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# Schema Import

## 1. Overview

The schema import tool `import-schema.sh/bat` is located in `tools` directory.

## 2. Detailed Functionality

### 2.1 Parameter

| **Short Param** | **Full Param**            | **Description**                                                          | Required | Default                                   |
|-----------------|---------------------------|--------------------------------------------------------------------------| ---------- |-------------------------------------------|
| `-h`            | `-- host`                 | Hostname                                                                 | No       | 127.0.0.1                                 |
| `-p`            | `--port`                  | Port number                                                              | No       | 6667                                      |
| `-u`            | `--username`              | Username                                                                 | No       | root                                      |
| `-pw`           | `--password`              | Password. Supported for hidden input since V2.0.9-beta                   | No       | root                                      |
| `-sql_dialect`  | `--sql_dialect`           | Specifies whether the server uses`tree `model or`table `model            | No      | tree                                      |
| `-db`           | `--database`              | Target database for import                                               | Yes      | -                                         |
| `-table`        | `--table`                 | Target table for import (only applies when`-sql_dialect=table`)          | No      | -                                         |
| `-s`            | `--source`                | Local directory path containing script file(s) to import                 | Yes      |                                           |
| `-fd`           | `--fail_dir`              | Directory to save failed import files                                    | No       |                                           |
| `-lpf`          | `--lines_per_failed_file` | Maximum lines per failed file (only applies when`-sql_dialect=table`)    | No      | 100000Range：`0 to Integer.Max=2147483647` |
| `-help`         | `--help`                  | Display help information                                                 | No       |                                           |
| `-usessl`       | `--use_ssl`               | Use SSL protocol. Supported since V2.0.9-beta                            | No      | -                                    |
| `-ts`           | `--trust_store`           | Trust store. Supports hidden input. Supported since V2.0.9-beta          | No      | -                                    |
| `-tpw`          | `--trust_store_password`  | Trust store password. Supports hidden input. Supported since V2.0.9-beta | No        | -                                    |

### 2.2 Command

```Bash
# Unix/OS X
tools/import-schema.sh [-sql_dialect<sql_dialect>] -db<database> -table<table> 
     [-h <host>] [-p <port>] [-u <username>] [-pw <password>]
       -s <source> [-fd <fail_dir>] [-lpf <lines_per_failed_file>]
      
# Windows
# Before version V2.0.4.x  
tools\import-schema.bat [-sql_dialect<sql_dialect>] -db<database> -table<table>  
      [-h <host>] [-p <port>] [-u <username>] [-pw <password>]
       -s <source> [-fd <fail_dir>] [-lpf <lines_per_failed_file>] 
       
# V2.0.4.x and later versions       
tools\windows\schema\import-schema.bat [-sql_dialect<sql_dialect>] -db<database> -table<table>  
      [-h <host>] [-p <port>] [-u <username>] [-pw <password>]
       -s <source> [-fd <fail_dir>] [-lpf <lines_per_failed_file>] 
```

### 2.3 Examples

```Bash
# Before import
IoTDB> show timeseries root.treedb.**
+----------+-----+--------+--------+--------+-----------+----+----------+--------+------------------+--------+
|Timeseries|Alias|Database|DataType|Encoding|Compression|Tags|Attributes|Deadband|DeadbandParameters|ViewType|
+----------+-----+--------+--------+--------+-----------+----+----------+--------+------------------+--------+
+----------+-----+--------+--------+--------+-----------+----+----------+--------+------------------+--------+

# Execution
./import-schema.sh -sql_dialect tree -s /home/dump0_0.csv -db root.treedb

# Verification
IoTDB> show timeseries root.treedb.**
+------------------------------+-----+-----------+--------+--------+-----------+----+----------+--------+------------------+--------+
|                    Timeseries|Alias|   Database|DataType|Encoding|Compression|Tags|Attributes|Deadband|DeadbandParameters|ViewType|
+------------------------------+-----+-----------+--------+--------+-----------+----+----------+--------+------------------+--------+
|root.treedb.device.temperature| null|root.treedb|  DOUBLE| GORILLA|        LZ4|null|      null|    null|              null|    BASE|
|   root.treedb.device.humidity| null|root.treedb|  DOUBLE| GORILLA|        LZ4|null|      null|    null|              null|    BASE|
+------------------------------+-----+-----------+--------+--------+-----------+----+----------+--------+------------------+--------+
```