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In 5, we built a DemoPreparedStatementQuery class to fetch employee details given an employee number, using a PreparedStatement object. The relevant portion of the class is reproduced here: try { pstmt = conn.prepareStatement( stmtString ); // bind the values pstmt.setString(JOB_COLUMN_INDEX, "CLERK" ); pstmt.setDate(HIREDATE_COLUMN_INDEX, new java.sql.Date( new java.util.Date().getTime())); // execute the query rset = pstmt.executeQuery(); // print the result System.out.println( "printing query results ...\n"); while (rset.next()) { int empNo = rset.getInt ( SELECT_CLAUSE_EMPNO_COLUMN_INDEX ); String empName = rset.getString ( SELECT_CLAUSE_ENAME_COLUMN_INDEX ); String empJob = rset.getString ( SELECT_CLAUSE_JOB_COLUMN_INDEX ); System.out.println( empNo + " " + empName + " " + empJob ); } } finally { // release JDBC related resources in the finally clause. JDBCUtil.close( rset ); JDBCUtil.close( pstmt ); } Another way to achieve the same objective is to use CallableStatement (or OracleCallableStatement). We covered how to do this in the class DemoCallableStatement, the relevant portion of which is reproduced here: try { // The function invoked below has a signature of: // function get_emp_details_func( p_empno in number ) // return sys_refcursor // formulate a CallableStatement string using Oracle-style // syntax String oracleStyle = "begin := callable_stmt_demo.get_emp_details_func( ); end;"; // create the CallableStatement object

Oracle can often access the same data through different paths. For each query, the optimizer evaluates all the available paths and picks the least expensive one in terms of resource usage. The following sections present a summary of the common access methods available to the optimizer. If joins are involved, then the join order and the join method are evaluated to finally arrive at the best execution plan. You ll take a brief look at the steps the optimizer goes through before deciding on its choice of execution path.

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Oracle scans the entire table during a full table scan. Oracle reads each block in the table sequentially, so the full table scan can be efficient if the database uses a high default value internally for the DB_FILE_MULTIBLOCK_READ_COUNT initialization parameter. The parameter determines the maximum number of blocks the database reads during a sequential scan. However, for large tables, full table scans are inefficient in general.

Accessing a table by ROWID retrieves rows using unique ROWIDs. ROWIDs in Oracle specify the exact location in the datafile and the data block where the row resides, so ROWID access is the fastest way to retrieve a row in Oracle. Often, Oracle obtains the ROWID through an index scan of the table s indexes. Using these ROWIDs, Oracle swiftly fetches the rows.

cstmt = connprepareCall( oracleStyle ); // bind the input value cstmtsetInt(2, inputEmpNo ); // register the output value cstmtregisterOutParameter( 1, OracleTypesCURSOR ); // execute the query cstmtexecute(); rset = (ResultSet) cstmtgetObject( 1 ); // print the result while (rsetnext()) { int empNo = rsetgetInt ( 1 ); String empName = rsetgetString ( 2 ); String empJob = rsetgetString ( 3 ); Systemoutprintln( empNo + " " + empName + " " + empJob ); } } .. In this case, we wrap our select statement in a packaged function and invoke it from Java.

An index stores two things: the column value of the column on which the index is based and the ROWID of the rows in the table that contain that column value. An index scan retrieves data from an index using the values of the index columns. If the query requests only the indexed column values, Oracle will return those values. If the query requests other columns outside the indexed column, Oracle will use the ROWIDs to get the rows of the table.

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