[GitHub] [shardingsphere] RaigorJiang commented on a diff in pull request #23134: Add IF NOT EXISTS to all CREATE statements in DistSQL documents

[GitBox <gi...@apache.org>]

RaigorJiang commented on code in PR #23134:
URL: https://github.com/apache/shardingsphere/pull/23134#discussion_r1058665871


##########
docs/document/content/reference/distsql/syntax/rdl/rule-definition/readwrite-splitting/create-readwrite-splitting-rule.cn.md:
##########
@@ -79,6 +83,28 @@ CREATE READWRITE_SPLITTING RULE ms_group_1 (
 );
 ```
 
+#### 使用 `ifNotExists` 子句创建读写分离规则
+
+- 静态读写分离规则
+
+```sql
+CREATE READWRITE_SPLITTING RULE IF NOT EXISTS ms_group_0 (
+    WRITE_STORAGE_UNIT=write_ds,
+    READ_STORAGE_UNITS(read_ds_0,read_ds_1),
+    TYPE(NAME="random")
+);
+```
+
+- 动态读写分离规则
+
+```sql
+CREATE READWRITE_SPLITTING RULE IF NOT EXISTS ms_group_1 (
+    AUTO_AWARE_RESOURCE=group_0,
+    WRITE_DATA_SOURCE_QUERY_ENABLED=false,
+    TYPE(NAME="random",PROPERTIES("read_weight"="2:1"))

Review Comment:
   Random algorithm does need properties, please remove it .



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