114 lines
2.6 KiB
Go
114 lines
2.6 KiB
Go
package main
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import (
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"database/sql"
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"fmt"
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"log"
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"os"
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"strings"
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"github.com/mattn/go-sqlite3"
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)
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func createBulkInsertQuery(n int, start int) (query string, args []interface{}) {
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values := make([]string, n)
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args = make([]interface{}, n*2)
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pos := 0
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for i := 0; i < n; i++ {
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values[i] = "(?, ?)"
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args[pos] = start + i
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args[pos+1] = fmt.Sprintf("こんにちわ世界%03d", i)
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pos += 2
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}
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query = fmt.Sprintf(
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"insert into foo(id, name) values %s",
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strings.Join(values, ", "),
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)
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return
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}
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func bulkInsert(db *sql.DB, query string, args []interface{}) (err error) {
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stmt, err := db.Prepare(query)
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if err != nil {
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return
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}
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_, err = stmt.Exec(args...)
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if err != nil {
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return
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}
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return
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}
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func main() {
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var sqlite3conn *sqlite3.SQLiteConn
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sql.Register("sqlite3_with_limit", &sqlite3.SQLiteDriver{
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ConnectHook: func(conn *sqlite3.SQLiteConn) error {
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sqlite3conn = conn
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return nil
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},
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})
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os.Remove("./foo.db")
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db, err := sql.Open("sqlite3_with_limit", "./foo.db")
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if err != nil {
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log.Fatal(err)
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}
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defer db.Close()
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sqlStmt := `
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create table foo (id integer not null primary key, name text);
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delete from foo;
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`
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_, err = db.Exec(sqlStmt)
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if err != nil {
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log.Printf("%q: %s\n", err, sqlStmt)
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return
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}
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if sqlite3conn == nil {
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log.Fatal("not set sqlite3 connection")
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}
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limitVariableNumber := sqlite3conn.GetLimit(sqlite3.SQLITE_LIMIT_VARIABLE_NUMBER)
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log.Printf("default SQLITE_LIMIT_VARIABLE_NUMBER: %d", limitVariableNumber)
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num := 400
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query, args := createBulkInsertQuery(num, 0)
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err = bulkInsert(db, query, args)
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if err != nil {
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log.Fatal(err)
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}
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smallLimitVariableNumber := 100
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sqlite3conn.SetLimit(sqlite3.SQLITE_LIMIT_VARIABLE_NUMBER, smallLimitVariableNumber)
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limitVariableNumber = sqlite3conn.GetLimit(sqlite3.SQLITE_LIMIT_VARIABLE_NUMBER)
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log.Printf("updated SQLITE_LIMIT_VARIABLE_NUMBER: %d", limitVariableNumber)
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query, args = createBulkInsertQuery(num, num)
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err = bulkInsert(db, query, args)
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if err != nil {
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if err != nil {
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log.Printf("expect failed since SQLITE_LIMIT_VARIABLE_NUMBER is too small: %v", err)
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}
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}
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bigLimitVariableNumber := 999999
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sqlite3conn.SetLimit(sqlite3.SQLITE_LIMIT_VARIABLE_NUMBER, bigLimitVariableNumber)
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limitVariableNumber = sqlite3conn.GetLimit(sqlite3.SQLITE_LIMIT_VARIABLE_NUMBER)
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log.Printf("set SQLITE_LIMIT_VARIABLE_NUMBER: %d", bigLimitVariableNumber)
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log.Printf("updated SQLITE_LIMIT_VARIABLE_NUMBER: %d", limitVariableNumber)
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query, args = createBulkInsertQuery(500, num+num)
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err = bulkInsert(db, query, args)
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if err != nil {
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if err != nil {
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log.Fatal(err)
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}
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}
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log.Println("no error if SQLITE_LIMIT_VARIABLE_NUMBER > 999")
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}
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