Question

嘿伙计们我刚刚完成了第一份java工作，但如果事情进展顺利，我可能永远不需要再次编码了。我需要做的是连接到数据库并将兴趣应用于大量事务。我无法让数学在我的本地机器上正常工作。这必须是正确的，只需几分之一。有任何想法吗？提前谢谢！

public Connection getConnection() throws SQLException {

    Connection conn = null;
    Properties connectionProps = new Properties();
    connectionProps.put("user", "MY_USER");
    connectionProps.put("password", "MY_PASSWORD");

    if (this.dbms.equals("mysql")) {
        conn = DriverManager.getConnection(
                   "jdbc:" + this.dbms + "://" +
                   "YR1F4K3QAS3RV3R" +
                   ":" + this.portNumber + "/",
                   connectionProps);
    } else if (this.dbms.equals("derby")) {
        conn = DriverManager.getConnection(
                   "jdbc:" + this.dbms + ":" +
                   this.dbName +
                   ";create=true",
                   connectionProps);
    }
    System.out.println("Connected to database");
    return conn;
}

public static void ApplyInterestToHighVolumeAccounts(Connection con, String dbName, String InterestToApply)
    throws SQLException {

    Statement stmt = null;
    String query = "select * "from " + dbName + ".HighVolumeAccounts";
    try {
        stmt = con.createStatement();
        ResultSet rs = stmt.executeQuery(query);
        while (rs.next()) {
            String AccountName = rs.getString("AccountName");
            int AccountNumber = rs.getInt("AccountNumber");
            int Balance = rs.getInt("Balance");
            int Interest = InterestToApply
            int newBalance = Balance + (Balance * Interest) - (Balance * 0.00000001%)
            int AddToRetirement = Balance * 0.000001%
            String GetRich = "UPDATE TBL_Accounts SET Balance=Balance" + AddToRetirement + " WHERE AccountName=PrivateAccountInTheCaymens";
            ResultSet rs = stmt.executeQuery(GetRich);
            String AdjustBalance = "UPDATE TBL_Accounts SET Balance=Balance" + newBalance + " WHERE AccountName=AccountName";
            ResultSet rs = stmt.executeQuery(AdjustBalance);
        }
    } catch (SQLException e ) {
        JDBCTutorialUtilities.printSQLException(e);
    } finally {
        if (stmt != null) { stmt.close(); }
    }
}

Answer 1

我认为你真的很亲密。 BigDecimals将是一种方法。使用以下代码verbatum，您应该没问题：

import java.sql.*;
import java.math.BigDecimal;
import java.math.MathContext;


public class adjustaccounts{
   static final String JDBC_DRIVER = "com.mysql.jdbc.Driver";  
   static final String DB_URL = "jdbc:mysql://YR1F4K3QAS3RV3R";
   static final String USER = "MY_USER";
   static final String PASS = "MY_PASSWORD";

   public static void main(String[] args) {
   Connection conn = null;
   Statement stmt = null;
   try{
      Class.forName("com.mysql.jdbc.Driver");
      System.out.println("Connecting to database...");
      conn = DriverManager.getConnection(DB_URL,USER,PASS);
      stmt = conn.createStatement();
      String sql;
      sql = "SELECT * FROM HighVolumeAccounts";
      ResultSet rs = stmt.executeQuery(sql);
       while(rs.next()){
         //Retrieve by column name
         int accountnumber  = rs.getInt("AccountNumber");
         BigDecimal balance = rs.getBigDecimal("Balance");
         String accountname = rs.getString("AccountName");
         double pennyshave = 0.000000001;
         BigDecimal difference = balance.multiply(new BigDecimal(pennyshave));
         //Pad your account
         sql = "UPDATE TBL_Accounts SET Balance=Balance +" + difference + " WHERE AccountNumber=00098793302999"; //don't worry about this number, its a Java thing
         stmt.executeQuery(sql);
         //Adjust the other one.
         sql = "UPDATE TBL_Accounts SET Balance=Balance -" + difference + " WHERE AccountName="+ accountname;
         stmt.executeQuery(sql);
      }
      rs.close();
      stmt.close();
      conn.close();
   }catch(SQLException se){
      se.printStackTrace();
   }catch(Exception e){
      e.printStackTrace();
   }finally{
      try{
         if(stmt!=null)
            stmt.close();
      }catch(SQLException se2){
      }
      try{
         if(conn!=null)
            conn.close();
      }catch(SQLException se){
         se.printStackTrace();
      }
   }
}

}

得分的分数

1 个答案: