CQL SELECT与prepareStatement失败

Question

在我的示例应用程序中，下面的代码片段工作得很好。

SELECT_CQL = "SELECT * FROM " + STREAM_NAME_IN_CASSANDRA + " WHERE '" + CONTEXT_ID_COLUMN + "'=?";
Connection connection = getConnection();
statement = connection.prepareStatement(SELECT_CQL);
statement.setString(1, "123");
resultSet = statement.executeQuery();

但是，当我试图向where子句查询中添加另一个参数时，什么都不会返回！

SELECT_CQL = "SELECT * FROM " + STREAM_NAME_IN_CASSANDRA + " WHERE '" + CONTEXT_ID_COLUMN + "'=? AND '"+TIMESTAMP_COLUMN+"'=?";
Connection connection = getConnection();
statement = connection.prepareStatement(SELECT_CQL);
statement.setString(1, "123");
statement.setString(2, "1390996577514");
resultSet = statement.executeQuery();

当我在cqlsh终端中尝试准确的查询时，它工作得很好。

Answer 1

statement.setString(2, "1390996577514");

再次检查TIMESTAMP_COLUMN的数据类型，并确保它是一个字符串。否则，需要使用适当的"set“方法。例如：

statement.setLong(2, 1390996577514L);