How to find column datatype from ResultSetMetaData in Java?


How to find column datatype from ResultSetMetaData in Java?


--Before executing java program execute these database scripts  >
create table EMPLOYEE(ID number(4),
   NAME varchar2(22),
   CREATION_DATE date,
   FILE_CLOB clob,
   FILE_BLOB blob);
commit;

--If table already exists then execute the DROP command >
drop table EMPLOYEE;

Programs JDBC- How to find column datatype from ResultSetMetaData in Java?

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
/** Copyright (c), AnkitMittal JavaMadeSoEasy.com */
public class ResultSetMetaDataColumnDatatype {
public static void main(String... arg) {
     Connection con = null;
     PreparedStatement prepStmt = null;
     ResultSet rs = null;             
     try {
          // registering Oracle driver class
          Class.forName("oracle.jdbc.driver.OracleDriver");
          // getting connection
          con = DriverManager.getConnection(
                   "jdbc:oracle:thin:@localhost:1521:orcl",
                   "ankit", "Oracle123");
         
          prepStmt = con.prepareStatement("select * from EMPLOYEE");
          //Obtain ResultSet
          rs = prepStmt.executeQuery();
         
          //Obtain ResultSetMetaData
          ResultSetMetaData rsmd = rs.getMetaData();
          int totalNumberOfColumnsInTable = rsmd.getColumnCount();
          System.out.println("\nTotal number of columns in table = "
                   + totalNumberOfColumnsInTable);
         
          for(int i=1; i<=totalNumberOfColumnsInTable; i++){
             
              System.out.println("\n"+rsmd.getColumnTypeName(i));
             
              if(rsmd.getColumnTypeName(i).equals("NUMBER")){
                   System.out.println("Column's datatype is NUMBER" );
              }
              else if(rsmd.getColumnTypeName(i).equals("VARCHAR2")){
                   System.out.println("Column's datatype is VARCHAR2" );
              }
              else if(rsmd.getColumnTypeName(i).equals("DATE")){
                   System.out.println("Column's datatype is DATE" );
              }
              else if(rsmd.getColumnTypeName(i).equals("CLOB")){
                   System.out.println("Column's datatype is CLOB" );
              }
              else if(rsmd.getColumnTypeName(i).equals("BLOB")){
                   System.out.println("Column's datatype is BLOB" );
              }
          }
         
         
     } catch (ClassNotFoundException e) {
          e.printStackTrace();
     } catch (SQLException e) {
          e.printStackTrace();
     }
     finally{
          try {
              if(rs!=null) rs.close(); //close resultSet
              if(prepStmt!=null) prepStmt.close(); //close PreparedStatement
              if(con!=null) con.close(); // close connection
          } catch (SQLException e) {
              e.printStackTrace();
          }
     }
}
}
/*OUTPUT
Total number of columns in table = 5
NUMBER
Column's datatype is NUMBER
VARCHAR2
Column's datatype is VARCHAR2
DATE
Column's datatype is DATE
CLOB
Column's datatype is CLOB
BLOB
Column's datatype is BLOB
*/



Related >

Primitive, Custom/reference Data Types, Integer, Floating-Point, Character and String literal, Escape sequence in java, decimal to hexaDecimal and binary conversion program


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