的Java JDBC春季模板问题

Question

public List<Weather> getWeather(int cityId, int days) { 
    logger.info("days: " + days); 
    return getSimpleJdbcTemplate().query("SELECT weather.id, cities.name, weather.date, weather.degree " + 
             "FROM weather JOIN cities ON weather.city_id = cities.id " + 
             "WHERE weather.city_id = ? AND weather.date BETWEEN now()::date AND (now() + '? days')::date", 
             this.w_mapper, cityId, days); 
} 

错误：

public List<Weather> getWeather(int cityId, int days) { 
    logger.info("days: " + days); 
    return getSimpleJdbcTemplate().query("SELECT weather.id, cities.name, weather.date, weather.degree " + 
             "FROM weather JOIN cities ON weather.city_id = cities.id " + 
             "WHERE weather.city_id = ? AND weather.date = now()::date", 
             this.w_mapper, cityId); 
} 

所以使用两个时，即时通讯的问题是：

org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.springframework.dao.DataIntegrityViolationException: PreparedStatementCallback; SQL [SELECT weather.id, cities.name, weather.date, weather.degree FROM weather JOIN cities ON weather.city_id = cities.id WHERE weather.city_id = ? AND weather.date BETWEEN now()::date AND (now() + '? days')::date]; The column index is out of range: 2, number of columns: 1.; nested exception is org.postgresql.util.PSQLException: The column index is out of range: 2, number of columns: 1. 

它的工作原理？在我的查询中标记。 我如何使它与2一起工作？分数？？？

Answer 1

的问题可能是在这一部分：

'? days' 

问号是字符串里面，所以它不被SQL分析器认可。 您可以尝试使用字符串连接运算符来重写它，尽管在这种情况下我不能100％确定这是有效的语法。

根据this page on the postgres wiki您应该可以简单地省略字符串'days'，因为添加日期和整数被解释为添加指定的天数。

BETWEEN now()::date AND now()::date + ? 

Answer 2

重写SQL部分

AND weather.date BETWEEN now()::date AND (now() + '? days')::date 

作为

AND weather.date BETWEEN now()::date AND ? 

并用fullworthy java.sql.Date值设置它，而不是days。

Calendar calendar = Calendar.getInstance(); 
calendar.add(Calendar.DATE, days); 
Date endDate = new Date(calendar.getTimeInMillis()); 
// ... 

（再次，它java.sql.Date，不java.util.Date！）

Answer 3

错误是说，你只有1个参数（即？）在第一个SQL语句，但你传递有两个参数。 Spring不知道如何处理第二个参数。