[Feat]: add export application based on oceanbase mysql tenant

.github/workflows/ci.yml

@@ -91,3 +91,17 @@ jobs:
         run: |
           cd applications/sveltekit
           pnpm install
+
+  application-mydata:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out repository code
+        uses: actions/checkout@v4
+      - name: Set Go env
+        uses: actions/setup-go@v4
+        with:
+          go-version: '1.20'
+      - name: Build and run sample
+        run: |
+          cd applications/mydata
+          make && ./dist/mydata exp -h

applications/mydata/.gitignore

@@ -0,0 +1,3 @@
+.idea/
+testdata/
+vendor/

applications/mydata/LICENSE

@@ -0,0 +1,127 @@
+                     木兰宽松许可证, 第2版
+
+   木兰宽松许可证， 第2版 
+   2020年1月 http://license.coscl.org.cn/MulanPSL2
+
+
+   您对“软件”的复制、使用、修改及分发受木兰宽松许可证，第2版（“本许可证”）的如下条款的约束：
+
+   0. 定义
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+
+   条款结束 
+
+   如何将木兰宽松许可证，第2版，应用到您的软件
+
+   如果您希望将木兰宽松许可证，第2版，应用到您的新软件，为了方便接收者查阅，建议您完成如下三步：
+
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+
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+
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+
+   Copyright (c) [Year] [name of copyright holder]
+   [Software Name] is licensed under Mulan PSL v2.
+   You can use this software according to the terms and conditions of the Mulan PSL v2. 
+   You may obtain a copy of Mulan PSL v2 at:
+            http://license.coscl.org.cn/MulanPSL2 
+   THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT, MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.  
+   See the Mulan PSL v2 for more details.  
+
+
+                     Mulan Permissive Software License，Version 2
+
+   Mulan Permissive Software License，Version 2 (Mulan PSL v2)
+   January 2020 http://license.coscl.org.cn/MulanPSL2
+
+   Your reproduction, use, modification and distribution of the Software shall be subject to Mulan PSL v2 (this License) with the following terms and conditions: 
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+   0. Definition
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+      Software means the program and related documents which are licensed under this License and comprise all Contribution(s). 
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+
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+
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+
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+
+      THIS LICENSE IS WRITTEN IN BOTH CHINESE AND ENGLISH, AND THE CHINESE VERSION AND ENGLISH VERSION SHALL HAVE THE SAME LEGAL EFFECT. IN THE CASE OF DIVERGENCE BETWEEN THE CHINESE AND ENGLISH VERSIONS, THE CHINESE VERSION SHALL PREVAIL.
+
+   END OF THE TERMS AND CONDITIONS
+
+   How to Apply the Mulan Permissive Software License，Version 2 (Mulan PSL v2) to Your Software
+
+      To apply the Mulan PSL v2 to your work, for easy identification by recipients, you are suggested to complete following three steps:
+
+      i Fill in the blanks in following statement, including insert your software name, the year of the first publication of your software, and your name identified as the copyright owner; 
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+
+
+   Copyright (c) [Year] [name of copyright holder]
+   [Software Name] is licensed under Mulan PSL v2.
+   You can use this software according to the terms and conditions of the Mulan PSL v2. 
+   You may obtain a copy of Mulan PSL v2 at:
+               http://license.coscl.org.cn/MulanPSL2 
+   THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT, MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.  
+   See the Mulan PSL v2 for more details.  

applications/mydata/Makefile

@@ -0,0 +1,29 @@
+
+
+REPO    := mydata
+
+GOOS    := $(if $(GOOS),$(GOOS),$(shell go env GOOS))
+GOARCH  := $(if $(GOARCH),$(GOARCH),$(shell go env GOARCH))
+GOENV   := GO111MODULE=on CGO_ENABLED=1 GOOS=$(GOOS) GOARCH=$(GOARCH)
+GO      := $(GOENV) go
+GOBUILD := $(GO) build -trimpath
+GORUN   := $(GO) run
+SHELL   := /usr/bin/env bash
+
+COMMIT  := $(shell git describe --always --no-match --tags --dirty="-dev")
+BUILDTS := $(shell date '+%Y-%m-%d %H:%M:%S')
+GITHASH := $(shell git rev-parse HEAD)
+GITREF  := $(shell git rev-parse --abbrev-ref HEAD)
+GOVER   := $(shell go version)
+
+LDFLAGS := -w -s
+LDFLAGS += -X "$(REPO)/internal/version.ReleaseVersion=$(COMMIT)"
+LDFLAGS += -X "$(REPO)/internal/version.BuildTS=$(BUILDTS)"
+LDFLAGS += -X "$(REPO)/internal/version.GitHash=$(GITHASH)"
+LDFLAGS += -X "$(REPO)/internal/version.GitBranch=$(GITREF)"
+LDFLAGS += -X "$(REPO)/internal/version.GoVersion=$(GOVER)"
+
+all: mydata
+
+mydata:
+	$(GOBUILD) -ldflags '$(LDFLAGS)' -o ./dist/mydata main.go

applications/mydata/README.md

@@ -0,0 +1,62 @@
+# A Fast and Flexible export data from remote mysql server
+
+### how to use
+`go run main.go` or you can `go build -o mydata main.go && ./mydata -h`
+
+### cmd help
+
+```text
+Usage:
+    mydata [flags]
+    mydata [command]
+
+Available Commands:
+    completion  Generate the autocompletion script for the specified shell
+    export      Export data from remote database server
+    help        Help about any command
+    hex         Convert hex string to byte
+    import      Import data to remote database server
+    version     Print the version number of tool
+
+Flags:
+    --debug   print stack log
+    -h, --help    help for mydata
+
+Use "mydata [command] --help" for more information about a command.
+```
+
+### How to export data
+pls type help:
+`./mydata exp -h`
+
+```text
+Export data from remote database server
+
+Usage:
+  mydata export [flags]
+
+Aliases:
+  export, exp
+
+Flags:
+  -a, --addr string                mysql database addr, format: ip:port
+  -u, --username string            username for connect database
+  -p, --password string            password for connect database
+  -D, --dbname string              default database name
+  -e, --query-sql string           select sql
+  -o, --output string              output filename
+      --fields-terminated string   fields terminated (default ",")
+      --fields-enclosed string     fields enclosed
+      --fields-escaped string      fields escaped (default "\\")
+      --lines-terminated string    lines terminated (default "\n")
+      --enclosed-optionally        fields enclosed optionally
+      --params string              connection Params (default "timeout=3s")
+      --buf-size int               buf size for write outfile (default 32768)
+      --concurrency int            concurrency number (default 5)
+      --not-merge                  merge chunks to one file
+```
+### example
+export data by `select * from bigdata` from 127.0.0.1
+```shell
+./mydata exp -a 127.0.0.1:3306 -u username@tenant#clustername:clusterid -p xxx -D test -e "select * from bigdata" -o bigdata
+```

applications/mydata/app/export/export.go

@@ -0,0 +1,116 @@
+package export
+
+import (
+	"context"
+	"log"
+
+	"github.com/pkg/errors"
+
+	"mydata/internal/dbinfo"
+	"mydata/internal/file"
+)
+
+type Exporter struct {
+	ChunkSeq    int             // 分块序号
+	DbConf      dbinfo.DbConf   // 数据库配置信息
+	Query       string          // 输入查询sql
+	EnclosedOps bool            // 包裹符标记
+	OutFile     *file.MyOutfile // 输出文件
+}
+
+func (e *Exporter) ExpData() error {
+	conn, err := dbinfo.NewDB(e.DbConf)
+	if err != nil {
+		return err
+	}
+	defer func() {
+		_ = conn.Close()
+	}()
+
+	ctx, cancelFunc := context.WithCancel(context.Background())
+	defer cancelFunc()
+
+	log.Printf("[chunk:%02d]execute query sql:[%s]", e.ChunkSeq, e.Query)
+	rows, err := conn.QueryContext(ctx, e.Query)
+	if err != nil {
+		return errors.Wrapf(err, "query sql:[%s]", e.Query)
+	}
+	defer func() {
+		_ = rows.Close()
+	}()
+
+	isChar, isEnclosed, err := dbinfo.MakeColFlags(rows, e.EnclosedOps)
+	if err != nil {
+		return err
+	}
+
+	scanArgs, scanValues, err := dbinfo.MakeScanBuf(rows)
+	if err != nil {
+		return err
+	}
+
+	log.Printf("[chunk:%02d]scan rows into buffer ...", e.ChunkSeq)
+	count := 0
+
+	for rows.Next() {
+		if err := rows.Scan(scanArgs...); err != nil {
+			return errors.WithStack(err)
+		}
+
+		// scan rows
+		for colIndex, col := range scanValues {
+			if colIndex > 0 {
+				// 写入列分隔符
+				e.OutFile.Write(file.FieldsTerminated)
+			}
+
+			if col == nil { // 字段为null的转义
+				e.OutFile.WriteSingleByte(file.FieldsEscaped)
+				e.OutFile.WriteSingleByte('N')
+				continue
+			}
+
+			// 写入前包裹符号
+			if isEnclosed[colIndex] && file.FieldsEnclosed > 0 {
+				e.OutFile.WriteSingleByte(file.FieldsEnclosed)
+			}
+			// 写入列值
+			// 针对该列的字段，只能针对字符类型
+			if isChar[colIndex] { // 是字符类型
+				for ii := range col {
+					if col[ii] == file.FieldsEscaped || col[ii] == file.FieldsEnclosed ||
+						col[ii] == file.LinesTerminated[0] || col[ii] == file.FieldsTerminated[0] {
+						e.OutFile.WriteSingleByte(file.FieldsEscaped)
+					}
+
+					e.OutFile.Write([]byte{col[ii]})
+				}
+			} else {
+				e.OutFile.Write(col)
+			}
+
+			// 写入后包裹符号
+			if isEnclosed[colIndex] && file.FieldsEnclosed > 0 {
+				e.OutFile.WriteSingleByte(file.FieldsEnclosed)
+			}
+		}
+
+		// 写入行分割符
+		e.OutFile.Write(file.LinesTerminated)
+
+		// 统一处理错误异常
+		if e.OutFile.Err != nil {
+			return errors.WithStack(e.OutFile.Err)
+		}
+
+		count++
+	}
+
+	if err := rows.Err(); err != nil {
+		return errors.WithStack(err)
+	}
+
+	log.Printf("[chunk:%02d]finished successfully, records:%d", e.ChunkSeq, count)
+
+	return nil
+}