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counter.go
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/
counter.go
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package restful
import (
"fmt"
"strings"
)
func PrepareCount(cfg Config, req Request, searchTarget string) (query string, args map[string]interface{}, err error) {
args = map[string]interface{}{}
// Add the fixed (or default) fields
if len(cfg.Fields) == 0 {
err = ErrNoFields
return
}
var filter string
if filter, err = prepareFilter(req.Filter, &args, cfg.Fields); err != nil {
return
}
var search string
if search, err = prepareSearch(cfg.Fields, &args, req.Search); err != nil {
return
}
// Merge the filter params and the custom ones
if cfg.AdditionalParams != nil {
for k, v := range cfg.AdditionalParams {
args[k] = v
}
}
// Build the query
query = "SELECT COUNT("
if cfg.Distinct && searchTarget != "*" {
query += "DISTINCT "
}
query = fmt.Sprintf("%s%s) FROM %s", query, searchTarget, cfg.Table)
//
// WHERE
//
requirements := []string{}
if len(cfg.Where) > 0 {
requirements = append(requirements, cfg.Where)
}
if len(filter) > 0 {
requirements = append(requirements, filter)
}
if len(search) > 0 {
requirements = append(requirements, search)
}
if len(requirements) > 0 {
query += " WHERE " + strings.Join(requirements, " AND ")
}
//
// GROUP
//
if len(cfg.GroupBy) > 0 {
query += fmt.Sprintf(" GROUP BY %s", cfg.GroupBy)
}
return query, args, nil
}