单元测试代码：=运行时错误：无效的内存地址或零指针取消引用

Question

我已经创建了一个工作正常的 API，但出现了类似的错误运行时错误：无效的内存地址或零指针取消引用当执行单元测试代码时。完整回复供您参考runtime error: invalid memory address or nil pointer dereferenceD:/Go/src/runtime/panic.go:199 (0x447473)    panicmem: panic(memoryError)D:/Go/src/runtime/signal_windows.go:233 (0x447320)    sigpanic: panicmem()D:/Projects/GoLang/cloudfactory-backend/db/teams.go:11 (0xb49b36)    SelectAllTeams: func SelectAllTeams() (teams []models.Team, err error) {D:/Projects/GoLang/cloudfactory-backend/services/teams.go:11 (0xbb09ec)    GetTeams: teams, err = db.SelectAllTeams()D:/Projects/GoLang/cloudfactory-backend/controllers/api.go:32 (0xbb1b51)    ApiController.GetTeams: teams, err := services.GetTeams()C:/Users/justin.joseph/go/pkg/mod/github.com/gin-gonic/gin@v1.4.0/context.go:124 (0x9f7da1)    (*Context).Next: c.handlers[c.index](c)D:/Projects/GoLang/cloudfactory-backend/middlewares/db_logger.go:72 (0xc30430)    DBLogger.func1: c.Next()C:/Users/justin.joseph/go/pkg/mod/github.com/gin-gonic/gin@v1.4.0/context.go:124 (0x9f7da1)    (*Context).Next: c.handlers[c.index](c)C:/Users/justin.joseph/go/pkg/mod/github.com/gin-gonic/gin@v1.4.0/recovery.go:83 (0xa0b2ca)    RecoveryWithWriter.func1: c.Next()C:/Users/justin.joseph/go/pkg/mod/github.com/gin-gonic/gin@v1.4.0/context.go:124 (0x9f7da1)    (*Context).Next: c.handlers[c.index](c)C:/Users/justin.joseph/go/pkg/mod/github.com/gin-gonic/gin@v1.4.0/logger.go:240 (0xa0a357)    LoggerWithConfig.func1: c.Next()C:/Users/justin.joseph/go/pkg/mod/github.com/gin-gonic/gin@v1.4.0/context.go:124 (0x9f7da1)    (*Context).Next: c.handlers[c.index](c)C:/Users/justin.joseph/go/pkg/mod/github.com/gin-gonic/gin@v1.4.0/gin.go:389 (0xa01798)    (*Engine).handleHTTPRequest: c.Next() C:/Users/justin.joseph/go/pkg/mod/github.com/gin-gonic/gin@v1.4.0/gin.go:351 (0xa00fba)    (*Engine).ServeHTTP: engine.handleHTTPRequest(c)

Answer 1

在D:/Projects/GoLang/cloudfactory-backend/db/teams.go在线中11，您从零指针引用字段。如果没有完整的源代码（包括行号），就不可能精确定位，但它可能DBCon没有被初始化。