add parentnode example in tree creating database

src/UserGuide/Master/Tree/Basic-Concept/Operate-Metadata_apache.md

@@ -36,13 +36,20 @@ We can thus create two databases using the above two SQL statements.
 
 It is worth noting that 1 database is recommended.
 
-When the path itself or the parent/child layer of the path is already created as database, the path is then not allowed to be created as database. For example, it is not feasible to create `root.ln.wf01` as database when two databases `root.ln` and `root.sgcc` exist. The system gives the corresponding error prompt as shown below:
+When the path itself or the parent/child layer of the path is already created as database, the path is then not allowed to be created as database.
+
+For example, when the databases root.ln and root.sgcc already exist, creating the database root.ln.wf01 is not allowed. The system will return the corresponding error message as shown below:
 
 ```sql
 CREATE DATABASE root.ln.wf01;
-Msg: 300: root.ln has already been created as database;
-create database root.ln.wf01;
-Msg: 300: root.ln has already been created as database;
+Msg: org.apache.iotdb.jdbc.IoTDBSQLException: 501: root.ln has already been created as a database
+```
+
+Similarly, when the database root.db.test already exists, creating the database root.db is not allowed either. The system will return the corresponding error message as shown below:
+
+```sql
+CREATE DATABASE root.db;
+Msg: org.apache.iotdb.jdbc.IoTDBSQLException: 529: Some children of root.db have already been created as datab
 ```
 
 Database Node Naming Rules:

src/UserGuide/Master/Tree/Basic-Concept/Operate-Metadata_timecho.md

@@ -36,13 +36,20 @@ We can thus create two databases using the above two SQL statements.
 
 It is worth noting that 1 database is recommended.
 
-When the path itself or the parent/child layer of the path is already created as database, the path is then not allowed to be created as database. For example, it is not feasible to create `root.ln.wf01` as database when two databases `root.ln` and `root.sgcc` exist. The system gives the corresponding error prompt as shown below:
+When the path itself or the parent/child layer of the path is already created as database, the path is then not allowed to be created as database. 
+
+For example, when the databases root.ln and root.sgcc already exist, creating the database root.ln.wf01 is not allowed. The system will return the corresponding error message as shown below:
 
 ```sql
 CREATE DATABASE root.ln.wf01;
-Msg: 300: root.ln has already been created as database;
-create database root.ln.wf01;
-Msg: 300: root.ln has already been created as database;
+Msg: org.apache.iotdb.jdbc.IoTDBSQLException: 501: root.ln has already been created as a database
+```
+
+Similarly, when the database root.db.test already exists, creating the database root.db is not allowed either. The system will return the corresponding error message as shown below:
+
+```sql
+CREATE DATABASE root.db;
+Msg: org.apache.iotdb.jdbc.IoTDBSQLException: 529: Some children of root.db have already been created as datab
 ```
 
 Database Node Naming Rules:

src/UserGuide/latest/Basic-Concept/Operate-Metadata_apache.md

@@ -36,13 +36,20 @@ We can thus create two databases using the above two SQL statements.
 
 It is worth noting that 1 database is recommended.
 
-When the path itself or the parent/child layer of the path is already created as database, the path is then not allowed to be created as database. For example, it is not feasible to create `root.ln.wf01` as database when two databases `root.ln` and `root.sgcc` exist. The system gives the corresponding error prompt as shown below:
+When the path itself or the parent/child layer of the path is already created as database, the path is then not allowed to be created as database.
+
+For example, when the databases root.ln and root.sgcc already exist, creating the database root.ln.wf01 is not allowed. The system will return the corresponding error message as shown below:
 
 ```sql
 CREATE DATABASE root.ln.wf01;
-Msg: 300: root.ln has already been created as database;
-create database root.ln.wf01;
-Msg: 300: root.ln has already been created as database;
+Msg: org.apache.iotdb.jdbc.IoTDBSQLException: 501: root.ln has already been created as a database
+```
+
+Similarly, when the database root.db.test already exists, creating the database root.db is not allowed either. The system will return the corresponding error message as shown below:
+
+```sql
+CREATE DATABASE root.db;
+Msg: org.apache.iotdb.jdbc.IoTDBSQLException: 529: Some children of root.db have already been created as datab
 ```
 
 Database Node Naming Rules:

src/UserGuide/latest/Basic-Concept/Operate-Metadata_timecho.md

@@ -36,13 +36,20 @@ We can thus create two databases using the above two SQL statements.
 
 It is worth noting that 1 database is recommended.
 
-When the path itself or the parent/child layer of the path is already created as database, the path is then not allowed to be created as database. For example, it is not feasible to create `root.ln.wf01` as database when two databases `root.ln` and `root.sgcc` exist. The system gives the corresponding error prompt as shown below:
+When the path itself or the parent/child layer of the path is already created as database, the path is then not allowed to be created as database. 
+
+For example, when the databases root.ln and root.sgcc already exist, creating the database root.ln.wf01 is not allowed. The system will return the corresponding error message as shown below:
 
 ```sql
 CREATE DATABASE root.ln.wf01;
-Msg: 300: root.ln has already been created as database;
-create database root.ln.wf01;
-Msg: 300: root.ln has already been created as database;
+Msg: org.apache.iotdb.jdbc.IoTDBSQLException: 501: root.ln has already been created as a database
+```
+
+Similarly, when the database root.db.test already exists, creating the database root.db is not allowed either. The system will return the corresponding error message as shown below:
+
+```sql
+CREATE DATABASE root.db;
+Msg: org.apache.iotdb.jdbc.IoTDBSQLException: 529: Some children of root.db have already been created as datab
 ```
 
 Database Node Naming Rules:

src/zh/UserGuide/Master/Tree/Basic-Concept/Operate-Metadata_apache.md

@@ -35,12 +35,21 @@ CREATE DATABASE root.ln;
 
 需要注意的是，推荐创建一个 database. 
 
-Database 的父子节点都不能再设置 database。例如在已经有`root.ln`和`root.sgcc`这两个 database 的情况下，创建`root.ln.wf01` database 是不可行的。系统将给出相应的错误提示，如下所示：
+Database 的父子节点都不能再设置 database。
+
+例如在已经有`root.ln`和`root.sgcc`这两个 database 的情况下，创建`root.ln.wf01` database 是不可行的。系统将给出相应的错误提示，如下所示：
 
 ```sql
 CREATE DATABASE root.ln.wf01;
-Msg: 300: root.ln has already been created as database.
+Msg: org.apache.iotdb.jdbc.IoTDBSQLException: 501: root.ln has already been created as database
 ```
+同样，在已经有 `root.db.test` 这个 database 的情况下，创建 `root.db` database 也是不可行的。系统也会给出相应的错误提示，如下所示：
+
+```sql
+CREATE DATABASE root.db;
+Msg: org.apache.iotdb.jdbc.IoTDBSQLException: 529: some children of root.db have already been created as database
+```
+
 Database 节点名命名规则:
 1. 节点名可由**中英文字符、数字、下划线（\_）、英文句号（.）、反引号（\`）** 组成
 2. 若节点名为以下情况，则必须用**反引号（\`）** 将整个名称包裹。

src/zh/UserGuide/Master/Tree/Basic-Concept/Operate-Metadata_timecho.md

@@ -35,12 +35,21 @@ CREATE DATABASE root.ln;
 
 需要注意的是，推荐创建一个 database. 
 
-Database 的父子节点都不能再设置 database。例如在已经有`root.ln`和`root.sgcc`这两个 database 的情况下，创建`root.ln.wf01` database 是不可行的。系统将给出相应的错误提示，如下所示：
+Database 的父子节点都不能再设置 database。
+
+例如在已经有`root.ln`和`root.sgcc`这两个 database 的情况下，创建`root.ln.wf01` database 是不可行的。系统将给出相应的错误提示，如下所示：
 
 ```sql
 CREATE DATABASE root.ln.wf01;
-Msg: 300: root.ln has already been created as database.
+Msg: org.apache.iotdb.jdbc.IoTDBSQLException: 501: root.ln has already been created as database
+```
+同样，在已经有 `root.db.test` 这个 database 的情况下，创建 `root.db` database 也是不可行的。系统也会给出相应的错误提示，如下所示：
+
+```sql
+CREATE DATABASE root.db;
+Msg: org.apache.iotdb.jdbc.IoTDBSQLException: 529: some children of root.db have already been created as database
 ```
+
 Database 节点名命名规则:
 1. 节点名可由**中英文字符、数字、下划线（\_）、英文句号（.）、反引号（\`）** 组成
 2. 若节点名为以下情况，则必须用**反引号（\`）** 将整个名称包裹。
@@ -464,6 +473,7 @@ ALTER TIMESERIES <oldPath> RENAME TO <newPath>
 ALTER TIMESERIES root.ln.wf01.wt01.temperature RENAME TO root.newln.newwf.newwt.temperature; 
 ```
 
+
 ### 2.5 删除时间序列
 
 我们可以使用`(DELETE | DROP) TimeSeries <PathPattern>`语句来删除我们之前创建的时间序列。SQL 语句如下所示：

src/zh/UserGuide/latest/Basic-Concept/Operate-Metadata_apache.md

@@ -35,12 +35,21 @@ CREATE DATABASE root.ln;
 
 需要注意的是，推荐创建一个 database. 
 
-Database 的父子节点都不能再设置 database。例如在已经有`root.ln`和`root.sgcc`这两个 database 的情况下，创建`root.ln.wf01` database 是不可行的。系统将给出相应的错误提示，如下所示：
+Database 的父子节点都不能再设置 database。
+
+例如在已经有`root.ln`和`root.sgcc`这两个 database 的情况下，创建`root.ln.wf01` database 是不可行的。系统将给出相应的错误提示，如下所示：
 
 ```sql
 CREATE DATABASE root.ln.wf01;
-Msg: 300: root.ln has already been created as database.
+Msg: org.apache.iotdb.jdbc.IoTDBSQLException: 501: root.ln has already been created as database
 ```
+同样，在已经有 `root.db.test` 这个 database 的情况下，创建 `root.db` database 也是不可行的。系统也会给出相应的错误提示，如下所示：
+
+```sql
+CREATE DATABASE root.db;
+Msg: org.apache.iotdb.jdbc.IoTDBSQLException: 529: some children of root.db have already been created as database
+```
+
 Database 节点名命名规则:
 1. 节点名可由**中英文字符、数字、下划线（\_）、英文句号（.）、反引号（\`）** 组成
 2. 若节点名为以下情况，则必须用**反引号（\`）** 将整个名称包裹。

src/zh/UserGuide/latest/Basic-Concept/Operate-Metadata_timecho.md

@@ -35,12 +35,21 @@ CREATE DATABASE root.ln;
 
 需要注意的是，推荐创建一个 database. 
 
-Database 的父子节点都不能再设置 database。例如在已经有`root.ln`和`root.sgcc`这两个 database 的情况下，创建`root.ln.wf01` database 是不可行的。系统将给出相应的错误提示，如下所示：
+Database 的父子节点都不能再设置 database。
+
+例如在已经有`root.ln`和`root.sgcc`这两个 database 的情况下，创建`root.ln.wf01` database 是不可行的。系统将给出相应的错误提示，如下所示：
 
 ```sql
 CREATE DATABASE root.ln.wf01;
-Msg: 300: root.ln has already been created as database.
+Msg: org.apache.iotdb.jdbc.IoTDBSQLException: 501: root.ln has already been created as database
 ```
+同样，在已经有 `root.db.test` 这个 database 的情况下，创建 `root.db` database 也是不可行的。系统也会给出相应的错误提示，如下所示：
+
+```sql
+CREATE DATABASE root.db;
+Msg: org.apache.iotdb.jdbc.IoTDBSQLException: 529: some children of root.db have already been created as database
+```
+
 Database 节点名命名规则:
 1. 节点名可由**中英文字符、数字、下划线（\_）、英文句号（.）、反引号（\`）** 组成
 2. 若节点名为以下情况，则必须用**反引号（\`）** 将整个名称包裹。