docs/UserGuide/Syntax-Conventions/Session-And-TsFile-API.md

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# Session And TsFile API

When using the Session and TsFile APIs, if the method you call requires parameters such as measurement, device, database, path in the form of String, **please ensure that the parameters passed in the input string is the same as when using the SQL statement**, here are some examples to help you understand. Code example could be found at: `example/session/src/main/java/org/apache/iotdb/SyntaxConventionRelatedExample.java`

1. Take creating a time series createTimeseries as an example:

```java
public void createTimeseries(
    String path,
    TSDataType dataType,
    TSEncoding encoding,
    CompressionType compressor)
    throws IoTDBConnectionException, StatementExecutionException;
```

If you wish to create the time series root.sg.a, root.sg.\`a.\`\`"b\`, root.sg.\`111\`, the SQL statement you use should look like this:

```sql
create timeseries root.sg.a with datatype=FLOAT,encoding=PLAIN,compressor=SNAPPY;

# node names contain special characters, each node in the time series is ["root","sg","a.`\"b"]
create timeseries root.sg.`a.``"b` with datatype=FLOAT,encoding=PLAIN,compressor=SNAPPY;

# node names are pure numbers
create timeseries root.sg.`111` with datatype=FLOAT,encoding=PLAIN,compressor=SNAPPY;
```

When you call the createTimeseries method, you should assign the path string as follows to ensure that the content of the path string is the same as when using SQL:

```java
// timeseries root.sg.a
String path = "root.sg.a";

// timeseries root.sg.`a.``"b`
String path = "root.sg.`a.``\"b`";

// timeseries root.sg.`111`
String path = "root.sg.`111`";
```

2. Take inserting data insertRecord as an example:

```java
public void insertRecord(
    String deviceId,
    long time,
    List<String> measurements,
    List<TSDataType> types,
    Object... values)
    throws IoTDBConnectionException, StatementExecutionException;
```

If you want to insert data into the time series root.sg.a, root.sg.\`a.\`\`"b\`, root.sg.\`111\`, the SQL statement you use should be as follows:

```sql
insert into root.sg(timestamp, a, `a.``"b`, `111`) values (1, 2, 2, 2);
```

When you call the insertRecord method, you should assign deviceId and measurements as follows:

```java
// deviceId is root.sg
String deviceId = "root.sg";

// measurements
String[] measurements = new String[]{"a", "`a.``\"b`", "`111`"};
List<String> measurementList = Arrays.asList(measurements);
```

3. Take executeRawDataQuery as an example:

```java
public SessionDataSet executeRawDataQuery(
    List<String> paths, 
    long startTime, 
    long endTime)
    throws StatementExecutionException, IoTDBConnectionException;
```

If you wish to query the data of the time series root.sg.a, root.sg.\`a.\`\`"b\`, root.sg.\`111\`, the SQL statement you use should be as follows :

```sql
select a from root.sg

# node name contains special characters
select `a.``"b` from root.sg;

# node names are pure numbers
select `111` from root.sg
```

When you call the executeRawDataQuery method, you should assign paths as follows:

```java
// paths
String[] paths = new String[]{"root.sg.a", "root.sg.`a.``\"b`", "root.sg.`111`"};
List<String> pathList = Arrays.asList(paths);
```