147 lines
3.4 KiB
Go
147 lines
3.4 KiB
Go
// Copyright 2012 James Cooper. All rights reserved.
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// Use of this source code is governed by a MIT-style
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// license that can be found in the LICENSE file.
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// Package gorp provides a simple way to marshal Go structs to and from
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// SQL databases. It uses the database/sql package, and should work with any
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// compliant database/sql driver.
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//
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// Source code and project home:
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// https://github.com/go-gorp/gorp
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//
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package gorp
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import (
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"fmt"
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"reflect"
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"strings"
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)
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type PostgresDialect struct {
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suffix string
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}
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func (d PostgresDialect) QuerySuffix() string { return ";" }
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func (d PostgresDialect) ToSqlType(val reflect.Type, maxsize int, isAutoIncr bool) string {
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switch val.Kind() {
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case reflect.Ptr:
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return d.ToSqlType(val.Elem(), maxsize, isAutoIncr)
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case reflect.Bool:
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return "boolean"
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case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32:
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if isAutoIncr {
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return "serial"
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}
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return "integer"
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case reflect.Int64, reflect.Uint64:
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if isAutoIncr {
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return "bigserial"
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}
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return "bigint"
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case reflect.Float64:
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return "double precision"
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case reflect.Float32:
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return "real"
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case reflect.Slice:
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if val.Elem().Kind() == reflect.Uint8 {
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return "bytea"
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}
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}
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switch val.Name() {
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case "NullInt64":
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return "bigint"
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case "NullFloat64":
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return "double precision"
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case "NullBool":
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return "boolean"
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case "Time", "NullTime":
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return "timestamp with time zone"
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}
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if maxsize > 0 {
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return fmt.Sprintf("varchar(%d)", maxsize)
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} else {
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return "text"
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}
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}
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// Returns empty string
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func (d PostgresDialect) AutoIncrStr() string {
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return ""
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}
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func (d PostgresDialect) AutoIncrBindValue() string {
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return "default"
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}
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func (d PostgresDialect) AutoIncrInsertSuffix(col *ColumnMap) string {
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return " returning " + col.ColumnName
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}
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// Returns suffix
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func (d PostgresDialect) CreateTableSuffix() string {
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return d.suffix
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}
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func (d PostgresDialect) CreateIndexSuffix() string {
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return "using"
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}
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func (d PostgresDialect) DropIndexSuffix() string {
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return ""
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}
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func (d PostgresDialect) TruncateClause() string {
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return "truncate"
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}
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// Returns "$(i+1)"
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func (d PostgresDialect) BindVar(i int) string {
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return fmt.Sprintf("$%d", i+1)
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}
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func (d PostgresDialect) InsertAutoIncrToTarget(exec SqlExecutor, insertSql string, target interface{}, params ...interface{}) error {
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rows, err := exec.query(insertSql, params...)
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if err != nil {
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return err
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}
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defer rows.Close()
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if !rows.Next() {
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return fmt.Errorf("No serial value returned for insert: %s Encountered error: %s", insertSql, rows.Err())
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}
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if err := rows.Scan(target); err != nil {
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return err
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}
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if rows.Next() {
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return fmt.Errorf("more than two serial value returned for insert: %s", insertSql)
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}
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return rows.Err()
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}
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func (d PostgresDialect) QuoteField(f string) string {
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return `"` + strings.ToLower(f) + `"`
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}
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func (d PostgresDialect) QuotedTableForQuery(schema string, table string) string {
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if strings.TrimSpace(schema) == "" {
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return d.QuoteField(table)
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}
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return schema + "." + d.QuoteField(table)
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}
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func (d PostgresDialect) IfSchemaNotExists(command, schema string) string {
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return fmt.Sprintf("%s if not exists", command)
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}
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func (d PostgresDialect) IfTableExists(command, schema, table string) string {
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return fmt.Sprintf("%s if exists", command)
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}
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func (d PostgresDialect) IfTableNotExists(command, schema, table string) string {
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return fmt.Sprintf("%s if not exists", command)
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}
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