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db.go
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db.go
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package utils
import (
"fmt"
"reflect"
"strings"
"github.com/emvi/logbuch"
"gorm.io/gorm"
)
func IsCleanDB(db *gorm.DB) bool {
if db.Dialector.Name() == "sqlite" {
var count int64
if err := db.Raw("SELECT count(*) from sqlite_master WHERE type = 'table'").Scan(&count).Error; err != nil {
logbuch.Error("failed to check if database is clean - '%v'", err)
return false
}
return count == 0
}
logbuch.Warn("IsCleanDB is not yet implemented for dialect '%s'", db.Dialector.Name())
return false
}
func HasConstraints(db *gorm.DB) bool {
if db.Dialector.Name() == "sqlite" {
var count int64
if err := db.Raw("SELECT count(*) from sqlite_master WHERE sql LIKE '%CONSTRAINT%'").Scan(&count).Error; err != nil {
logbuch.Error("failed to check if database has constraints - '%v'", err)
return false
}
return count != 0
}
logbuch.Warn("HasForeignKeyConstraints is not yet implemented for dialect '%s'", db.Dialector.Name())
return false
}
func WhereNullable(query *gorm.DB, col string, val any) *gorm.DB {
if val == nil || reflect.ValueOf(val).IsNil() {
return query.Where(fmt.Sprintf("%s is null", col))
}
return query.Where(fmt.Sprintf("%s = ?", col), val)
}
func WithPaging(query *gorm.DB, limit, skip int) *gorm.DB {
if limit >= 0 {
query = query.Limit(limit)
}
if skip >= 0 {
query = query.Offset(skip)
}
return query
}
type stringWriter struct {
*strings.Builder
}
func (s stringWriter) WriteByte(c byte) error {
return s.Builder.WriteByte(c)
}
func (s stringWriter) WriteString(str string) (int, error) {
return s.Builder.WriteString(str)
}
// QuoteDbIdentifier quotes a column name used in a query.
func QuoteDbIdentifier(db *gorm.DB, identifier string) string {
builder := stringWriter{Builder: &strings.Builder{}}
db.Dialector.QuoteTo(builder, identifier)
return builder.Builder.String()
}
// QuoteSql quotes a SQL statement with the given identifiers.
func QuoteSql(db *gorm.DB, queryTemplate string, identifiers ...string) string {
quotedIdentifiers := make([]interface{}, len(identifiers))
for i, identifier := range identifiers {
quotedIdentifiers[i] = QuoteDbIdentifier(db, identifier)
}
return fmt.Sprintf(queryTemplate, quotedIdentifiers...)
}