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## Go Native API

### Dependencies

 * golang >= 1.13
 * make   >= 3.0
 * curl   >= 7.1.1
 * thrift 0.13.x
 * Linux、Macos or other unix-like systems
 * Windows+bash (WSL、cygwin、Git Bash)


### Installation

 * go mod

```sh
export GO111MODULE=on
export GOPROXY=https://goproxy.io

mkdir session_example && cd session_example

curl -o session_example.go -L https://github.com/apache/iotdb-client-go/raw/main/example/session_example.go

go mod init session_example
go run session_example.go
```

* GOPATH

```sh
# get thrift 0.13.0
go get github.com/apache/thrift
cd $GOPATH/src/github.com/apache/thrift
git checkout 0.13.0

mkdir -p $GOPATH/src/iotdb-client-go-example/session_example
cd $GOPATH/src/iotdb-client-go-example/session_example
curl -o session_example.go -L https://github.com/apache/iotdb-client-go/raw/main/example/session_example.go
go run session_example.go
```

### How to Use the SessionPool
SessionPool is a wrapper of a Session Set. Using SessionPool, the user do not need to consider how to reuse a session connection.
If there is no available connections and the pool reaches its max size, the all methods will hang until there is a available connection.
The PutBack method must be called after use

#### New sessionPool

```golang
config := &client.PoolConfig{
    Host:     host,
    Port:     port,
    UserName: user,
    Password: password,
}
sessionPool = client.NewSessionPool(config, 3, 60000, 60000, false)
```

#### Get session through sessionPool, putback after use

set storage group

```golang
session, err := sessionPool.GetSession()
defer sessionPool.PutBack(session)
if err == nil {
    session.SetStorageGroup(sg)
}
```

query statement

```golang
var timeout int64 = 1000
session, err := sessionPool.GetSession()
defer sessionPool.PutBack(session)
if err != nil {
    log.Print(err)
    return
}
sessionDataSet, err := session.ExecuteQueryStatement(sql, &timeout)
if err == nil {
    defer sessionDataSet.Close()
    printDataSet1(sessionDataSet)
} else {
    log.Println(err)
}
```