taotao365s opened a new issue #13865:
URL: https://github.com/apache/shardingsphere/issues/13865
## Question
background: shardingsphere 5.0
- application.yml
````
spring.shardingsphere.rules.sharding.tables.t_dict.key-generate-strategy.column=id
spring.shardingsphere.rules.sharding.tables.t_dict.key-generate-strategy.key-generator-name=dict_primary_key
spring.shardingsphere.rules.sharding.key-generators.dict_primary_key.type=BIZ_PRIMARY_KEY
spring.shardingsphere.rules.sharding.key-generators.dict_primary_key.props.biz-type=dict
````
- BizPrimaryKeyGenerateAlgorithm.java
````
public final class BizPrimaryKeyGenerateAlgorithm implements
KeyGenerateAlgorithm {
@Getter
@Setter
private Properties props = new Properties();
private String bizType;
@Override
public Comparable<?> generateKey() {
//TODO
}
@Override
public void init() {
this.bizType = props.getProperty("biz-type", "default");
log.info("init biz type={}", this.bizType);
}
@Override
public String getType() {
return "BIZ_PRIMARY_KEY";
}
}
````
- when I set `key-generator-name` is `dict_primary_key`, props is always
null in BizPrimaryKeyGenerateAlgorithm.java
- then I debug it to `PropertyUtil.containPropertyPrefix --> v2`
````
@SneakyThrows(ReflectiveOperationException.class)
private static Object v2(final Environment environment, final String
prefix, final Class<?> targetClass) {
Class<?> binderClass =
Class.forName("org.springframework.boot.context.properties.bind.Binder");
Method getMethod = binderClass.getDeclaredMethod("get",
Environment.class);
Method bindMethod = binderClass.getDeclaredMethod("bind",
String.class, Class.class);
Object binderObject = getMethod.invoke(null, environment);
String prefixParam = prefix.endsWith(".") ? prefix.substring(0,
prefix.length() - 1) : prefix;
Object bindResultObject = bindMethod.invoke(binderObject,
prefixParam, targetClass);
Method resultGetMethod =
bindResultObject.getClass().getDeclaredMethod("get");
return resultGetMethod.invoke(bindResultObject);
}
````
so what does v2 function mean?
when I change `key-generator-name` to `dict-primary-key`, props have values
in BizPrimaryKeyGenerateAlgorithm.java
````
spring.shardingsphere.rules.sharding.tables.t_dict.key-generate-strategy.column=id
spring.shardingsphere.rules.sharding.tables.t_dict.key-generate-strategy.key-generator-name=dict-primary-key
spring.shardingsphere.rules.sharding.key-generators.dict-primary-key.type=BIZ_PRIMARY_KEY
spring.shardingsphere.rules.sharding.key-generators.dict-primary-key.props.biz-type=dict
````
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