skeleton/internal/database/templates/postgres.type.go.tpl

{{- $short := (shortname .Name "err" "res" "sqlstr" "db" "XOLog") -}}
{{- $table := (schema .Schema .Table.TableName) -}}
{{- if .Comment -}}
// {{ .Comment }}
{{- else -}}
// {{ .Name }} represents a row from '{{ $table }}'.
{{- end }}
type {{ .Name }} struct {
{{- range .Fields }}
	{{ .Name }} {{ retype .Type }} `db:"{{ .Col.ColumnName }}"` // {{ .Col.ColumnName }}
{{- end }}
{{- if .PrimaryKey }}

	// xo fields
	_exists, _deleted bool
{{ end }}
}

{{ if .PrimaryKey }}
// Exists determines if the {{ .Name }} exists in the database.
func ({{ $short }} *{{ .Name }}) Exists() bool {
	return {{ $short }}._exists
}

// Deleted provides information if the {{ .Name }} has been deleted from the database.
func ({{ $short }} *{{ .Name }}) Deleted() bool {
	return {{ $short }}._deleted
}

// Insert inserts the {{ .Name }} to the database.
func ({{ $short }} *{{ .Name }}) Insert(db XODB) error {
	var err error

	// if already exist, bail
	if {{ $short }}._exists {
		return errors.New("insert failed: already exists")
	}

{{ if .Table.ManualPk }}
	// sql insert query, primary key must be provided
	const sqlstr = `INSERT INTO {{ $table }} (` +
		`{{ colnames .Fields }}` +
		`) VALUES (` +
		`{{ colvals .Fields }}` +
		`)`

	// run query
	XOLog(sqlstr, {{ fieldnames .Fields $short }})
	_, err = db.Exec(sqlstr, {{ fieldnames .Fields $short }})
	if err != nil {
		return err
	}
{{ else }}
	// sql insert query, primary key provided by sequence
	const sqlstr = `INSERT INTO {{ $table }} (` +
		`{{ colnames .Fields .PrimaryKey.Name }}` +
		`) VALUES (` +
		`{{ colvals .Fields .PrimaryKey.Name }}` +
		`) RETURNING {{ colname .PrimaryKey.Col }}`

	// run query
	XOLog(sqlstr, {{ fieldnames .Fields $short .PrimaryKey.Name }})
	err = db.QueryRow(sqlstr, {{ fieldnames .Fields $short .PrimaryKey.Name }}).Scan(&{{ $short }}.{{ .PrimaryKey.Name }})
	if err != nil {
		return err
	}
{{ end }}

	// set existence
	{{ $short }}._exists = true

	return nil
}

{{ if ne (fieldnamesmulti .Fields $short .PrimaryKeyFields) "" }}
	// Update updates the {{ .Name }} in the database.
	func ({{ $short }} *{{ .Name }}) Update(db XODB) error {
		var err error

		// if doesn't exist, bail
		if !{{ $short }}._exists {
			return errors.New("update failed: does not exist")
		}

		// if deleted, bail
		if {{ $short }}._deleted {
			return errors.New("update failed: marked for deletion")
		}

		{{ if gt ( len .PrimaryKeyFields ) 1 }}
			// sql query with composite primary key
			const sqlstr = `UPDATE {{ $table }} SET (` +
				`{{ colnamesmulti .Fields .PrimaryKeyFields }}` +
				`) = ( ` +
				`{{ colvalsmulti .Fields .PrimaryKeyFields }}` +
				`) WHERE {{ colnamesquerymulti .PrimaryKeyFields " AND " (getstartcount .Fields .PrimaryKeyFields) nil }}`

			// run query
			XOLog(sqlstr, {{ fieldnamesmulti .Fields $short .PrimaryKeyFields }}, {{ fieldnames .PrimaryKeyFields $short}})
			_, err = db.Exec(sqlstr, {{ fieldnamesmulti .Fields $short .PrimaryKeyFields }}, {{ fieldnames .PrimaryKeyFields $short}})
		return err
		{{- else }}
			// sql query
			const sqlstr = `UPDATE {{ $table }} SET (` +
				`{{ colnames .Fields .PrimaryKey.Name }}` +
				`) = ( ` +
				`{{ colvals .Fields .PrimaryKey.Name }}` +
				`) WHERE {{ colname .PrimaryKey.Col }} = ${{ colcount .Fields .PrimaryKey.Name }}`

			// run query
			XOLog(sqlstr, {{ fieldnames .Fields $short .PrimaryKey.Name }}, {{ $short }}.{{ .PrimaryKey.Name }})
			_, err = db.Exec(sqlstr, {{ fieldnames .Fields $short .PrimaryKey.Name }}, {{ $short }}.{{ .PrimaryKey.Name }})
			return err
		{{- end }}
	}

	// Save saves the {{ .Name }} to the database.
	func ({{ $short }} *{{ .Name }}) Save(db XODB) error {
		if {{ $short }}.Exists() {
			return {{ $short }}.Update(db)
		}

		return {{ $short }}.Insert(db)
	}

	// Upsert performs an upsert for {{ .Name }}.
	//
	// NOTE: PostgreSQL 9.5+ only
	func ({{ $short }} *{{ .Name }}) Upsert(db XODB) error {
		var err error

		// if already exist, bail
		if {{ $short }}._exists {
			return errors.New("insert failed: already exists")
		}

		// sql query
		const sqlstr = `INSERT INTO {{ $table }} (` +
			`{{ colnames .Fields }}` +
			`) VALUES (` +
			`{{ colvals .Fields }}` +
			`) ON CONFLICT ({{ colnames .PrimaryKeyFields }}) DO UPDATE SET (` +
			`{{ colnames .Fields }}` +
			`) = (` +
			`{{ colprefixnames .Fields "EXCLUDED" }}` +
			`)`

		// run query
		XOLog(sqlstr, {{ fieldnames .Fields $short }})
		_, err = db.Exec(sqlstr, {{ fieldnames .Fields $short }})
		if err != nil {
			return err
		}

		// set existence
		{{ $short }}._exists = true

		return nil
}
{{ else }}
	// Update statements omitted due to lack of fields other than primary key
{{ end }}

// Delete deletes the {{ .Name }} from the database.
func ({{ $short }} *{{ .Name }}) Delete(db XODB) error {
	var err error

	// if doesn't exist, bail
	if !{{ $short }}._exists {
		return nil
	}

	// if deleted, bail
	if {{ $short }}._deleted {
		return nil
	}

	{{ if gt ( len .PrimaryKeyFields ) 1 }}
		// sql query with composite primary key
		const sqlstr = `DELETE FROM {{ $table }}  WHERE {{ colnamesquery .PrimaryKeyFields " AND " }}`

		// run query
		XOLog(sqlstr, {{ fieldnames .PrimaryKeyFields $short }})
		_, err = db.Exec(sqlstr, {{ fieldnames .PrimaryKeyFields $short }})
		if err != nil {
			return err
		}
	{{- else }}
		// sql query
		const sqlstr = `DELETE FROM {{ $table }} WHERE {{ colname .PrimaryKey.Col }} = $1`

		// run query
		XOLog(sqlstr, {{ $short }}.{{ .PrimaryKey.Name }})
		_, err = db.Exec(sqlstr, {{ $short }}.{{ .PrimaryKey.Name }})
		if err != nil {
			return err
		}
	{{- end }}

	// set deleted
	{{ $short }}._deleted = true

	return nil
}
{{- end }}