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dialect.go
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dialect.go
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package gorp
import (
"errors"
"fmt"
"reflect"
"strings"
)
// The Dialect interface encapsulates behaviors that differ across
// SQL databases. At present the Dialect is only used by CreateTables()
// but this could change in the future
type Dialect interface {
// ToSqlType returns the SQL column type to use when creating a
// table of the given Go Type. maxsize can be used to switch based on
// size. For example, in MySQL []byte could map to BLOB, MEDIUMBLOB,
// or LONGBLOB depending on the maxsize
ToSqlType(val reflect.Type, maxsize int, isAutoIncr bool) string
// string to append to primary key column definitions
AutoIncrStr() string
AutoIncrBindValue() string
AutoIncrInsertSuffix(col *ColumnMap) string
// string to append to "create table" statement for vendor specific
// table attributes
CreateTableSuffix() string
InsertAutoIncr(exec SqlExecutor, insertSql string, params ...interface{}) (int64, error)
// bind variable string to use when forming SQL statements
// in many dbs it is "?", but Postgres appears to use $1
//
// i is a zero based index of the bind variable in this statement
//
BindVar(i int) string
// Handles quoting of a field name to ensure that it doesn't raise any
// SQL parsing exceptions by using a reserved word as a field name.
QuoteField(field string) string
}
func standardInsertAutoIncr(exec SqlExecutor, insertSql string, params ...interface{}) (int64, error) {
res, err := exec.Exec(insertSql, params...)
if err != nil {
return 0, err
}
return res.LastInsertId()
}
///////////////////////////////////////////////////////
// sqlite3 //
/////////////
type SqliteDialect struct {
suffix string
}
func (d SqliteDialect) ToSqlType(val reflect.Type, maxsize int, isAutoIncr bool) string {
switch val.Kind() {
case reflect.Int, reflect.Int16, reflect.Int32, reflect.Int64:
return "integer"
case reflect.Float64, reflect.Float32:
return "real"
case reflect.Slice:
if val.Elem().Kind() == reflect.Uint8 {
return "blob"
}
}
switch val.Name() {
case "NullableInt64":
return "integer"
case "NullableFloat64":
return "real"
case "NullableBool":
return "integer"
case "NullableBytes":
return "blob"
}
if maxsize < 1 {
maxsize = 255
}
return fmt.Sprintf("varchar(%d)", maxsize)
}
// Returns autoincrement
func (d SqliteDialect) AutoIncrStr() string {
return "autoincrement"
}
func (d SqliteDialect) AutoIncrBindValue() string {
return "null"
}
func (d SqliteDialect) AutoIncrInsertSuffix(col *ColumnMap) string {
return ""
}
// Returns suffix
func (d SqliteDialect) CreateTableSuffix() string {
return d.suffix
}
// Returns "?"
func (d SqliteDialect) BindVar(i int) string {
return "?"
}
func (d SqliteDialect) InsertAutoIncr(exec SqlExecutor, insertSql string, params ...interface{}) (int64, error) {
return standardInsertAutoIncr(exec, insertSql, params...)
}
func (d SqliteDialect) QuoteField(f string) string {
return `"` + f + `"`
}
///////////////////////////////////////////////////////
// PostgreSQL //
////////////////
type PostgresDialect struct {
suffix string
}
func (d PostgresDialect) ToSqlType(val reflect.Type, maxsize int, isAutoIncr bool) string {
switch val.Kind() {
case reflect.Int, reflect.Int16, reflect.Int32:
if isAutoIncr {
return "serial"
}
return "integer"
case reflect.Int64:
if isAutoIncr {
return "serial"
}
return "bigint"
case reflect.Float64, reflect.Float32:
return "real"
case reflect.Slice:
if val.Elem().Kind() == reflect.Uint8 {
return "bytea"
}
}
switch val.Name() {
case "NullableInt64":
return "bigint"
case "NullableFloat64":
return "double"
case "NullableBool":
return "smallint"
case "NullableBytes":
return "bytea"
}
if maxsize < 1 {
maxsize = 255
}
return fmt.Sprintf("varchar(%d)", maxsize)
}
// Returns empty string
func (d PostgresDialect) AutoIncrStr() string {
return ""
}
func (d PostgresDialect) AutoIncrBindValue() string {
return "default"
}
func (d PostgresDialect) AutoIncrInsertSuffix(col *ColumnMap) string {
return " returning " + col.ColumnName
}
// Returns suffix
func (d PostgresDialect) CreateTableSuffix() string {
return d.suffix
}
// Returns "$(i+1)"
func (d PostgresDialect) BindVar(i int) string {
return fmt.Sprintf("$%d", i+1)
}
func (d PostgresDialect) InsertAutoIncr(exec SqlExecutor, insertSql string, params ...interface{}) (int64, error) {
rows, err := exec.query(insertSql, params...)
if err != nil {
return 0, err
}
defer rows.Close()
if rows.Next() {
var id int64
err := rows.Scan(&id)
return id, err
}
return 0, errors.New("No serial value returned for insert: " + insertSql)
}
func (d PostgresDialect) QuoteField(f string) string {
return `"` + strings.ToLower(f) + `"`
}
///////////////////////////////////////////////////////
// MySQL //
///////////
// Implementation of Dialect for MySQL databases.
type MySQLDialect struct {
// Engine is the storage engine to use "InnoDB" vs "MyISAM" for example
Engine string
// Encoding is the character encoding to use for created tables
Encoding string
}
func (m MySQLDialect) ToSqlType(val reflect.Type, maxsize int, isAutoIncr bool) string {
switch val.Kind() {
case reflect.Int, reflect.Int16, reflect.Int32:
return "int"
case reflect.Int64:
return "bigint"
case reflect.Float64, reflect.Float32:
return "double"
case reflect.Slice:
if val.Elem().Kind() == reflect.Uint8 {
return "mediumblob"
}
}
switch val.Name() {
case "NullableInt64":
return "bigint"
case "NullableFloat64":
return "double"
case "NullableBool":
return "tinyint"
case "NullableBytes":
return "mediumblob"
}
if maxsize < 1 {
maxsize = 255
}
return fmt.Sprintf("varchar(%d)", maxsize)
}
// Returns auto_increment
func (m MySQLDialect) AutoIncrStr() string {
return "auto_increment"
}
func (m MySQLDialect) AutoIncrBindValue() string {
return "null"
}
func (m MySQLDialect) AutoIncrInsertSuffix(col *ColumnMap) string {
return ""
}
// Returns engine=%s charset=%s based on values stored on struct
func (m MySQLDialect) CreateTableSuffix() string {
return fmt.Sprintf(" engine=%s charset=%s", m.Engine, m.Encoding)
}
// Returns "?"
func (m MySQLDialect) BindVar(i int) string {
return "?"
}
func (m MySQLDialect) InsertAutoIncr(exec SqlExecutor, insertSql string, params ...interface{}) (int64, error) {
return standardInsertAutoIncr(exec, insertSql, params...)
}
func (d MySQLDialect) QuoteField(f string) string {
return "`" + f + "`"
}