Question

您好，

我在USER DEFINED JAVA CLASS中使用以下代码：

 //STEP 1. Import required packages import java.sql.*;  
import  org.pentaho.di.core.database.*;
  public class JDBCExample  {    
// JDBC driver name and database URL      
  static final String JDBC_DRIVER = "com.mysql.jdbc.Driver"; 
      static final String DB_URL ="jdbc:mysql://localhost:1111/mysql";

 //  Database credentials    
       static final String USER = "USER"; 
       static final String PASS = "PASS";
     public static void main(String[] args) {    
     Connection conn = null;    
     Statement stmt = null;    try{
    //STEP 2: Register JDBC driver
    Class.forName("com.mysql.jdbc.Driver");


 //STEP 3: Open a connection
 System.out.println("Connecting to a selected database...");
 conn = DriverManager.getConnection(DB_URL, USER, PASS);
 System.out.println("Connected database successfully...");

 //STEP 4: Execute a query
 System.out.println("Creating statement...");
 stmt = conn.createStatement();

 String sql = "select id,sorname,src_databasetype,src_databasename from table";
 ResultSet rs = stmt.executeQuery(sql);
 //STEP 5: Extract data from result set
 while(rs.next()){
    //Retrieve by column name
    int id  = rs.getInt("id");
    String sorname = rs.getString("sorname");
    String src_databasetype = rs.getString("src_databasetype");
    String src_databasename = rs.getString("src_databasename");

    //Display values
    System.out.print("ID: " + id);
    System.out.print(", sorname: " + sorname);
    System.out.print(", src_databasetype: " + src_databasetype);
    System.out.println(", src_databasename: " + src_databasename);
 }
 rs.close();    }catch(SQLException se){
 //Handle errors for JDBC
 se.printStackTrace();    }catch(Exception e){
 //Handle errors for Class.forName
 e.printStackTrace();    }finally{
 //finally block used to close resources
 try{
    if(stmt!=null)
       conn.close();
 }catch(SQLException se){
 }// do nothing
 try{
    if(conn!=null)
       conn.close();
 }catch(SQLException se){
    se.printStackTrace();
 }//end finally try    }//end try    System.out.println("Goodbye!"); }//end main }//end JDBCExample

通过命令提示符运行代码，其工作正常

但是单独运行步骤（在PDI中）我收到错误：非抽象类＆＃34;处理器＆＃34;必须实现方法＆＃34; boolean org.pentaho.di.trans.steps.userdefinedjavaclass.TransformClassBase.processRow（org.pentaho.di.trans.step.StepMetaInterface， org.pentaho.di.trans.step.StepDataInterface）抛出 org.pentaho.di.core.exception.KettleException＆＃34;

Answer 1

对于UDJC，我认为不是将代码放在main方法中，而是需要将它放在processRow（）中。

而不是使用 - public static void main（String [] args）使用 - public boolean processRow（StepMetaInterface smi，StepDataInterface sdi）抛出KettleException

我仍然怀疑它是否还会继续工作，因为我不明白你在尝试用这些代码做什么。

Answer 2

尝试如下在processRow方法中编写代码：

public boolean processRow(StepMetaInterface smi, StepDataInterface sdi) throws KettleException{


    Object[] r = getRow();

    if (r == null) {
      setOutputDone();
      return false;
    }
    Object[] outputRow = createOutputRow(r, data.outputRowMeta.size());

    //String row = getString(r)+",";
    //setValue(outputRow, row)
    putRow(data.outputRowMeta, outputRow);

    return true;

}

USER在pentaho数据集成中定义了java类步骤

2 个答案: