Question

我有一个像这样创建的表：

CREATE TABLE messages (
stream int,
sequence int,
timestamp bigint,
message blob,
PRIMARY KEY (stream, sequence)
) WITH gc_grace_seconds = 0;

在CQLSH中运行以下查询非常正常：

select * from messages where stream = 1 and sequence >= 1 and sequence <= 100;

但是，当我尝试通过Java驱动程序运行相同的操作时，我得到以下异常：

com.datastax.driver.core.exceptions.InvalidQueryException: String didn't validate.
        at com.datastax.driver.core.exceptions.InvalidQueryException.copy(InvalidQueryException.java:35)
        at com.datastax.driver.core.ResultSetFuture.extractCauseFromExecutionException(ResultSetFuture.java:271)
        at com.datastax.driver.core.ResultSetFuture.getUninterruptibly(ResultSetFuture.java:187)
        at com.datastax.driver.core.Session.execute(Session.java:126)
        at com.datastax.driver.core.Session.execute(Session.java:100)

我使用参数化查询API：

public final String FETCH_CQL = "select stream, sequence, timestamp, message "
            + "from messages where stream = ? and sequence >= ? and sequence <= ?";

session.execute(FETCH_CQL, Integer.parseInt(stream), Integer.parseInt(fromSequence), Integer.parseInt(toSequence));

是什么给出的？总体设置有效，因为我有另一个查询在不同的表上工作。

谢谢！

Answer 1

您是否尝试过添加;到查询结尾：

public final String FETCH_CQL = "select stream, sequence, timestamp, message "
            + "from messages where stream = ? and sequence >= ? and sequence <= ?**;**";

另一种选择是使用准备好的陈述：

PreparedStatement FETCH_PS = session.prepare(FETCH_CQL);
BoundStatement boundStatement = FETCH_PS.bind(Integer.parseInt(stream), Integer.parseInt(fromSequence), Integer.parseInt(toSequence));
session.execute(boundStatement);

Answer 2

将stream和sequence字段定义为UUID

类型

查询失败，出现“com.datastax.driver.core.exceptions.InvalidQueryException：String未验证”。

2 个答案: