Question

如何在java中使用jdbc

使用多个查询

1.如何在方法中使用以下查询而不删除
中已存在的查询方法

插入item_details（stock_name，temple，quantity）选择a.stock_name，a.temple，SUM（Type ='purchase'时的情况，然后是数量。）（数量* -1）结束）AS数量来自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

您可以使用类似于以下代码的内容使两个SQL成为原子。这保证了全部或全部规则。

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;

}

如何在java中使用jdbc使用多个查询

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