how to use multiple queries in java using jdbc - jdbc

Question

how to use multiple queries in java using jdbc
1.how to use this below query in the method without deleting the already existing query in
method
Insert into item_details(stock_name,temple,quantity)
SELECT a.stock_name, a.temple, SUM(Case when Type='purchase' then quantity else
(quantity*-1) End) AS quantity
FROM purchase_details a
GROUP BY a.stock_name, a.temple
public boolean insertIntimationDetails(StockForm ofform) {
boolean status=false;
PreparedStatement pst=null;
Connection conn=null;
try {
System.out.println("Inside insertIntimationDetails ");
String query=" update purchase_details set intimation_quantity = ? where
temple=? and Stock_name=? ";
System.out.println(query);
conn=getConnection();
System.out.println(query);
pst=conn.prepareStatement(query);
System.out.println(ofform.getIntimationQuantity());
pst.setString(2, ofform.getForTemple());
pst.setString(3, ofform.getStockName());
pst.setLong(1, ofform.getIntimationQuantity());
int rows= pst.executeUpdate();
if(rows>0){
status=true;
}
} catch (Exception e) {
e.printStackTrace();
} finally{
try {
if(pst!=null)
pst.close();
if(conn!=null)
conn.close();
} catch (Exception e2) {
e2.printStackTrace();
}
}
return status;
}

Answer 1

You can make the two SQLs atomic by using something similar to below code. This guarantees all or nothing rule.
public boolean insertIntimationDetails(StockForm ofform) {
boolean status = false;
PreparedStatement pst = null;
Connection conn = null;
Statement stat = null;
try {
System.out.println("Inside insertIntimationDetails ");
String query = " update purchase_details set intimation_quantity = ? where temple=? and Stock_name=? ";
System.out.println(query);
conn = getConnection();
conn.setAutoCommit(false); // Disable Auto Commit
System.out.println(query);
pst = conn.prepareStatement(query);
System.out.println(ofform.getIntimationQuantity());
pst.setString(2, ofform.getForTemple());
pst.setString(3, ofform.getStockName());
pst.setLong(1, ofform.getIntimationQuantity());
int rows = pst.executeUpdate();
if (rows > 0) {
status = true;
}
stat = conn.createStatement();
boolean status2 = stat
.execute("Insert into item_details(stock_name,temple,quantity) SELECT a.stock_name, a.temple, SUM(Case when Type='purchase' then quantity else (quantity*-1) End) AS quantity FROM purchase_details a GROUP BY a.stock_name, a.temple");
if (status && status2) {
conn.commit();
} else {
conn.rollback();
}
} catch (Exception e) {
e.printStackTrace();
conn.rollback();
} finally {
try {
if (pst != null)
pst.close();
if (stat != null)
stat.close();
if (conn != null)
conn.close();
} catch (Exception e2) {
e2.printStackTrace();
}
}
return status;
}