准备语句、结果集和查询问题

Question

下面的方法应该从 jsp 页面获取两个用户输入 "low and "high"，并使用它们来获取价格介于 "low" 和 "high".

我在 tomcat-log 中看到的一个错误是：

MySQLSyntaxErrorException：您的 SQL 语法有误；检查与您的 MariaDB 服务器版本相对应的手册，以获取正确的语法在第 1 行

附近使用 'BETWEEN 100000.0 and 300000.0'

100000.0 和 300000.0 是我输入的输入。

public static ArrayList<Property> search(double low, double high) {
ConnectionPool pool = ConnectionPool.getInstance();
Connection connection = pool.getConnection();
PreparedStatement ps = null;
ResultSet rs = null;

    String query = "select * from properties"
        + "WHERE price BETWEEN ? and ?";

    try {
        ps = connection.prepareStatement(query);
        ps.setDouble(1, low);  //this should set user input = ?
        ps.setDouble(2, high); //this should set user input = ?
        rs = ps.executeQuery();

        ArrayList<Property> list = new ArrayList<>();

        while (rs.next()) {     
            Property p = new Property();    
            p.setName(rs.getString("name"));
            p.setPrice(rs.getDouble("price"));
            list.add(p);
        }       
        return list;
    } catch (SQLException e) {
        System.out.println(e);
        return null;
    } finally {
        DBUtil.closeResultSet(rs);
        DBUtil.closePreparedStatement(ps);
        pool.freeConnection(connection);
    }

}

Answer 1

您的查询中缺少 space

String query = "select * from properties"
    + " WHERE price BETWEEN ? and ?";

按照你的意思，这个词会变成 propertiesWHERE

准备语句、结果集和查询问题

preparedstatement, resultset, and query issue

java

jdbc

resultset

prepared-statement