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|
package acudego
import (
"database/sql"
"fmt"
"log"
"os"
"strings"
)
func createBulkInsertQuery(n int, start int) (string, []any) {
values := make([]string, n)
args := make([]any, n*2)
pos := 0
for i := 0; i < n; i++ {
values[i] = "(?, ?)"
args[pos] = start + i
args[pos+1] = fmt.Sprintf("こんにちは世界%03d", i)
pos += 2
}
query := fmt.Sprintf(
"insert into mylimittable(id, name) values %s",
strings.Join(values, ", "),
)
return query, args
}
func bulkInsert(db *sql.DB, query string, args []any) error {
stmt, err := db.Prepare(query)
if err != nil {
return err
}
_, err = stmt.Exec(args...)
return err
}
func MainTest() {
const (
num = 400
smallLimit = 100
bigLimit = 999999
)
const SQL = `
create table mylimittable (id integer not null primary key, name text);
delete from mylimittable;
`
var conn *SQLiteConn
sql.Register("sqlite3_with_limit", &SQLiteDriver{
ConnectHook: func(c *SQLiteConn) error {
conn = c
return nil
},
})
os.Remove("limit.db")
defer os.Remove("limit.db")
db, err := sql.Open("sqlite3_with_limit", "limit.db")
if err != nil {
log.Fatal(err)
}
defer db.Close()
_, err = db.Exec(SQL)
if err != nil {
log.Fatal(err)
}
if conn == nil {
log.Fatal("not set sqlite3 connection")
}
{
query, args := createBulkInsertQuery(num, 0)
err := bulkInsert(db, query, args)
if err != nil {
log.Fatal(err)
}
}
conn.SetLimit(SQLITE_LIMIT_VARIABLE_NUMBER, smallLimit)
{
query, args := createBulkInsertQuery(num, num)
err := bulkInsert(db, query, args)
if err == nil {
log.Fatal("expected failure didn't happen")
}
}
conn.SetLimit(SQLITE_LIMIT_VARIABLE_NUMBER, bigLimit)
{
query, args := createBulkInsertQuery(500, num+num)
err := bulkInsert(db, query, args)
if err != nil {
log.Fatal(err)
}
}
}
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