org.apache.hadoop.mapreduce.lib.db.DBConfiguration.getOutputFieldNames()方法的使用及代码示例

本文整理了Java中org.apache.hadoop.mapreduce.lib.db.DBConfiguration.getOutputFieldNames()方法的一些代码示例，展示了DBConfiguration.getOutputFieldNames()的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。DBConfiguration.getOutputFieldNames()方法的具体详情如下：
包路径：org.apache.hadoop.mapreduce.lib.db.DBConfiguration
类名称：DBConfiguration
方法名：getOutputFieldNames

DBConfiguration.getOutputFieldNames介绍

暂无

代码示例

代码示例来源：origin: io.hops/hadoop-mapreduce-client-core

/** {@inheritDoc} */
public RecordWriter getRecordWriter(TaskAttemptContext context)
throws IOException {
DBConfiguration dbCOnf= new DBConfiguration(context.getConfiguration());
String tableName = dbConf.getOutputTableName();
String[] fieldNames = dbConf.getOutputFieldNames();

if(fieldNames == null) {
fieldNames = new String[dbConf.getOutputFieldCount()];
}

try {
Connection cOnnection= dbConf.getConnection();
PreparedStatement statement = null;
DatabaseMetaData dbMeta = connection.getMetaData();
this.dbProductName = dbMeta.getDatabaseProductName().toUpperCase();
statement = connection.prepareStatement(
constructQuery(tableName, fieldNames));
return new DBRecordWriter(connection, statement);
} catch (Exception ex) {
throw new IOException(ex.getMessage());
}
}

代码示例来源：origin: io.prestosql.hadoop/hadoop-apache

/** {@inheritDoc} */
public RecordWriter getRecordWriter(TaskAttemptContext context)
throws IOException {
DBConfiguration dbCOnf= new DBConfiguration(context.getConfiguration());
String tableName = dbConf.getOutputTableName();
String[] fieldNames = dbConf.getOutputFieldNames();

if(fieldNames == null) {
fieldNames = new String[dbConf.getOutputFieldCount()];
}

try {
Connection cOnnection= dbConf.getConnection();
PreparedStatement statement = null;
statement = connection.prepareStatement(
constructQuery(tableName, fieldNames));
return new DBRecordWriter(connection, statement);
} catch (Exception ex) {
throw new IOException(ex.getMessage());
}
}

代码示例来源：origin: com.github.jiayuhan-it/hadoop-mapreduce-client-core

/** {@inheritDoc} */
public RecordWriter getRecordWriter(TaskAttemptContext context)
throws IOException {
DBConfiguration dbCOnf= new DBConfiguration(context.getConfiguration());
String tableName = dbConf.getOutputTableName();
String[] fieldNames = dbConf.getOutputFieldNames();

if(fieldNames == null) {
fieldNames = new String[dbConf.getOutputFieldCount()];
}

try {
Connection cOnnection= dbConf.getConnection();
PreparedStatement statement = null;
statement = connection.prepareStatement(
constructQuery(tableName, fieldNames));
return new DBRecordWriter(connection, statement);
} catch (Exception ex) {
throw new IOException(ex.getMessage());
}
}

代码示例来源：origin: ch.cern.hadoop/hadoop-mapreduce-client-core

/** {@inheritDoc} */
public RecordWriter getRecordWriter(TaskAttemptContext context)
throws IOException {
DBConfiguration dbCOnf= new DBConfiguration(context.getConfiguration());
String tableName = dbConf.getOutputTableName();
String[] fieldNames = dbConf.getOutputFieldNames();

if(fieldNames == null) {
fieldNames = new String[dbConf.getOutputFieldCount()];
}

try {
Connection cOnnection= dbConf.getConnection();
PreparedStatement statement = null;
statement = connection.prepareStatement(
constructQuery(tableName, fieldNames));
return new DBRecordWriter(connection, statement);
} catch (Exception ex) {
throw new IOException(ex.getMessage());
}
}

代码示例来源：origin: org.apache.hadoop/hadoop-mapred

/** {@inheritDoc} */
public RecordWriter getRecordWriter(TaskAttemptContext context)
throws IOException {
DBConfiguration dbCOnf= new DBConfiguration(context.getConfiguration());
String tableName = dbConf.getOutputTableName();
String[] fieldNames = dbConf.getOutputFieldNames();

if(fieldNames == null) {
fieldNames = new String[dbConf.getOutputFieldCount()];
}

try {
Connection cOnnection= dbConf.getConnection();
PreparedStatement statement = null;
statement = connection.prepareStatement(
constructQuery(tableName, fieldNames));
return new DBRecordWriter(connection, statement);
} catch (Exception ex) {
throw new IOException(ex.getMessage());
}
}

代码示例来源：origin: org.apache.hadoop/hadoop-mapred-test

public void testSetOutput() throws IOException {
Job job = Job.getInstance(new Configuration());
DBOutputFormat.setOutput(job, "hadoop_output", fieldNames);

DBConfiguration dbCOnf= new DBConfiguration(job.getConfiguration());
String actual = format.constructQuery(dbConf.getOutputTableName()
, dbConf.getOutputFieldNames());

assertEquals(expected, actual);

job = Job.getInstance(new Configuration());
dbCOnf= new DBConfiguration(job.getConfiguration());
DBOutputFormat.setOutput(job, "hadoop_output", nullFieldNames.length);
assertNull(dbConf.getOutputFieldNames());
assertEquals(nullFieldNames.length, dbConf.getOutputFieldCount());

actual = format.constructQuery(dbConf.getOutputTableName()
, new String[dbConf.getOutputFieldCount()]);

assertEquals(nullExpected, actual);
}

代码示例来源：origin: ch.cern.hadoop/hadoop-mapreduce-client-jobclient

public void testSetOutput() throws IOException {
Job job = Job.getInstance(new Configuration());
DBOutputFormat.setOutput(job, "hadoop_output", fieldNames);

DBConfiguration dbCOnf= new DBConfiguration(job.getConfiguration());
String actual = format.constructQuery(dbConf.getOutputTableName()
, dbConf.getOutputFieldNames());

assertEquals(expected, actual);

job = Job.getInstance(new Configuration());
dbCOnf= new DBConfiguration(job.getConfiguration());
DBOutputFormat.setOutput(job, "hadoop_output", nullFieldNames.length);
assertNull(dbConf.getOutputFieldNames());
assertEquals(nullFieldNames.length, dbConf.getOutputFieldCount());

actual = format.constructQuery(dbConf.getOutputTableName()
, new String[dbConf.getOutputFieldCount()]);

assertEquals(nullExpected, actual);
}