| 程序包 | 说明 |
|---|---|
| org.apache.hadoop.mapred.lib.db |
org.apache.hadoop.mapred.lib.db Package
This package contains a library to read records from a database as an
input to a mapreduce job, and write the output records to the database.
|
| 限定符和类型 | 类和说明 |
|---|---|
class |
DBInputFormat<T extends DBWritable>
A InputFormat that reads input data from an SQL table.
|
class |
DBOutputFormat<K extends DBWritable,V>
A OutputFormat that sends the reduce output to a SQL table.
|
| 限定符和类型 | 类和说明 |
|---|---|
static class |
DBInputFormat.NullDBWritable
A Class that does nothing, implementing DBWritable
|
| 限定符和类型 | 方法和说明 |
|---|---|
static void |
DBInputFormat.setInput(JobConf job,
Class<? extends DBWritable> inputClass,
String inputQuery,
String inputCountQuery)
Initializes the map-part of the job with the appropriate input settings.
|
static void |
DBInputFormat.setInput(JobConf job,
Class<? extends DBWritable> inputClass,
String tableName,
String conditions,
String orderBy,
String... fieldNames)
Initializes the map-part of the job with the appropriate input settings.
|
Copyright © 2009 The Apache Software Foundation