dual is not mapped，select ordercode_seq_id.nextval nextvalue from dual
2013-02-19 11:57
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项目中，用到一个序列作单号，框架用的是ssh，在dao层去拿的时候，运行时报错为dual is not mapped，[select ordercode_seq_id.nextval nextvalue from dual]
后来检查发现，获取方式不对，于是改成下面这样，就可以正常获取了
Java代码
public String getOrderCode() {
try {
String sql = "select ordercode_seq_id.nextval nextvalue from dual";
Integer maxId = (Integer)(this.getSession().createSQLQuery(sql).addScalar("nextvalue", Hibernate.INTEGER) ).uniqueResult();
return maxId.toString();
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
后来检查发现，获取方式不对，于是改成下面这样，就可以正常获取了
Java代码
public String getOrderCode() {
try {
String sql = "select ordercode_seq_id.nextval nextvalue from dual";
Integer maxId = (Integer)(this.getSession().createSQLQuery(sql).addScalar("nextvalue", Hibernate.INTEGER) ).uniqueResult();
return maxId.toString();
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
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