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// Copyright 2012 James Cooper. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
// Package gorp provides a simple way to marshal Go structs to and from
// SQL databases. It uses the database/sql package, and should work with any
// compliant database/sql driver.
//
// Source code and project home:
// https://github.com/go-gorp/gorp
package gorp
import (
"fmt"
"reflect"
"strings"
)
// Implementation of Dialect for Microsoft SQL Server databases.
// Use gorp.SqlServerDialect{"2005"} for legacy datatypes.
// Tested with driver: github.com/denisenkom/go-mssqldb
type SqlServerDialect struct {
// If set to "2005" legacy datatypes will be used
Version string
}
func (d SqlServerDialect) ToSqlType(val reflect.Type, maxsize int, isAutoIncr bool) string {
switch val.Kind() {
case reflect.Ptr:
return d.ToSqlType(val.Elem(), maxsize, isAutoIncr)
case reflect.Bool:
return "bit"
case reflect.Int8:
return "tinyint"
case reflect.Uint8:
return "smallint"
case reflect.Int16:
return "smallint"
case reflect.Uint16:
return "int"
case reflect.Int, reflect.Int32:
return "int"
case reflect.Uint, reflect.Uint32:
return "bigint"
case reflect.Int64:
return "bigint"
case reflect.Uint64:
return "numeric(20,0)"
case reflect.Float32:
return "float(24)"
case reflect.Float64:
return "float(53)"
case reflect.Slice:
if val.Elem().Kind() == reflect.Uint8 {
return "varbinary"
}
}
switch val.Name() {
case "NullInt64":
return "bigint"
case "NullFloat64":
return "float(53)"
case "NullBool":
return "bit"
case "NullTime", "Time":
if d.Version == "2005" {
return "datetime"
}
return "datetime2"
}
if maxsize < 1 {
if d.Version == "2005" {
maxsize = 255
} else {
return fmt.Sprintf("nvarchar(max)")
}
}
return fmt.Sprintf("nvarchar(%d)", maxsize)
}
// Returns auto_increment
func (d SqlServerDialect) AutoIncrStr() string {
return "identity(0,1)"
}
// Empty string removes autoincrement columns from the INSERT statements.
func (d SqlServerDialect) AutoIncrBindValue() string {
return ""
}
func (d SqlServerDialect) AutoIncrInsertSuffix(col *ColumnMap) string {
return ""
}
func (d SqlServerDialect) CreateTableSuffix() string { return ";" }
func (d SqlServerDialect) TruncateClause() string {
return "truncate table"
}
// Returns "?"
func (d SqlServerDialect) BindVar(i int) string {
return "?"
}
func (d SqlServerDialect) InsertAutoIncr(exec SqlExecutor, insertSql string, params ...interface{}) (int64, error) {
return standardInsertAutoIncr(exec, insertSql, params...)
}
func (d SqlServerDialect) QuoteField(f string) string {
return "[" + strings.Replace(f, "]", "]]", -1) + "]"
}
func (d SqlServerDialect) QuotedTableForQuery(schema string, table string) string {
if strings.TrimSpace(schema) == "" {
return d.QuoteField(table)
}
return d.QuoteField(schema) + "." + d.QuoteField(table)
}
func (d SqlServerDialect) QuerySuffix() string { return ";" }
func (d SqlServerDialect) IfSchemaNotExists(command, schema string) string {
s := fmt.Sprintf("if schema_id(N'%s') is null %s", schema, command)
return s
}
func (d SqlServerDialect) IfTableExists(command, schema, table string) string {
var schema_clause string
if strings.TrimSpace(schema) != "" {
schema_clause = fmt.Sprintf("%s.", d.QuoteField(schema))
}
s := fmt.Sprintf("if object_id('%s%s') is not null %s", schema_clause, d.QuoteField(table), command)
return s
}
func (d SqlServerDialect) IfTableNotExists(command, schema, table string) string {
var schema_clause string
if strings.TrimSpace(schema) != "" {
schema_clause = fmt.Sprintf("%s.", schema)
}
s := fmt.Sprintf("if object_id('%s%s') is null %s", schema_clause, table, command)
return s
}
func (d SqlServerDialect) CreateIndexSuffix() string { return "" }
func (d SqlServerDialect) DropIndexSuffix() string { return "" }
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