Ebean/idIn参数未设置

Question

我对Ebean有一个奇怪的问题。

代码：

static <T> ImmutableMap<Long, T> getFromIdToItemMap(Iterable<SqlRow> rows, 
     Callable<Model.Finder<Long, T>> getFinder, 
     String idSqlFieldName, 
     Function<T, Long> getId) { 
    List<Long> tfzIds = Lists.newArrayList(); 
    for (SqlRow i : rows) { 
     tfzIds.add((long) i.getLong(idSqlFieldName)); 
    } 
    Builder<Long, T> id_to_tfz = new ImmutableMap.Builder<Long, T>(); 
    List<T> tfzs; 
    try { 
     tfzs = getFinder.call().where().idIn(tfzIds).findList(); 
    } catch (Exception e) { 
     throw new RuntimeException(e); 
    } 
    for (T tfz : tfzs) { 
     id_to_tfz.put(getId.apply(tfz), tfz); 
    } 
    return id_to_tfz.build(); 
} 

例外：

javax.persistence.PersistenceException: Query threw SQLException:Parameter "#1" is not set; SQL statement: 
select t0.virtuelle_adresse c0, t0.reale_adresse c1, t0.betr_nr c2, t0.bemerkung c3, t0.inbetriebnahme c4, t0.dekoder_typ_id c5, t0.model_tfz_typ_id c6, t0.eigentuemer_id c7 
from tfz t0 
where t0.virtuelle_adresse in (?) [90012-168] 
Bind values:[] 
Query was: 
select t0.virtuelle_adresse c0, t0.reale_adresse c1, t0.betr_nr c2, t0.bemerkung c3, t0.inbetriebnahme c4, t0.dekoder_typ_id c5, t0.model_tfz_typ_id c6, t0.eigentuemer_id c7 
from tfz t0 
where t0.virtuelle_adresse in (?) 


    at com.avaje.ebeaninternal.server.query.CQuery.createPersistenceException(CQuery.java:815) 
    at com.avaje.ebeaninternal.server.query.CQuery.createPersistenceException(CQuery.java:795) 
    at com.avaje.ebeaninternal.server.query.CQueryEngine.findMany(CQueryEngine.java:210) 
    at com.avaje.ebeaninternal.server.query.DefaultOrmQueryEngine.findMany(DefaultOrmQueryEngine.java:77) 
    at com.avaje.ebeaninternal.server.core.OrmQueryRequest.findList(OrmQueryRequest.java:272) 
    at com.avaje.ebeaninternal.server.core.DefaultServer.findList(DefaultServer.java:1502) 
    at com.avaje.ebeaninternal.server.querydefn.DefaultOrmQuery.findList(DefaultOrmQuery.java:904) 
    at com.avaje.ebeaninternal.util.DefaultExpressionList.findList(DefaultExpressionList.java:177) 
    at controllers.Prognosis.getFromIdToItemMap(Prognosis.java:106) 
    ... 26 more 
Caused by: org.h2.jdbc.JdbcSQLException: Parameter "#1" is not set; SQL statement: 
select t0.virtuelle_adresse c0, t0.reale_adresse c1, t0.betr_nr c2, t0.bemerkung c3, t0.inbetriebnahme c4, t0.dekoder_typ_id c5, t0.model_tfz_typ_id c6, t0.eigentuemer_id c7 
from tfz t0 
where t0.virtuelle_adresse in (?) [90012-168] 
    at org.h2.message.DbException.getJdbcSQLException(DbException.java:329) 
    at org.h2.message.DbException.get(DbException.java:169) 
    at org.h2.message.DbException.get(DbException.java:146) 
    at org.h2.expression.Parameter.checkSet(Parameter.java:73) 
    at org.h2.command.Prepared.checkParameters(Prepared.java:163) 
    at org.h2.command.CommandContainer.query(CommandContainer.java:85) 
    at org.h2.command.Command.executeQuery(Command.java:191) 
    at org.h2.jdbc.JdbcPreparedStatement.executeQuery(JdbcPreparedStatement.java:109) 
    at com.jolbox.bonecp.PreparedStatementHandle.executeQuery(PreparedStatementHandle.java:172) 
    at com.avaje.ebeaninternal.server.query.CQuery.prepareBindExecuteQuery(CQuery.java:382) 
    at com.avaje.ebeaninternal.server.query.CQueryEngine.findMany(CQueryEngine.java:174) 
    ... 32 more 

我不明白是怎么tfzIds名单没有得到插入到EBean建查询。

我试过了：我把演员加了很长时间以确保我不会在列表中找到空位。但是，这似乎并不是问题，看起来这份清单并没有被读取。

Answer 1

发生异常是因为rows是空的......我很惊讶EBean没有检查。我通过声明行hasNext()作为该方法的第一个声明来解决该问题，从而激发了更有用的异常。