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column_type.qtpl
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column_type.qtpl
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{% package _go %}
{% import (
"github.com/iancoleman/strcase"
"github.com/ruslanBik4/dbEngine/dbEngine"
)
%}
{% code
type ColumnType struct {
name string
sName string
columns []dbEngine.Column
}
func NewColumnType(name, sName string, columns []dbEngine.Column) *ColumnType {
return &ColumnType{
name: name,
sName: sName,
columns: columns,
}
}
%}
{% func (c *ColumnType) ColumnType() %}
// {%s c.name %}PsqlType interface for reading data from psql connection
type (
{%s c.name %}PsqlType struct {
{%s c.name %}Fields
Status pgtype.Status
convertErrs []string
}
)
// GetFields implement dbEngine.RowScanner interface
func (r *{%s c.name %}PsqlType) GetFields(columns []dbEngine.Column) []any {
v := make([]any, len(columns))
for i, col := range columns {
switch name:= col.Name(); name {
case "{%s c.sName %}":
v[i] = r
default:
v[i] = r.RefColValue(name)
}
}
return v
}
// Set implement pgtype.Value interface
func (dst *{%s c.name %}PsqlType) Set(src any) error {
switch value := src.(type) {
// untyped nil and typed nil interfaces are different
case nil:
*dst = {%s c.name %}PsqlType{Status: pgtype.Null}
return nil
case {%s c.name %}PsqlType:
*dst = {%s c.name %}PsqlType{
{%s c.name %}Fields: value.{%s c.name %}Fields,
Status: pgtype.Present,
}
return nil
default:
return nil
}
}
// Get implement pgtype.Value interface
func (dst *{%s c.name %}PsqlType) Get() any {
switch dst.Status {
case pgtype.Present:
return *dst
case pgtype.Null:
return nil
default:
return dst.Status
}
}
// AssignTo implement pgtype.Value interface
func (src *{%s c.name %}PsqlType) AssignTo(dst any) error {
switch src.Status {
case pgtype.Present:
switch v := dst.(type) {
case *{%s c.name %}PsqlType:
(*v).{%s c.name %}Fields = src.{%s c.name %}Fields
return nil
default:
if nextDst, retry := pgtype.GetAssignToDstType(dst); retry {
return src.AssignTo(nextDst)
}
}
return nil
case pgtype.Null:
return pgtype.NullAssignTo(dst)
default:
return fmt.Errorf("cannot decode %v into %T", src, dst)
}
}
// DecodeText implement pgtype.TextDecoder interface
func (dst *{%s c.name %}PsqlType) DecodeText(ci *pgtype.ConnInfo, src []byte) error {
*dst = {%s c.name %}PsqlType{Status: pgtype.Null}
if len(src) == 0 {
return nil
}
c := pgtype.NewCompositeTextScanner(ci, src)
return dst.scanAll(c)
}
// DecodeBinary implement pgtype.DecodeBinary interface
func (dst *{%s c.name %}PsqlType) DecodeBinary(ci *pgtype.ConnInfo, src []byte) (err error) {
*dst = {%s c.name %}PsqlType{Status: pgtype.Null}
if len(src) == 0 {
return nil
}
c := pgtype.NewCompositeBinaryScanner(ci, src)
if err := dst.scanAll(c); err != nil {
dst.Status = pgtype.Undefined
return err
}
dst.Status = pgtype.Present
return nil
}
func (dst *{%s c.name %}Fields) scanAll(c scanError) error {
{%- for _, col := range c.columns -%}
c.ScanValue(&dst.{%s strcase.ToCamel(col.Name()) %})
if err := c.Err(); err != nil {
logs.ErrorLog(err, "{%s col.Name() %}")
return err
}
{%- endfor -%}
return nil
}
// New implement ValueDecoder[T any] interface
func (dst *{%s c.name %}Fields) New() *{%s c.name %}Fields{
return &{%s c.name %}Fields{}
}
// DecodeText implement pgtype.TextDecoder interface
func (dst *{%s c.name %}Fields) DecodeText(ci *pgtype.ConnInfo, src []byte) error {
*dst = {%s c.name %}Fields{}
c := pgtype.NewCompositeTextScanner(ci, src)
return dst.scanAll(c)
}
// DecodeText implement pgtype.TextDecoder interface
func (dst *{%s c.name %}Fields) DecodeBinary(ci *pgtype.ConnInfo, src []byte) error {
*dst = {%s c.name %}Fields{}
c := pgtype.NewCompositeBinaryScanner(ci, src)
return dst.scanAll(c)
}
{% endfunc %}