How to Count Rows in a Database Using Go?-Golang-php.cn

How to Count Rows in a Database Using Go?

Linda Hamilton

Release： 2024-11-05 18:20:02

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How to Count Rows in a Database Using Go?

Count Number of Rows in a Database Using Go

In Go, to display the number of rows from a database, a common approach is to use the Query() function in the database/sql package. This function executes a query and returns a Result object, which can be iterated over to access the rows returned by the query.

To count the number of rows, you can use the following steps:

<code class="go">// Execute the query to retrieve row count
rows, err := db.Query("SELECT COUNT(*) FROM main_table")
if err != nil {
    log.Fatal(err)
}
defer rows.Close()

// Initialize a variable to store the count
var count int

// Loop through the rows
for rows.Next() {
    // Read the count into the variable
    if err := rows.Scan(&count); err != nil {
        log.Fatal(err)
    }
}

fmt.Printf("Number of rows are %s\n", count)</code>

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For greater efficiency, you can use the QueryRow() function if you only expect to retrieve a single row, like this:

<code class="go">var count int

err := db.QueryRow("SELECT COUNT(*) FROM main_table").Scan(&count)
switch {
case err != nil:
    log.Fatal(err)
default:
    fmt.Printf("Number of rows are %s\n", count)
}</code>

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