How to Avoid SQLite3 Database Locks in Go?

SQLite3 Database Lock in Go

When working with SQLite3 databases in Go, developers may encounter the "database is locked" error. This typically occurs when multiple threads attempt to access the same database file simultaneously. However, even when only one connection is established in the code, additional database file handles can still be created.

In the provided code example, the database handle is created twice. First, in the getDatabaseHandle function, and then again in the dosomething function. This can lead to multiple database file handles being open simultaneously, resulting in the "database is locked" error.

To resolve this issue, defer the closing of the query results using defer. In the code example, modify the dosomething function as follows:

func dosomething(database *sql.DB, tx *sql.Tx) error {
    rows, err := database.Query("select * from sometable where name=?", "some")
    if err != nil {
        return err
    }
    defer rows.Close() // Defer closing the query results
    if rows.Next() {
        ...
    }
    // some insert queries
    tx.Commit()
}

By deferring the closing of the query results, Go will automatically close them once the function exits, ensuring that the database file handles are released properly.

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