differce B/W statement and preparestatement

[kaatamraju]

hi
i am kaatamraju.i wouldlike to know diff.B/W statement and preparestatement ,if antone know please send me
bye.

[Servepreet]

Short answer:
1. The PreparedStatement is a slightly more powerful version of a Statement, and should always be at least as quick and easy to handle as a Statement.
2. The PreparedStatement may be parametrized.

Longer answer: Most relational databases handles a JDBC / SQL query in four steps:
1. Parse the incoming SQL query
2. Compile the SQL query
3. Plan/optimize the data acquisition path
4. Execute the optimized query / acquire and return data

Code samples
Statement example
// Assume a database connection, conn.
Statement stmnt = null;
ResultSet rs = null;
try
{
// Create the Statement
stmnt = conn.createStatement();

// Execute the query to obtain the ResultSet
rs = stmnt.executeQuery("select * from aTable");
}
catch(Exception ex)
{

System.err.println("Database exception: " + ex);
}


PreparedStatement example

// Assume a database connection, conn.
PreparedStatement stmnt = null;
ResultSet rs = null;
try
{
// Create the PreparedStatement
stmnt = conn.prepareStatement("select * from aTable");

// Execute the query to obtain the ResultSet
rs = stmnt.executeQuery();
}
catch(Exception ex)
{
System.err.println("Database exception: " + ex);
}


Another advantage of the PreparedStatement class is the ability to create an incomplete query and supply parameter values at execution time. This type of query is well suited for filtering queries which may differ in parameter value only:


SELECT firstName FROM employees WHERE salary > 50
SELECT firstName FROM employees WHERE salary > 200


To create a parametrized prepared statement, use the following syntax:


// Assume a database connection, conn.
PreparedStatement stmnt = null;
ResultSet rs = null;
try
{
// Create the PreparedStatement, leaving a '?'
// to indicate placement of a parameter.
stmnt = conn.prepareStatement(
"SELECT firstName FROM employees WHERE salary > ?");

// Complete the statement
stmnt.setInt(1, 200);

// Execute the query to obtain the ResultSet
rs = stmnt.executeQuery();
}
catch(Exception ex)
{
System.err.println("Database exception: " + ex);
}


Servepreet
09358104361