我知道一次插入多个数据效率更高:
INSERT INTO test(n1, n2, n3)
VALUES(v1, v2, v3),(v4, v5, v6),(v7, v8, v9);
在golang 怎么做呢?
data := []map[string]string{
{"v1":"1", "v2":"1", "v3":"1"},
{"v1":"2", "v2":"2", "v3":"2"},
{"v1":"3", "v2":"3", "v3":"3"},
}
//I do not want to do it
for _, v := range data {
sqlStr := "INSERT INTO test(n1, n2, n3) VALUES(?, ?, ?)"
stmt, _ := db.Prepare(sqlStr)
res, _ := stmt.Exec(v["v1"], v["v2"], v["v3"])
}
用细绳拼接,但不太好.db.prepare更安全,对吗?
sqlStr := "INSERT INTO test(n1, n2, n3) VALUES"
for k, v := range data {
if k == 0 {
sqlStr += fmt.Sprintf("(%v, %v, %v)", v["v1"], v["v2"], v["v3"])
} else {
sqlStr += fmt.Sprintf(",(%v, %v, %v)", v["v1"], v["v2"], v["v3"])
}
}
res, _ := db.Exec(sqlStr)
我需要一个功能,更安全和有效的插入多个数据一次.