Get "Schema" of a table using "ResultSetMetaData"

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Get "Schema" of a table using "ResultSetMetaData"
Posted on: June 5, 2010 at 12:00 AM

In this section, schema of a table will be fetched by using 'Resultset' object and 'ResultSetMetaData' object .

GET "SCHEMA" OF A TABLE USING "RESULTSETMETADATA"

In this section, schema of a table will be fetched by using 'Resultset' object and 'ResultSetMetaData' object .

For getting column name, we will use "getColumnName()" function. This function take 'column index number' as argument , index will be fetched by using "getColumnCount()" function.
For getting maximum size of the column, we will use "getColumnDisplaySize()" function. This function take 'column index number' as argument .
For getting column's data type, we will use "getColumnTypeName()" function. This function take 'column index number' as argument.

getschema.java


import java.sql.*;

class getschema 

{

  public static void main(String[] args) 

  {

  Connection con=null;

  Statement st=null;

  ResultSet rs=null;



  try

  {

    Class.forName("com.mysql.jdbc.Driver");

    con=DriverManager.getConnection("jdbc:mysql://192.168.10.13:3306

    /ankdb","root","root");

    st = con.createStatement();

    rs = st.executeQuery("select* from Emp_sal");

  

        ResultSetMetaData metaData = rs.getMetaData();

        int rowCount = metaData.getColumnCount();



        System.out.println("Table Name : " + metaData.getTableName(2));

        System.out.println("Field  \t\t\t\tsize\t\tDataType");



     for (int i = 0; i < rowCount; i++) {

     System.out.print(metaData.getColumnName(i + 1) + " \t\t\t"); 
		

		     System.out.print(metaData.getColumnDisplaySize(i + 1) + "\t\t");

		     System.out.println(metaData.getColumnTypeName(i + 1));

                                           }

     } catch (Exception e) {

        System.out.println(e);

    }

  }

}

OUTPUT

C:\Program Files\Java\jdk1.6.0_18\bin>java getschema
Table Name : Emp_sal
Field                            size            DataType
Emp_code                   11             INTEGER
Emp_salary                  30            VARCHAR
Emp_designation          30            VARCHAR

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