This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
Almost everyone prefer PreparedStatement over Statement most of the time. Prepared Statement is given an SQL statement when it is created so the SQL statement is sent to the DBMS where it is pre-compiled. So next time you execute the same prepared statement DBMS shouldn't need to compile it but run it directly.
Eventhough PreparedStatement has this advantage of avoiding compilation of query in DB, if you close the connection once you are done with executing the query then both Statement and PreparedStatement are same.
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
A Statement will always proceed through the four steps above for each SQL query sent to the database. A PreparedStatement pre-executes steps (1) - (3) in the execution process above. Thus, when creating a PreparedStatement some pre-optimization is performed immediately. The effect is to lessen the load on the database engine at execution time.
Kumaresh Vidhyasagar wrote:Eventhough PreparedStatement has this advantage of avoiding compilation of query in DB, if you close the connection once you are done with executing the query then both Statement and PreparedStatement are same.
1.if i call preparedStatement.close(); will the Statement and PreparedStatement are same?
2.if i use a connection pool which has 10 connections, a application use connection1 for creating a preparedStatement, another
application user connection2 for creating a same preparedStatement ,will the 2nd application compile the sql ? or will it use the 1st prepared one?