration()).thenReturn(configuration);
  DataDrivenDBInputFormat<NullDBWritable> format = new DataDrivenDBInputFormat<NullDBWritable>();
  List<InputSplit> splits = format.getSplits(jobContext);
  assertEquals(1, splits.size());
  DataDrivenDBInputSplit split = (DataDrivenDBInputSplit) splits.get(0);
  assertEquals("1=1", split.getLowerClause());
  assertEquals("1=1", split.getUpperClause());

  // 2
  configuration.setInt(MRJobConfig.NUM_MAPS, 2);

  DataDrivenDBInputFormat.setBoundingQuery(configuration, "query");
  assertEquals("query",
      configuration.get(DBConfiguration.INPUT_BOUNDING_QUERY));

  Job job = mock(Job.class);
  when(job.getConfiguration()).thenReturn(configuration);
  DataDrivenDBInputFormat.setInput(job, NullDBWritable.class, "query",
      "Bounding Query");

  assertEquals("Bounding Query",
      configuration.get(DBConfiguration.INPUT_BOUNDING_QUERY));
}