package com.yoodo.trans;
import java.io.File;
import org.apache.commons.io.FileUtils;
import org.pentaho.di.core.KettleEnvironment;
import org.pentaho.di.core.database.DatabaseMeta;
import org.pentaho.di.core.exception.KettleXMLException;
import org.pentaho.di.core.plugins.PluginRegistry;
import org.pentaho.di.core.plugins.StepPluginType;
import org.pentaho.di.trans.TransHopMeta;
import org.pentaho.di.trans.TransMeta;
import org.pentaho.di.trans.step.StepMeta;
import org.pentaho.di.trans.steps.insertupdate.InsertUpdateMeta;
import org.pentaho.di.trans.steps.tableinput.TableInputMeta;
public class TransDemo {
public static TransDemo transDemo;
/**
* 两个库中的表名
*/
public static String bjdt_tablename = "T_USER";
public static String kettle_tablename = "T_USER";
/**
* 数据库连接信息,适用于DatabaseMeta其中 一个构造器DatabaseMeta(String xml)
*/
public static final String[] databasesXML = {
"<?xml version=\"1.0\" encoding=\"UTF-8\"?>" +
"<connection>" +
"<name>bjdt</name>" +
"<server>192.168.1.101</server>" +
"<type>Oracle</type>" +
"<access>Native</access>" +
"<database>orcl</database>" +
"<port>1521</port>" +
"<username>bjdtuser</username>" +
"<password>password</password>" +
"</connection>",
"<?xml version=\"1.0\" encoding=\"UTF-8\"?>" +
"<connection>" +
"<name>kettle</name>" +
"<server>192.168.1.101</server>" +
"<type>Oracle</type>" +
"<access>Native</access>" +
"<database>orcl</database>" +
"<port>1521</port>" +
"<username>kettleuser</username>" +
"<password>password</password>" +
"</connection>"
};
/**
* @param args
*/
public static void main(String[] args) {
try {
KettleEnvironment.init();
transDemo = new TransDemo();
TransMeta transMeta = transDemo.generateMyOwnTrans();
String transXml = transMeta.getXML();
//System.out.println("transXml:"+transXml);
String transName = "etl/update_insert_Trans.ktr";
File file = new File(transName);
FileUtils.writeStringToFile(file, transXml, "UTF-8");
// System.out.println(databasesXML.length+"\n"+databasesXML[0]+"\n"+databasesXML[1]);
} catch (Exception e) {
e.printStackTrace();
return;
}
}
/**
* 生成一个转化,把一个数据库中的数据转移到另一个数据库中,只有两个步骤,第一个是表输入,第二个是表插入与更新操作
* @return
* @throws KettleXMLException
*/
public TransMeta generateMyOwnTrans() throws KettleXMLException{
System.out.println("************start to generate my own transformation***********");
TransMeta transMeta = new TransMeta();
//设置转化的名称
transMeta.setName("insert_update");
//添加转换的数据库连接
for (int i=0;i<databasesXML.length;i++){
DatabaseMeta databaseMeta = new DatabaseMeta(databasesXML[i]);
transMeta.addDatabase(databaseMeta);
}
//registry是给每个步骤生成一个标识Id用
PluginRegistry registry = PluginRegistry.getInstance();
//******************************************************************
//第一个表输入步骤(TableInputMeta)
TableInputMeta tableInput = new TableInputMeta();
String tableInputPluginId = registry.getPluginId(StepPluginType.class, tableInput);
//给表输入添加一个DatabaseMeta连接数据库
DatabaseMeta database_bjdt = transMeta.findDatabase("bjdt");
tableInput.setDatabaseMeta(database_bjdt);
String select_sql = "SELECT ID, USERNAME, PASSWORD, SEX, AGE, TELEPHONE, ADDRESS FROM "+bjdt_tablename;
tableInput.setSQL(select_sql);
//添加TableInputMeta到转换中
StepMeta tableInputMetaStep = new StepMeta(tableInputPluginId,"table input",tableInput);
//给步骤添加在spoon工具中的显示位置
tableInputMetaStep.setDraw(true);
tableInputMetaStep.setLocation(100, 100);
transMeta.addStep(tableInputMetaStep);
//******************************************************************
//******************************************************************
//第二个步骤插入与更新
InsertUpdateMeta insertUpdateMeta = new InsertUpdateMeta();
String insertUpdateMetaPluginId = registry.getPluginId(StepPluginType.class,insertUpdateMeta);
//添加数据库连接
DatabaseMeta database_kettle = transMeta.findDatabase("kettle");
insertUpdateMeta.setDatabaseMeta(database_kettle);
//设置操作的表
insertUpdateMeta.setTableName(kettle_tablename);
//设置用来查询的关键字
insertUpdateMeta.setKeyLookup(new String[]{"ID"});
insertUpdateMeta.setKeyStream(new String[]{"ID"});
insertUpdateMeta.setKeyStream2(new String[]{""});//一定要加上
insertUpdateMeta.setKeyCondition(new String[]{"="});
//设置要更新的字段
String[] updatelookup = {"ID","USERNAME","PASSWORD","SEX","AGE","TELEPHONE","ADDRESS"} ;
String [] updateStream = {"ID","USERNAME","PASSWORD","SEX","AGE","TELEPHONE","ADDRESS"};
Boolean[] updateOrNot = {false,true,true,true,true,true,true};
insertUpdateMeta.setUpdateLookup(updatelookup);
insertUpdateMeta.setUpdateStream(updateStream);
insertUpdateMeta.setUpdate(updateOrNot);
String[] lookup = insertUpdateMeta.getUpdateLookup();
//System.out.println("******:"+lookup[1]);
//System.out.println("insertUpdateMetaXMl:"+insertUpdateMeta.getXML());
//添加步骤到转换中
StepMeta insertUpdateStep = new StepMeta(insertUpdateMetaPluginId,"insert_update",insertUpdateMeta);
insertUpdateStep.setDraw(true);
insertUpdateStep.setLocation(250,100);
transMeta.addStep(insertUpdateStep);
//******************************************************************
//******************************************************************
//添加hop把两个步骤关联起来
transMeta.addTransHop(new TransHopMeta(tableInputMetaStep, insertUpdateStep));
System.out.println("***********the end************");
return transMeta;
}
}