How to debug Golang database connection?

Use the log package and pprof tool to debug database connection problems in the Go language. log only logs connection attempts and errors, while pprof generates a more in-depth performance analysis report that can be used to pinpoint database-related functionality. Demonstrated through practical cases, these methods can quickly resolve common database connection errors, including file non-existence and connection refused.

How to debug Golang database connections

In Go, debugging database connection issues is a common task. This article will guide you on how to use debugging techniques to pinpoint and resolve database connection-related issues.

Using the log package

One of the simplest methods is to use the log package to log database connection attempts and encounters Any errors encountered:

import (
    "context"
    "fmt"
    "log"

    "github.com/jackc/pgx/v4"
)

func main() {
    conn, err := pgx.Connect(context.Background(), "user=postgres password=secret dbname=my-database")
    if err != nil {
        log.Fatalf("连接到数据库失败: %v", err)
    }
    _ = conn // 防止编译器抱怨未使用变量
}

Run this code and if any connection errors are encountered, they will be printed to the standard output in red.

Using the pprof tool

For more in-depth debugging, you can use the pprof tool, which can generate a performance analysis Report.

To use pprof, first compile your program and enable debugging information:

go build -gcflags="all=-N -l"

Then, follow these steps:

1. Run your program, then terminate it when it exits with an error.
2. Use pprof to analyze the heap dump: pprof x :.pprof
3. Type ## in the pprof interactive shell #top, find the functions related to database connection.

Practical Case

Let us illustrate how to use these methods through a practical case.

Error: no such file or directory

Error message:

setupConnect: sql: open /Users/myuser/go/bin/data/secrets.db: no such file or directory

Debugging:

Using the

log package, we can see that the connection attempt failed when opening the file containing the database credentials. Check whether the file path is correct or make sure the file exists.

Error: dial tcp 127.0.0.1:5432: connect: connection refused

Error message:

setupConnect: dial tcp 127.0.0.1:5432: connect: connection refused

Debug:

Using

pprof we can see that the connection attempt is trying to connect to port# on 127.0.0.1 ##5432, but failed. Just check whether the database server is running and whether the port is correct. By using these debugging techniques, you can quickly pinpoint and resolve database connection issues, making your Golang applications more reliable.

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