kettle8.2 java调用kettle API 自动生成Transformation转换
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.KettleException;
import org.pentaho.di.core.plugins.PluginRegistry;
import org.pentaho.di.core.plugins.StepPluginType;
import org.pentaho.di.core.xml.XMLHandler;
import org.pentaho.di.repository.kdr.KettleDatabaseRepository;
import org.pentaho.di.repository.kdr.KettleDatabaseRepositoryMeta;
import org.pentaho.di.trans.Trans;
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;
import org.w3c.dom.Document;
public class KettleGenerateTrans {
public static KettleGenerateTrans transDemo;
// 两个库中的表名
public static String bjdt_tablename = "acc_repayschedule";
public static String kettle_tablename = "acc_repayschedule";
// 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 = {
"" +
"
"
"
"
"
"
"
"
"
"
"EXTRA_OPTION_ORACLE.characterEncoding
"
"
,
"" +
"
"
"
"
"
"
"
"
"
"
"EXTRA_OPTION_MYSQL.characterEncoding
"
"
};
/**
* @param args
*/
public static void main(String[] args) {
try {
KettleEnvironment.init();
transDemo = new KettleGenerateTrans();
TransMeta transMeta = transDemo.generateMyOwnTrans();
String transXml = transMeta.getXML();
String transName = "update_insert_Trans.ktr";
File file = new File(transName);
FileUtils.writeStringToFile(file, transXml, "UTF-8");
System.out.println("transXml:"+transXml);
//System.out.println(databasesXML.length+"\n"+databasesXML[0]+"\n"+databasesXML[1]);
String xmls = " \n" + transMeta.getXML().toString();
Document doc = XMLHandler.loadXMLString(xmls);
//--------------------------------------------------------------------------------------------
//KettleDatabaseRepository repository = KettleUtil.getRepository();
KettleEnvironment.init();
//数据库连接元对象
DatabaseMeta databaseMeta = new DatabaseMeta("test", "MYSQL", "Native", "localhost", "kettledb", "3306", "kettle", "kettle123");
//DatabaseMeta databaseMeta = new DatabaseMeta("test", "ORACLE", "Native", "172.16.31.120", "KettleDB", "1521", "kettleuser", "kettleuser");
//资源库元对象
KettleDatabaseRepositoryMeta repositoryInfo = new KettleDatabaseRepositoryMeta();
repositoryInfo.setConnection(databaseMeta);
//资源库
KettleDatabaseRepository repository = new KettleDatabaseRepository();
repository.init(repositoryInfo);
repository.connect("admin", "admin");
//判断是否连接成功
if (repository.isConnected()) {
System.out.println( "connected" );
}else{
System.out.println("error");
}
//--------------------------------------------------------------------------------------------
TransMeta tm = new TransMeta();
tm.loadXML(doc.getDocumentElement(), repository, false);
tm.setRepositoryDirectory(repository.findDirectory("/"));
Trans trans=new Trans(tm);
trans.execute(null);
trans.setParameterValue("characterEncoding", "utf-8");
} 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 KettleException
*/
public TransMeta generateMyOwnTrans() throws KettleException{
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
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");
// java.util.Properties p = new java.util.Properties();
// p.setProperty("attribute", value)
//
// database_bjdt.setAttributes(attributes);
tableInput.setDatabaseMeta(database_bjdt);
String select_sql = "SELECT * 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","dept_no","dept_name","dept_sex","dept_addr"} ;
String [] updateStream = {"id","dept_no","dept_name","dept_sex","dept_addr"};
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;
}
}