在go-sqlite3中快速，批量，insertmany构造？

I'd like to batch insert many items with the same prepared statement in sqlite3, using go-sqlite3.

I'm looking for something like the mongodb construct for inserting an array of the same type of records, with automatic transaction/batch handling.

I imagine something like the following:

type Rec struct {
  A string
  B string
}

db, err := sql.Open("sqlite3", "my.db")
checkErr(err)

stmt, err := db.Prepare("INSERT INTO Recs(a, b) values(?,?)")
checkErr(err)

R1 := Rec{"A":1,"B":2}
R2 := Rec{"A":3,"B":4} // in practice, some loop generates these...

Recs := []{R1,R2}

_, err = stmt.ExecMany(Recs)

Does this kind of syntax exist for sqlite?

I'm currently doing the following:

var Recs []Rec

batch := 0
for i:=0;i<100000; i++ {    
    R := Rec{"A":i,"B":i+1} 
    Recs = append(Recs, R)
    if (batch % 100) {
        tx, err := db.Begin()
        stmt, err := db.Prepare("INSERT INTO Recs(a, b) values(?,?)")
        for _, r := range Recs {
            _, err = stmt.Exec(r.A, r.B)
            checkErr(err)
        }
        err = tx.Commit()
        checkErr(err)
        Recs = Recs[0:0]
        batch = 1
    } else {
        batch = batch + 1
    }
}

but it is super slow, and I keep errorring out with errors like:

panic: database is locked.