feat(db): 添加对达梦数据库的支持

- 在应用程序中新增对达梦数据库（DM）的配置和连接支持 - 实现 SetDmDB 函数以配置达梦数据库连接 - 更新数据库操作逻辑，支持达梦特有的 SQL 语法和功能 - 在相关文件中添加达梦数据库的处理逻辑，包括表创建、数据插入和查询 - 更新 go.mod 和 go.sum 文件以引入达梦数据库驱动 - 增强文档，详细说明达梦数据库的配置和使用方法
2026-03-20 10:46:51 +08:00
parent 1546967918
commit 7f7b585ffb
194 changed files with 211502 additions and 2328 deletions
@@ -0,0 +1,124 @@
+/*
+ * Copyright (c) 2000-2018, 达梦数据库有限公司.
+ * All rights reserved.
+ */
+package dm
+
+import (
+	"fmt"
+	"os"
+	"strconv"
+	"strings"
+	"time"
+
+	"gitee.com/chunanyong/dm/util"
+)
+
+const (
+	MAX_FILE_SIZE = 100 * 1024 * 1024
+	FLUSH_SIZE    = 32 * 1024
+)
+
+type goRun interface {
+	doRun()
+}
+
+type logWriter struct {
+	flushQueue chan []byte
+	date       string
+	logFile    *os.File
+	flushFreq  int
+	filePath   string
+	filePrefix string
+	buffer     *Dm_build_0
+}
+
+func (lw *logWriter) doRun() {
+	defer func() {
+		lw.beforeExit()
+		lw.closeCurrentFile()
+	}()
+
+	i := 0
+	for {
+		var ibytes []byte
+
+		select {
+		case ibytes = <-lw.flushQueue:
+			if LogLevel != LOG_OFF {
+				if i == LogFlushQueueSize {
+					lw.doFlush(lw.buffer)
+					i = 0
+				} else {
+					lw.buffer.Dm_build_26(ibytes, 0, len(ibytes))
+					i++
+				}
+			}
+		case <-time.After(time.Duration(LogFlushFreq) * time.Millisecond):
+			if LogLevel != LOG_OFF && lw.buffer.Dm_build_5() > 0 {
+				lw.doFlush(lw.buffer)
+				i = 0
+			}
+
+		}
+
+	}
+}
+
+func (lw *logWriter) doFlush(buffer *Dm_build_0) {
+	if lw.needCreateNewFile() {
+		lw.closeCurrentFile()
+		lw.logFile = lw.createNewFile()
+	}
+	if lw.logFile != nil {
+		buffer.Dm_build_20(lw.logFile, buffer.Dm_build_5())
+	}
+}
+func (lw *logWriter) closeCurrentFile() {
+	if lw.logFile != nil {
+		lw.logFile.Close()
+		lw.logFile = nil
+	}
+}
+func (lw *logWriter) createNewFile() *os.File {
+	lw.date = time.Now().Format("2006-01-02")
+	fileName := lw.filePrefix + "_" + lw.date + "_" + strconv.Itoa(time.Now().Nanosecond()) + ".log"
+	lw.filePath = LogDir
+	if len(lw.filePath) > 0 {
+		if _, err := os.Stat(lw.filePath); err != nil {
+			os.MkdirAll(lw.filePath, 0755)
+		}
+		if _, err := os.Stat(lw.filePath + fileName); err != nil {
+			logFile, err := os.Create(lw.filePath + fileName)
+			if err != nil {
+				fmt.Println(err)
+				return nil
+			}
+			return logFile
+		}
+	}
+	return nil
+}
+func (lw *logWriter) needCreateNewFile() bool {
+	now := time.Now().Format("2006-01-02")
+	fileInfo, err := lw.logFile.Stat()
+	return now != lw.date || err != nil || lw.logFile == nil || fileInfo.Size() > int64(MAX_FILE_SIZE)
+}
+func (lw *logWriter) beforeExit() {
+	close(lw.flushQueue)
+	var ibytes []byte
+	for ibytes = <-lw.flushQueue; ibytes != nil; ibytes = <-lw.flushQueue {
+		lw.buffer.Dm_build_26(ibytes, 0, len(ibytes))
+		if lw.buffer.Dm_build_5() >= LogBufferSize {
+			lw.doFlush(lw.buffer)
+		}
+	}
+	if lw.buffer.Dm_build_5() > 0 {
+		lw.doFlush(lw.buffer)
+	}
+}
+
+func (lw *logWriter) WriteLine(msg string) {
+	var b = []byte(strings.TrimSpace(msg) + util.LINE_SEPARATOR)
+	lw.flushQueue <- b
+}