是否有任何API让maingoroutine永远睡觉?
换句话说,我希望我的项目总是运行,除非我停止它.
我想通过Windows环境中的进程名称获取进程ID?
我发现golang只有api os.FindProcess(id),但没有名字.
在 Cassandra 中,我使用 cql:
select msg from log where id in ('A', 'B') and filter1 = 'filter'
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(其中id是分区键,filter1是二级索引,filter1不能用作簇列)
这给出了响应:
Select on indexed columns and with IN clause for the PRIMARY KEY are not supported
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如何更改 CQL 来防止这种情况发生?
我希望nested每次更新时都在对象中添加一个对象.
例如,我有一个doc:
{
"test":[{"remark":"remark1"}]
}
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下次,我想在remark测试字段中添加一个对象并保存旧remark对象.结果是:
{
"test":[{"remark":"remark1"},{"remark":"remark2"}]
}
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怎么实现呢?
编辑 我使用脚本:
{
"script": "ctx._source.test= ((ctx._source.test?: []) += remarkItem)",
"params": {
"remarkItem": {
"remark": "addd"
}
}
}
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但是,我得到了例外:
{
"error": {
"root_cause": [
{
"type": "remote_transport_exception",
"reason": "[es77][10.14.84.77:9300][indices:data/write/update[s]]"
}
],
"type": "illegal_argument_exception",
"reason": "failed to execute script",
"caused_by": {
"type": "script_exception",
"reason": "Failed to compile inline script [ctx._source.test= ((ctx._source.test?: []) += remarkItem)] using lang [groovy]",
"caused_by": {
"type": "script_exception",
"reason": "failed to compile …Run Code Online (Sandbox Code Playgroud) 在mysql我可以sql SELECT LEFT(field,4) from table用来搜索一个字段的4个字节.
Elasticsearch 有类似的语法?