[英]Retrieve data from MySQL in Java (After end of result set error)
[英]How to retrieve result set of a query from MySQL in java
我已經連接到我的數據庫:
Connection con = DriverManager.getConnection(
"jdbc:mysql://instance23389.db.xeround.com:15296/Inventory","user","password");
PreparedStatement Statement = con.prepareStatement("Select * from inventory");
ResultSet result = Statement.executeQuery();
while(result.next()) {
//What to put here?
}
這是我想要存儲在該數據庫中的arraylist:
static ArrayList<Product> Chart=new ArrayList<Product>();
並且這些對象存儲在arraylist中:
double Total;
String name;
double quantity;
String unit;
double ProductPrice;
我需要使用什么通用代碼來將arraylist存儲在MySQL數據庫中? 我需要使用什么通用代碼才能將arraylist從MySQL數據庫中刪除?
這是用於檢索和填充Arraylist productList
while (result.next()) {
Product product = new Product();
product.setTotal(result.getDouble("Total"));
product.setName(result.getString("Name"));
// etc.
productList.add(product);
}
在此期間,我邀請您來看看:
你的問題不是很清楚,但我猜你想要的東西是這樣的:
List<Product> products = new ArrayList<Product>();
String host = "instance23389.db.xeround.com";
int port = 15296;
String dbName = "Inventory";
String url = "jdbc:mysql://" + host + ":" + port + "/" + dbName;
Connection con = null;
PreparedStatement stmt = null;
try {
con = DriverManager.getConnection(url, "user","password");
stmt = con.prepareStatement("select * from inventory");
ResultSet result = stmt.executeQuery();
while(result.next()) {
Product prod = new Product();
prod.setTotal(result.getDouble("total"));
prod.setName(result.getString("name"));
prod.setQuantity(result.getDouble("quantity"));
prod.setUnit(result.getString("unit"));
prod.setProductPrice(result.getDouble("product_price"));
products.add(prod);
}
} finally {
if (stmt != null) {
try {
stmt.close();
} catch (SQLException ex) {
}
}
if (con != null) {
try {
con.close();
} catch (SQLException ex) {
}
}
}
return products;
如果要插入,則選擇不是方法。 你需要的是什么
Statement statement = conn.createStatement();
statement.executeUpdate("INSERT INTO Customers " + "VALUES (1001, 'Simpson', 'Mr.', 'Springfield', 2001)");
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