接口 org.apache.hadoop.mapreduce.lib.db.DBWritable
的使用

使用DBWritable的程序包

程序包	说明
org.apache.hadoop.mapreduce.lib.db

org.apache.hadoop.mapreduce.lib.db中DBWritable的使用

类型参数类型为DBWritable的org.apache.hadoop.mapreduce.lib.db中的类

限定符和类型	类和说明
class	DataDrivenDBInputFormat<T extends DBWritable> A InputFormat that reads input data from an SQL table.
class	DataDrivenDBRecordReader<T extends DBWritable> A RecordReader that reads records from a SQL table, using data-driven WHERE clause splits.
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.
class	DBRecordReader<T extends DBWritable> A RecordReader that reads records from a SQL table.
class	MySQLDataDrivenDBRecordReader<T extends DBWritable> A RecordReader that reads records from a MySQL table via DataDrivenDBRecordReader
class	MySQLDBRecordReader<T extends DBWritable> A RecordReader that reads records from a MySQL table.
class	OracleDataDrivenDBInputFormat<T extends DBWritable> A InputFormat that reads input data from an SQL table in an Oracle db.
class	OracleDataDrivenDBRecordReader<T extends DBWritable> A RecordReader that reads records from a Oracle table via DataDrivenDBRecordReader
class	OracleDBRecordReader<T extends DBWritable> A RecordReader that reads records from an Oracle SQL table.

实现DBWritable的org.apache.hadoop.mapreduce.lib.db中的类

限定符和类型	类和说明
static class	DBInputFormat.NullDBWritable A Class that does nothing, implementing DBWritable

类型变量类型为DBWritable的org.apache.hadoop.mapreduce.lib.db中的方法参数

限定符和类型	方法和说明
static void	DBInputFormat.setInput(Job job, Class<? extends DBWritable> inputClass, String inputQuery, String inputCountQuery) Initializes the map-part of the job with the appropriate input settings.
static void	DataDrivenDBInputFormat.setInput(Job job, Class<? extends DBWritable> inputClass, String inputQuery, String inputBoundingQuery) setInput() takes a custom query and a separate "bounding query" to use instead of the custom "count query" used by DBInputFormat.
static void	DBInputFormat.setInput(Job 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.
static void	DataDrivenDBInputFormat.setInput(Job job, Class<? extends DBWritable> inputClass, String tableName, String conditions, String splitBy, String... fieldNames) Note that the "orderBy" column is called the "splitBy" in this version.
void	DBConfiguration.setInputClass(Class<? extends DBWritable> inputClass)