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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 "reflect"
// 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 {
// dialect name
Name() string
// adds a suffix to any query, usually ";"
QuerySuffix() string
// 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
// string to bind autoincrement columns to. Empty string will
// remove reference to those columns in the INSERT statement.
AutoIncrBindValue() string
AutoIncrInsertSuffix(col *ColumnMap) string
// string to append to "create table" statement for vendor specific
// table attributes
CreateTableSuffix() string
// string to append to "create index" statement
CreateIndexSuffix() string
// string to append to "drop index" statement
DropIndexSuffix() string
// string to truncate tables
TruncateClause() string
// 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
// Handles building up of a schema.database string that is compatible with
// the given dialect
//
// schema - The schema that <table> lives in
// table - The table name
QuotedTableForQuery(schema string, table string) string
// Existance clause for table creation / deletion
IfSchemaNotExists(command, schema string) string
IfTableExists(command, schema, table string) string
IfTableNotExists(command, schema, table string) string
}
// IntegerAutoIncrInserter is implemented by dialects that can perform
// inserts with automatically incremented integer primary keys. If
// the dialect can handle automatic assignment of more than just
// integers, see TargetedAutoIncrInserter.
type IntegerAutoIncrInserter interface {
InsertAutoIncr(exec SqlExecutor, insertSql string, params ...interface{}) (int64, error)
}
// TargetedAutoIncrInserter is implemented by dialects that can
// perform automatic assignment of any primary key type (i.e. strings
// for uuids, integers for serials, etc).
type TargetedAutoIncrInserter interface {
// InsertAutoIncrToTarget runs an insert operation and assigns the
// automatically generated primary key directly to the passed in
// target. The target should be a pointer to the primary key
// field of the value being inserted.
InsertAutoIncrToTarget(exec SqlExecutor, insertSql string, target interface{}, params ...interface{}) error
}
// TargetQueryInserter is implemented by dialects that can perform
// assignment of integer primary key type by executing a query
// like "select sequence.currval from dual".
type TargetQueryInserter interface {
// TargetQueryInserter runs an insert operation and assigns the
// automatically generated primary key retrived by the query
// extracted from the GeneratedIdQuery field of the id column.
InsertQueryToTarget(exec SqlExecutor, insertSql, idSql string, target interface{}, params ...interface{}) error
}
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()
}
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