我正在从我的 derby 数据库中创建一个数组列表，如下所示：
public ArrayList<ArrayList<String>> createArray(String ticket, JLabel message){
String sl = ticket;
List rowData ;
List<String> columnHeaders;
ArrayList<ArrayList<String>> tableData = null;
try{
conn= new data.connection().db();
String query="SELECT * FROM SERVICE_TICKET WHERE TICKET_NO ='"+sl+"' ";
stmtt = conn.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_READ_ONLY);
rs = stmtt.executeQuery(query);
md = rs.getMetaData();
int count = md.getColumnCount();
columnHeaders = new ArrayList<>();
tableData = new ArrayList<>();
/*
for (int i = 1; i <= count; i++) {
columnHeaders.add(md.getColumnName(i));
System.out.print(columnHeaders);
}
*/
while (rs.next()) {
rowData = new ArrayList<>();
for (int i = 2; i <= count; i++) {
rowData.add(rs.getObject(i));
message.setText(rs.getObject(i).toString());
}
tableData.add((ArrayList<String>) rowData);
}
System.out.println(tableData);
}
catch (SQLException ex) {
JOptionPane.showMessageDialog(null, "Unknown Error!! Data cannot be displayed!"+ex);
}
finally{try{stmtt.close(); conn.close(); rs.close();} catch(SQLException ex){}}
return tableData;
}
并尝试将数据插入到远程 MySQL 数据库中，如下所示：
public void save(String ticket, JLabel message){
ArrayList<ArrayList<String>> tableData = createArray(ticket, message);
String query = "INSERT INTO SERVICE_TICKET(ID, TICKET_NO, " // VARCHAR(40),
+" SL_NO, " //INTEGER,
+" CODE, " // VARCHAR(30),
+" ITEM_NAME, " // VARCHAR(300),
+" GROUP_NAME, " // VARCHAR(50),
+" QNTY, " // INTEGER,
+" UNIT, " // VARCHAR(30),
+" TAXABLE, " // VARCHAR(3),
+" BONUSABLE, " // VARCHAR(3),
+" PRICE, " // DECIMAL(30 , 2),
+" AMOUNT, "// DECIMAL(30, 2) DEFAULT 0.00,
+" DISC_PERCENTAGE, " // DECIMAL(30, 2) DEFAULT 0.00,
+" DISCOUNT, " // DECIMAL(30, 2) DEFAULT 0.00,
+" FEDERAL, " // DECIMAL(30, 2) DEFAULT 0.00,
+" GST, " // DECIMAL(30, 2) DEFAULT 0.00,
+" TOTAL_TAX, " // DECIMAL(30, 2) DEFAULT 0.00,
+" NET_AMOUNT) " // DECIMAL(30 , 2)
+" VALUES(?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)" ;
try{
Class.forName("java.sql.Driver");
conn = DriverManager.getConnection("jdbc:mysql://www.example.com:3306/myDatabase", "user_1", "password_123");
conn.setAutoCommit(false);
stmt = conn.prepareStatement(query);
if(conn != null ){
JOptionPane.showMessageDialog(null, "Connected to Internet....");}
else{JOptionPane.showMessageDialog(null, "Failed to connect to the server");}
for(int i = 0; i<tableData.size(); i++){
ArrayList<String> innerList = (ArrayList<String>)tableData.get(i);
for(int j = 0; j<innerList.size(); j++){
stmt.setString(1, innerList.get(j).toString()) ; // TICKET_NO VARCHAR(40),
stmt.setInt(2, Integer.parseInt(innerList.get(j).toString())) ; //SL_NO INTEGER,
stmt.setString(3, innerList.get(j).toString()) ; //CODE VARCHAR(30),
stmt.setString(4, innerList.get(j).toString()) ; //ITEM_NAME VARCHAR(300),
stmt.setString(5, innerList.get(j).toString()) ; // GROUP_NAME VARCHAR(50),
stmt.setInt(6, Integer.parseInt(innerList.get(j).toString())) ; // QNTY INTEGER,
stmt.setString(7, innerList.get(j).toString()) ; // UNIT VARCHAR(30),
stmt.setString(8, innerList.get(j).toString()) ; // TAXABLE VARCHAR(3),
stmt.setString(9, innerList.get(j).toString()) ; // BONUSABLE VARCHAR(3),
stmt.setDouble(10, Double.parseDouble(innerList.get(j).toString())) ; // PRICE DECIMAL(30 , 2),
stmt.setDouble(11, Double.parseDouble(innerList.get(j).toString())) ; // AMOUNT DECIMAL(30, 2) DEFAULT 0.00,
stmt.setDouble(12, Double.parseDouble(innerList.get(j).toString())) ; // DISC_PERCENTAGE DECIMAL(30, 2) DEFAULT 0.00,
stmt.setDouble(13, Double.parseDouble(innerList.get(j).toString())) ; // DISCOUNT DECIMAL(30, 2) DEFAULT 0.00,
stmt.setDouble(14, Double.parseDouble(innerList.get(j).toString())) ; // FEDERAL DECIMAL(30, 2) DEFAULT 0.00,
stmt.setDouble(15, Double.parseDouble(innerList.get(j).toString())) ; // GST DECIMAL(30, 2) DEFAULT 0.00,
stmt.setDouble(16, Double.parseDouble(innerList.get(j).toString())) ; // TOTAL_TAX DECIMAL(30, 2) DEFAULT 0.00,
stmt.setDouble(17, Double.parseDouble(innerList.get(j).toString())) ; // NET_AMOUNT DECIMAL(30 , 2)
stmt.addBatch();
stmt.executeBatch();
conn.commit();
}}
JOptionPane.showMessageDialog(null, "Data saved successfully.");
}
catch(SQLException | ClassNotFoundException ex){JOptionPane.showMessageDialog(null, "Cannot Save"+ex);}
finally{
try{
stmt.close(); conn.close(); conn.setAutoCommit(true);
}catch(SQLException ex){}
}
}
数组列表在控制台中显示良好。但它总是给我 NumberFormatException ......我的代码有什么问题？
还有一个问题：还有其他选择，我可以将我的表数据从本地计算机（在 Derby 数据库中运行）插入到远程 MySQL 数据库吗？请帮忙。