Hibernate createSQLQuery 给出异常 - 字符串索引超出范围：0答案

【问题标题】：Hibernate createSQLQuery giving exception - String index out of range: 0Hibernate createSQLQuery 给出异常 - 字符串索引超出范围：0
【发布时间】：2017-11-08 17:24:44
【问题描述】：

对于下面提到的逻辑实现get exception (java.lang.StringIndexOutOfBoundsException: String index out of range: 0) at line : result = q.list();

我确定在许多地方性别为空。查询时还有其他方法可以检查 null 吗？

 beginTransaction();
        try {
            SQLQuery q = getSession().createSQLQuery("SELECT DISTINCT " +
                                                     "ind.ind_id AS id, " +
                                                     "ind.IND_FNAME AS firstName, " +
                                                     "ind.IND_LNAME AS lastName, " +
                                                     "perInfo.IND_DOB AS dob, " +
                                                     "trc.trCTM_Grade_Mapping AS grade, " +
                                                     "TIMESTAMPDIFF(YEAR, perInfo.IND_DOB, NOW()) AS years, " +
                                                     "TIMESTAMPDIFF(MONTH, perInfo.IND_DOB, NOW())  AS months, " +
                                                     "perInfo.IND_SEX AS sex " +
                                                         "FROM INDIVIDUALS ind " +
                                                             "INNER JOIN USER_MEMBERSHIPS usm on usm.USR_ID = ind.IND_ID " +
                                                             "INNER JOIN PERSONAL_INFO perInfo on perInfo.IND_ID = ind.IND_ID " +
                                                             "INNER JOIN TRACKER_CUSTOM_DASHBOARD trcd on perInfo.IND_ID = trcd.USR_ID  " +
                                                             "INNER JOIN TRACKER_CUSTOM trc on trcd.trCTM_MainID = trc.trCTM_MainID " +
                                                         "WHERE usm.GRP_ID = :GRP_ID ;");


            q.setInteger ("GRP_ID", groupId);
            q.setResultTransformer (Transformers.aliasToBean (ImmunizationsComplianceDTO.class));
            result = q.list();
        }catch(RuntimeException e) {
            rollbackTransaction();
            handleHibernateException(e);
            throw e;
        } finally {
            closeTransaction();
        }

【问题讨论】：

标签： hibernate

【解决方案1】：

在 ImmunizationsComplianceDTO 中，我确实进行了以下更改。仍然没有运气遇到同样的问题......

不是简单地添加getter和setter，而是添加了对性别的空检查

 if(gender != null){
                this.sex = gender;
            }

完整的getter setter如下所示。

// Getter setter for gender of the student.
    public Character getSex() {
        return sex;
    }
    public void setSex(Character gender) {
        if(gender != null){
            this.sex = gender;
        }
    }

【讨论】：

【解决方案2】：

所以看起来性别/性别列有空值，为了克服这个问题，在查询中添加了以下内容

"COALESCE(perInfo.IND_SEX, '') AS sex" +

所以最终的查询看起来像

beginTransaction();
        try {
            SQLQuery q = getSession().createSQLQuery("SELECT DISTINCT " +
                                                     "ind.ind_id AS id, " +
                                                     "ind.IND_FNAME AS firstName, " +
                                                     "ind.IND_LNAME AS lastName, " +
                                                     "perInfo.IND_DOB AS dob, " +
                                                     "trc.trCTM_Grade_Mapping AS grade, " +
                                                     "TIMESTAMPDIFF(YEAR, perInfo.IND_DOB, NOW()) AS years, " +
                                                     "TIMESTAMPDIFF(MONTH, perInfo.IND_DOB, NOW())  AS months, " +
                             "COALESCE(perInfo.IND_SEX, '') AS gender" + 
                                                         "FROM INDIVIDUALS ind " +
                                                             "INNER JOIN USER_MEMBERSHIPS usm on usm.USR_ID = ind.IND_ID " +
                                                             "INNER JOIN PERSONAL_INFO perInfo on perInfo.IND_ID = ind.IND_ID " +
                                                             "INNER JOIN TRACKER_CUSTOM_DASHBOARD trcd on perInfo.IND_ID = trcd.USR_ID  " +
                                                             "INNER JOIN TRACKER_CUSTOM trc on trcd.trCTM_MainID = trc.trCTM_MainID " +
                                                         "WHERE usm.GRP_ID = :GRP_ID ;");


            q.setInteger ("GRP_ID", groupId);
            q.setResultTransformer (Transformers.aliasToBean (ImmunizationsComplianceDTO.class));
            result = q.list();
        }catch(RuntimeException e) {
            rollbackTransaction();
            handleHibernateException(e);
            throw e;
        } finally {
            closeTransaction();
        }

【讨论】：