jlelse
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GoBlog
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Improve post counting

This commit is contained in:
Jan-Lukas Else 2020-10-17 20:22:00 +02:00
parent 92e508d5cf
commit 1a3178eea7
1 changed files with 20 additions and 14 deletions
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34
posts.go
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@ -2,7 +2,6 @@ package main
import (
"context"
"database/sql"
"errors"
"fmt"
"net/http"
@ -240,10 +239,8 @@ type postsRequestConfig struct {
parameterValue string
}
func getPosts(context context.Context, config *postsRequestConfig) (posts []*post, err error) {
paths := make(map[string]int)
var rows *sql.Rows
defaultSelection := "select p.path, coalesce(content, ''), coalesce(published, ''), coalesce(updated, ''), coalesce(blog, ''), coalesce(section, ''), coalesce(parameter, ''), coalesce(value, '') "
func buildQuery(config *postsRequestConfig) (query string, params []interface{}) {
defaultSelection := "select p.path as path, coalesce(content, ''), coalesce(published, ''), coalesce(updated, ''), coalesce(blog, ''), coalesce(section, ''), coalesce(parameter, ''), coalesce(value, '') "
postsTable := "posts"
if config.blog != "" {
postsTable = "(select * from " + postsTable + " where blog = '" + config.blog + "')"
@ -271,21 +268,27 @@ func getPosts(context context.Context, config *postsRequestConfig) (posts []*pos
defaultTables := " from " + postsTable + " p left outer join post_parameters pp on p.path = pp.path "
defaultSorting := " order by p.published desc "
if config.path != "" {
query := defaultSelection + defaultTables + " where p.path=?" + defaultSorting
rows, err = appDb.QueryContext(context, query, config.path)
query = defaultSelection + defaultTables + " where p.path=?" + defaultSorting
params = []interface{}{config.path}
} else if config.limit != 0 || config.offset != 0 {
query := defaultSelection + " from (select * from " + postsTable + " p " + defaultSorting + " limit ? offset ?) p left outer join post_parameters pp on p.path = pp.path "
rows, err = appDb.QueryContext(context, query, config.limit, config.offset)
query = defaultSelection + " from (select * from " + postsTable + " p " + defaultSorting + " limit ? offset ?) p left outer join post_parameters pp on p.path = pp.path "
params = []interface{}{config.limit, config.offset}
} else {
query := defaultSelection + defaultTables + defaultSorting
rows, err = appDb.QueryContext(context, query)
query = defaultSelection + defaultTables + defaultSorting
}
return
}
func getPosts(context context.Context, config *postsRequestConfig) (posts []*post, err error) {
query, queryParams := buildQuery(config)
rows, err := appDb.QueryContext(context, query, queryParams...)
if err != nil {
return nil, err
}
defer func() {
_ = rows.Close()
}()
paths := make(map[string]int)
for rows.Next() {
p := &post{}
var parameterName, parameterValue string
@ -306,9 +309,12 @@ func getPosts(context context.Context, config *postsRequestConfig) (posts []*pos
return posts, nil
}
func countPosts(context context.Context, config *postsRequestConfig) (int, error) {
posts, err := getPosts(context, config)
return len(posts), err
func countPosts(context context.Context, config *postsRequestConfig) (count int, err error) {
query, params := buildQuery(config)
query = "select count(distinct path) from (" + query + ")"
row := appDb.QueryRowContext(context, query, params...)
err = row.Scan(&count)
return
}
func allPostPaths() ([]string, error) {