Impala's java development

In practical work, because impala queries faster, so there may be use to do database queries situation impala, impala can be operated through java code query

Download Impala  jdbc dependent

Download Path:

https://www.cloudera.com/downloads/connectors/impala/jdbc/2-5-28.html

Because cloudera a commercial nature of the company, jar it provides and will not appear on the open source maven repository, if needed in an enterprise, add to corporate maven PW.

 

Create a java project

Creating ordinary java project, the project relies added.

 

 

java  fire

public static void test(){         Connection con = null;         ResultSet rs = null;         PreparedStatement ps = null;         String JDBC_DRIVER = "com.cloudera.impala.jdbc41.Driver";         String CONNECTION_URL = "jdbc:impala://node-3:21050";         try         {             Class.forName(JDBC_DRIVER);             con = (Connection) DriverManager.getConnection(CONNECTION_URL);             ps = con.prepareStatement("select * from my_db.employee;");             rs = ps.executeQuery();             while (rs.next())             {                 System.out.println(rs.getString(1));                 System.out.println(rs.getString(2));                 System.out.println(rs.getString(3));             }         } catch (Exception e)         {             e.printStackTrace ();         } finally         {             try {                 rs.close();                 ps.close();                 con.close();             } catch (SQLException e) {                 e.printStackTrace ();             }         }     }     public static void main(String[] args) {         test();     }