JDBC 中的 setString 选择

Question

我正在尝试为 JDBC 中的语句设置字符串。但是我不知道如何为这个例子设置字符串：

public static final String SELECT_ST = "SELECT name, car FROM rating WHERE car= ?";

try (Connection connection = DriverManager.getConnection(JDBC_URL, JDBC_USER, JDBC_PASSWD);
         PreparedStatement statement1 = connection.prepareStatement(INSERT_ST);
         Statement statement2 = connection.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_UPDATABLE);
    ) {
        try(ResultSet rs = statement2.executeQuery(SELECT_ST)){

            //some code here
            
        }
    }catch (SQLException e) {
        throw new ScoreException("Some problem here", e);
    }

我如何设置字符串？在 SELECT_ST？

Answer 1

你要找的是 PreparedStatement#setString.

你的代码应该是这样的：

try (Connection connection = DriverManager.getConnection(JDBC_URL, JDBC_USER, JDBC_PASSWD);
         PreparedStatement statement1 = connection.prepareStatement(INSERT_ST);
         PreparedStatement  statement2 = connection.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_UPDATABLE);
    ) {
        statement2.setString(1, "BMW"); //Set your where condition
        try(ResultSet rs = statement2.executeQuery(SELECT_ST)){

            //some code here
            
        }
    }catch (SQLException e) {
        throw new ScoreException("Some problem here", e);
    }

不知道为什么你有 statement1 :)