从JDBC调用HSQL函数

Question

我直接从documentation

在HSQLDB 2.3.4中有以下存储过程函数

CREATE FUNCTION an_hour_before (t TIMESTAMP)
   RETURNS TIMESTAMP
   RETURN t - 1 HOUR;
/;

我尝试用

调用该函数

try (Connection connection = this.dataSource.getConnection()) {
    try (CallableStatement call = connection.prepareCall("{ ? = call an_hour_before(?)}")) {
        ...
    }
}

我得到一个带有以下堆栈跟踪的NullPointerException

java.lang.NullPointerException
    at org.hsqldb.StatementProcedure.getParametersMetaData(Unknown Source)
    at org.hsqldb.result.Result.newPrepareResponse(Unknown Source)
    at org.hsqldb.Session.execute(Unknown Source)
    at org.hsqldb.jdbc.JDBCPreparedStatement.<init>(Unknown Source)
    at org.hsqldb.jdbc.JDBCCallableStatement.<init>(Unknown Source)
    at org.hsqldb.jdbc.JDBCConnection.prepareCall(Unknown Source)
    at com.acme.HsqlTest.test(HsqlTest.java:42)
    ...

Answer 1

这是HSQLDB 2.3.4的已知问题，已在SVN存储库中修复。使用早期版本或从/ base / trunk代码编译jar。