如何在jdbc中按ID搜索

Question

我在我的代码jdbc中使用编写了以下代码来搜索ID：

public Item findById(String id) {
        Item result = null;

        String s = "SELECT id, key, name, creat, description FROM trackersql WHERE id = :id";

        try (Connection connection = init()) {
            PreparedStatement statement = connection.prepareStatement(s);

            ResultSet resultSet = statement.executeQuery();

            while(resultSet.next()) {
                Item item = new Item();

                statement.setString(1, id);
                statement.setString(2, item.getKey());
                statement.setString(3, item.getName());
                statement.setLong(4, item.getCreat());
                statement.setString(5, item.getDescription());
                statement.executeUpdate();
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }

        return result;
    }

以这种方式检查我的代码：

try {
            DriverManager.registerDriver(new org.postgresql.Driver());
        } catch (SQLException e) {
            e.printStackTrace();
        }
        TrackerSQL trackerSQL = new TrackerSQL();
        Item item1 = new Item("1", "1", "test1", 1, "test1");

        trackerSQL.init();

        System.out.println(trackerSQL.findById(item1.getId()));

但出现以下错误：

错误：语法错误（大约位置：“：”）位置：第69位org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse（QueryExecutorImpl.java:2103）在org.postgresql.core.v3.QueryExecutorImpl.processResults（QueryExecutorImpl.java:1836）在org.postgresql.core.v3.QueryExecutorImpl.execute（QueryExecutorImpl.java:257）在org.postgresql.jdbc2.AbstractJdbc2Statement.execute（AbstractJdbc2Statement.java:512）在org.postgresql.jdbc2.AbstractJdbc2Statement.executeWithFlags（AbstractJdbc2Statement.java:388）在org.postgresql.jdbc2.AbstractJdbc2Statement.executeQuery（AbstractJdbc2Statement.java:273）在ru.job4j.trackersql2.TrackerSQL.findById（TrackerSQL.java:104）在ru.job4j.trackersql2.TrackerSQL.main（TrackerSQL.java:188）null

我的错误是什么？

Answer 1

JDBC不知道命名参数。用:id代替?。你也永远不会绑定参数

String s = "SELECT id, key, name, creat, description FROM trackersql WHERE id = :id";
try (Connection connection = init()) {
    PreparedStatement statement = connection.prepareStatement(s);
    statement.setString(1,id)
    ResultSet resultSet = statement.executeQuery();