Question

我必须从数据库向jComboBox添加项目。我使用Netbeans并且不知道jComboBox在哪个事件中添加项目方法应该放置。

Answer 1

我不确定我是否完全理解你的问题，但我认为你想要这样的事情：

String[] petStrings = { "Bird", "Cat", "Dog", "Rabbit", "Pig" };
JComboBox box = new JComboBox(petStrings);
....
box.addItem("Mouse");

这会给你一个大概的想法......

这是一个示例函数，我用它来查询SELECT语句并获取结果集并返回一个字符串Vector：

// Function to search the DB and return a vector containing the search
// results. The passed in value is a String used in a LIKE SQL search.
public Vector<String> Search(String query, int cid){
    Vector<String> retVal = new Vector<String>();

    try {
        // A SQL statement
        Statement st = DBObject.conn.createStatement();

        // Get result set.
        ResultSet r = st.executeQuery("SELECT filename FROM " +
                "[P2P].[dbo].[FILE] WHERE filename LIKE '" + query + "' " +
                "AND shared=1 AND client_ID!=" + cid + ";");

        // Iterate through the results.
        while(r.next()){
            retVal.add(r.getString("filename"));
        }
    } catch (SQLException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

    return retVal;
}

DBObject类：

abstract public class DBObject {
static Connection conn;
boolean valid;

// This tells us if we can use the object.
public boolean isValid() { return valid; }
}

如何连接到数据库：

// Set the connection string.
connectString = "jdbc:sqlserver://" + args[0] + ";user=P2P;password=1234;";

如何将项目添加到jcombobox中

1 个答案: