docs: go connector support native stmt2 binding
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@ -96,9 +96,19 @@ This is a [more detailed parameter binding example](https://github.com/taosdata/
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</TabItem>
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<TabItem label="Go" value="go">
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The example code for binding parameters with stmt2 (Go connector v3.6.0 and above, TDengine v3.3.5.0 and above) is as follows:
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```go
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{{#include docs/examples/go/stmt2/native/main.go}}
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```
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The example code for binding parameters with stmt is as follows:
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```go
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{{#include docs/examples/go/stmt/native/main.go}}
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```
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</TabItem>
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<TabItem label="Rust" value="rust">
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@ -493,6 +493,43 @@ The `af` package provides more interfaces using native connections for parameter
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* **Interface Description**: Closes the statement.
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* **Return Value**: Error information.
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From version 3.6.0, the `stmt2` interface for binding parameters is provided.
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* `func (conn *Connector) Stmt2(reqID int64, singleTableBindOnce bool) *Stmt2`
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* **Interface Description**: Returns a Stmt2 object bound to this connection.
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* **Parameter Description**:
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* `reqID`: Request ID.
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* `singleTableBindOnce`: Indicates whether a single child table is bound only once during a single execution.
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* **Return Value**: Stmt2 object.
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* `func (s *Stmt2) Prepare(sql string) error`
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* **Interface Description**: Prepares an SQL.
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* **Parameter Description**:
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* `sql`: The statement for parameter binding.
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* **Return Value**: Error information.
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* `func (s *Stmt2) Bind(params []*stmt.TaosStmt2BindData) error`
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* **Interface Description**: Binds data to the prepared statement.
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* **Parameter Description**:
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* `params`: The data to bind.
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* **Return Value**: Error information.
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* `func (s *Stmt2) Execute() error`
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* **Interface Description**: Executes the batch.
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* **Return Value**: Error information.
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* `func (s *Stmt2) GetAffectedRows() int`
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* **Interface Description**: Gets the number of affected rows (only valid for insert statements).
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* **Return Value**: Number of affected rows.
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* `func (s *Stmt2) UseResult() (driver.Rows, error)`
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* **Interface Description**: Retrieves the result set (only valid for query statements).
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* **Return Value**: Result set Rows object, error information.
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* `func (s *Stmt2) Close() error`
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* **Interface Description**: Closes the statement.
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* **Return Value**: Error information.
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The `ws/stmt` package provides interfaces for parameter binding via WebSocket
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* `func (c *Connector) Init() (*Stmt, error)`
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@ -0,0 +1,84 @@
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package main
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import (
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"database/sql/driver"
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"fmt"
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"log"
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"math/rand"
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"time"
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"github.com/taosdata/driver-go/v3/af"
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"github.com/taosdata/driver-go/v3/common"
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"github.com/taosdata/driver-go/v3/common/stmt"
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)
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func main() {
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host := "127.0.0.1"
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numOfSubTable := 10
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numOfRow := 10
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db, err := af.Open(host, "root", "taosdata", "", 0)
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if err != nil {
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log.Fatalln("Failed to connect to " + host + "; ErrMessage: " + err.Error())
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}
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defer db.Close()
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// prepare database and table
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_, err = db.Exec("CREATE DATABASE IF NOT EXISTS power")
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if err != nil {
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log.Fatalln("Failed to create database power, ErrMessage: " + err.Error())
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}
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_, err = db.Exec("USE power")
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if err != nil {
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log.Fatalln("Failed to use database power, ErrMessage: " + err.Error())
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}
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_, err = db.Exec("CREATE STABLE IF NOT EXISTS meters (ts TIMESTAMP, current FLOAT, voltage INT, phase FLOAT) TAGS (groupId INT, location BINARY(24))")
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if err != nil {
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log.Fatalln("Failed to create stable meters, ErrMessage: " + err.Error())
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}
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// prepare statement
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sql := "INSERT INTO ? USING meters TAGS(?,?) VALUES (?,?,?,?)"
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reqID := common.GetReqID()
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stmt2 := db.Stmt2(reqID, false)
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err = stmt2.Prepare(sql)
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if err != nil {
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log.Fatalln("Failed to prepare sql, sql: " + sql + ", ErrMessage: " + err.Error())
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}
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for i := 1; i <= numOfSubTable; i++ {
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// generate column data
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current := time.Now()
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columns := make([][]driver.Value, 4)
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for j := 0; j < numOfRow; j++ {
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columns[0] = append(columns[0], current.Add(time.Millisecond*time.Duration(j)))
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columns[1] = append(columns[1], rand.Float32()*30)
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columns[2] = append(columns[2], rand.Int31n(300))
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columns[3] = append(columns[3], rand.Float32())
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}
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// generate bind data
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tableName := fmt.Sprintf("d_bind_%d", i)
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tags := []driver.Value{int32(i), []byte(fmt.Sprintf("location_%d", i))}
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bindData := []*stmt.TaosStmt2BindData{
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{
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TableName: tableName,
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Tags: tags,
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Cols: columns,
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},
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}
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// bind params
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err = stmt2.Bind(bindData)
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if err != nil {
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log.Fatalln("Failed to bind params, ErrMessage: " + err.Error())
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}
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// execute batch
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err = stmt2.Execute()
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if err != nil {
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log.Fatalln("Failed to exec, ErrMessage: " + err.Error())
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}
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// get affected rows
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affected := stmt2.GetAffectedRows()
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// you can check exeResult here
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fmt.Printf("Successfully inserted %d rows to %s.\n", affected, tableName)
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}
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err = stmt2.Close()
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if err != nil {
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log.Fatal("failed to close statement, err:", err)
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}
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}
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@ -91,9 +91,20 @@ import TabItem from "@theme/TabItem";
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```
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</TabItem>
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<TabItem label="Go" value="go">
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stmt2 绑定参数的示例代码如下（go 连接器 v3.6.0 及以上，TDengine v3.3.5.0 及以上）：
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```go
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{{#include docs/examples/go/stmt2/native/main.go}}
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```
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stmt 绑定参数的示例代码如下：
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```go
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{{#include docs/examples/go/stmt/native/main.go}}
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```
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</TabItem>
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<TabItem label="Rust" value="rust">
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@ -494,6 +494,37 @@ Prepare 允许使用预编译的 SQL 语句，可以提高性能并提供参数
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- **接口说明**：关闭语句。
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- **返回值**：错误信息。
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从 3.6.0 版本开始，提供 stmt2 绑定参数的接口
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- `func (conn *Connector) Stmt2(reqID int64, singleTableBindOnce bool) *Stmt2`
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- **接口说明**：从连接创建 stmt2。
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- **参数说明**：
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- `reqID`：请求 ID。
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- `singleTableBindOnce`：单个子表在单次执行中只有一次数据绑定。
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- **返回值**：stmt2 对象。
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- `func (s *Stmt2) Prepare(sql string) error`
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- **接口说明**：绑定 sql 语句。
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- **参数说明**：
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- `sql`：要绑定的 sql 语句。
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- **返回值**：错误信息。
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- `func (s *Stmt2) Bind(params []*stmt.TaosStmt2BindData) error`
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- **接口说明**：绑定数据。
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- **参数说明**：
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- params要绑定的数据。
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- **返回值**：错误信息。
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- `func (s *Stmt2) Execute() error`
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- **接口说明**：执行语句。
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- **返回值**：错误信息。
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- `func (s *Stmt2) GetAffectedRows() int`
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- **接口说明**：获取受影响行数（只在插入语句有效）。
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- **返回值**：受影响行数。
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- `func (s *Stmt2) UseResult() (driver.Rows, error)`
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- **接口说明**：获取结果集（只在查询语句有效）。
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- **返回值**：结果集 Rows 对象，错误信息。
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- `func (s *Stmt2) Close() error`
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- **接口说明**：关闭stmt2。
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- **返回值**：错误信息。
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`ws/stmt` 包提供了通过 WebSocket 进行参数绑定的接口
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- `func (c *Connector) Init() (*Stmt, error)`
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