From deb603caacaad3776196476493db410bd7df57d4 Mon Sep 17 00:00:00 2001
From: Dmitry Anderson <4nd3r5z0n@gmail.com>
Date: Wed, 13 Nov 2024 17:54:19 +0100
Subject: [PATCH] new pg utils features

---
 lecense.txt => license.txt |  0
 pg/pg.go                   | 61 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 61 insertions(+)
 rename lecense.txt => license.txt (100%)

diff --git a/lecense.txt b/license.txt
similarity index 100%
rename from lecense.txt
rename to license.txt
diff --git a/pg/pg.go b/pg/pg.go
index 3d92b49..517a31b 100644
--- a/pg/pg.go
+++ b/pg/pg.go
@@ -2,13 +2,18 @@ package pgUtils
 
 import (
 	"context"
+	"fmt"
 	"github.com/jackc/pgx/v5"
+	"github.com/jackc/pgx/v5/pgconn"
 	"github.com/jackc/pgx/v5/pgxpool"
 	"github.com/matchsystems/werr"
+	"strings"
 )
 
 type PgxQuerier interface {
 	Query(ctx context.Context, sql string, args ...any) (pgx.Rows, error)
+	QueryRow(ctx context.Context, sql string, args ...any) pgx.Row
+	Exec(ctx context.Context, sql string, args ...any) (pgconn.CommandTag, error)
 }
 
 // Query executes query on a provided querier and tries to parse db response
@@ -48,3 +53,59 @@ func Tx(ctx context.Context, db *pgxpool.Pool, exec func(ctx context.Context, tx
 	}
 	return tx.Commit(ctx)
 }
+
+// SqlInsertMultiple Returns an SQL query to insert multiple items into a table
+func SqlInsertMultiple(tableName string, columnNames []string, itemsCount int) string {
+	columnsCount := len(columnNames)
+	query := strings.Builder{}
+	query.WriteString("INSERT INTO ")
+	query.WriteString(tableName)
+	query.WriteString(" (")
+	query.WriteString(strings.Join(columnNames, ","))
+	query.WriteString(") VALUES ")
+
+	for item := 0; item < itemsCount; item++ {
+		query.WriteByte('(')
+		for column := 0; column < columnsCount; column++ {
+			query.WriteString(fmt.Sprintf("$%d", item*columnsCount+column))
+			if column != columnsCount-1 {
+				query.WriteString(", ")
+			}
+		}
+		query.WriteByte(')')
+		if item != itemsCount-1 {
+			query.WriteByte(',')
+		}
+	}
+
+	return query.String()
+}
+
+// InsertMultiple Inserts multiple items into a specified table
+func InsertMultiple(ctx context.Context, db PgxQuerier, tableName string, columnNames []string, items [][]any) (pgconn.CommandTag, error) {
+	query := SqlInsertMultiple(tableName, columnNames, len(items))
+	itemsJoined := make([]any, 0)
+	for _, item := range items {
+		itemsJoined = append(itemsJoined, item...)
+	}
+	return db.Exec(ctx, query, itemsJoined...)
+}
+
+// SqlOrder returns "ASC" | "DESC"
+// depending on asc param
+func SqlOrder(asc bool) string {
+	if asc {
+		return "ASC"
+	}
+	return "DESC"
+}
+
+func SqlOrderLimit(orderBy string, asc bool, limit int64, offset int64) string {
+	query := strings.Builder{}
+	query.WriteString("ORDER BY ")
+	query.WriteString(orderBy)
+	query.WriteByte(' ')
+	query.WriteString(SqlOrder(asc))
+	query.WriteString(fmt.Sprintf("LIMIT %d OFFSET %d", limit, offset))
+	return query.String()
+}