'desc table name ' query

Question

Hi,
I am unable to execute query 'desc <table name>' .
This query is used to show the description of a given table specified by <table name>.
It shows me the error like 'not a SQL statement'
I am working with JSP and JDBC.
Or if you know anyother way to display table description let me know,
Waiting for reply.
Thank You.
Ketan.

Answer 1

>I am unable to execute query 'desc <table name>' .
This query is used to show the description of a given table specified by <table name>.
It shows me the error like 'not a SQL statement'
It is Most obvious Tht U wud get an Error as 'desc <table name>' is an Native SQL Query Which wud alwys b dependent on the Database.
In order to get the info U want there are two Ways to achieve it.
1).USING PROPERTIES OF ResultSetMetaData
2).USING getColums method OF DatabaseMetaData
Method 1:
=======
Statement st = con.createStatement();
ResultSet rs = st.executeQuery("SELECT * FROM EMP");
ResultSetMetaData rsmd = rs.getMetaData();
for(int i = 1 ; i <= rsmd.getColumnCount(); i ++){
System.out.println(rsmd.getColumnName(i)+"   "+rsmd.getColumnType(i));
} U may go about exploring methods of ResultSetMetaData further.
But it i personally feel the space complexity & time complexity in the following method is more.
Method 2:
========
con = DriverManager.getConnection(con_url,uname,pwd);
DataBaseMetaData dbmd = con.getMetaData();
ResultSet rs = dbmd.getColumns(null,null,TableName,null);
while(rs.next()){
System.out.println(rs.getString(3)+"   "+rs.getString(4));
// TABLE_NAME  & TABLE_TYPE
}This method enables us to get relevent info required.
One of the important things is that both of these methods are platform independent.
U may go by using either of these methods depending on your requirement.
Hop this might help u....
REGARDS,
RaHuL