73 lines
2.2 KiB
Go
73 lines
2.2 KiB
Go
package ai
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import (
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"fmt"
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"strings"
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)
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// schemaContextCap 注入给模型的库表结构上下文长度上限。
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const schemaContextCap = 4000
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// BuildMessages 按 action 选 system 模板装配对话;req.Schema 非空时注入库表列上下文。
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func BuildMessages(req ChatReq) []Message {
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driver := req.Driver
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if driver == "" {
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driver = "mysql"
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}
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sys := "你是资深数据库工程师助手,服务于数据库客户端 OpsxDB。回答使用中文,SQL 代码放在 ```sql 代码块中。"
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var task string
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switch strings.ToLower(req.Action) {
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case "generate", "ask":
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task = fmt.Sprintf("根据用户描述生成一条 %s 方言的 SQL。只输出可执行 SQL 与极简说明。", driver)
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case "explain":
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task = "逐部分解释用户给出的 SQL:访问路径、索引使用、潜在代价。"
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case "optimize":
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task = "审查用户给出的 SQL 并给出优化版本:索引建议、重写建议、说明理由。"
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case "fix":
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task = "根据报错信息修复用户给出的 SQL,指出错误原因并给出修正后的完整 SQL。"
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case "dialect":
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task = fmt.Sprintf("把用户给出的 SQL 转换为 %s 方言,保持语义一致。", driver)
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case "sample":
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task = "为当前库生成一条有代表性的示例查询 SQL。"
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default:
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task = "回答用户关于数据库 / SQL 的问题。"
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}
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var sb strings.Builder
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sb.WriteString(sys)
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sb.WriteString("\n")
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sb.WriteString(task)
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if req.Database != "" {
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sb.WriteString(fmt.Sprintf("\n当前数据库: %s(%s)", req.Database, driver))
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}
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if s := strings.TrimSpace(req.Schema); s != "" {
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if len(s) > schemaContextCap {
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s = s[:schemaContextCap]
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}
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sb.WriteString("\n当前数据库结构:\n")
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sb.WriteString(s)
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}
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var user strings.Builder
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if p := strings.TrimSpace(req.Prompt); p != "" {
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user.WriteString(p)
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}
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if s := strings.TrimSpace(req.SQL); s != "" {
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if user.Len() > 0 {
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user.WriteString("\n\n")
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}
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user.WriteString("SQL:\n")
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user.WriteString(s)
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}
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if e := strings.TrimSpace(req.Error); e != "" {
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user.WriteString("\n\n报错:\n")
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user.WriteString(e)
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}
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if user.Len() == 0 {
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user.WriteString("你好")
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}
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return []Message{
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{Role: "system", Content: sb.String()},
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{Role: "user", Content: user.String()},
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}
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}
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