Commit 0820e217 authored by astaxie's avatar astaxie

Merge pull request #804 from ZhengYang/develop

QueryBuilder for building SQL queries quickly
parents 647a4751 38eb29fa
// Copyright 2014 beego Author. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package orm
import "errors"
type QueryBuilder interface {
Select(fields ...string) QueryBuilder
From(tables ...string) QueryBuilder
Where(cond string) QueryBuilder
LimitOffset(limit int, offset int) QueryBuilder
InnerJoin(table string) QueryBuilder
LeftJoin(table string) QueryBuilder
On(cond string) QueryBuilder
And(cond string) QueryBuilder
Or(cond string) QueryBuilder
In(vals ...string) QueryBuilder
Subquery(query string, rename string) string
String() string
}
func NewQueryBuilder(driver string) (qb QueryBuilder, err error) {
if driver == "mysql" {
qb = new(MySQLQueryBuilder)
} else if driver == "postgres" {
err = errors.New("postgres query builder is not supported yet!")
} else if driver == "sqlite" {
err = errors.New("sqlite query builder is not supported yet!")
} else {
err = errors.New("unknown driver for query builder!")
}
return
}
// Copyright 2014 beego Author. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package orm
import (
"fmt"
"strings"
)
type MySQLQueryBuilder struct {
QueryString []string
}
func (qw *MySQLQueryBuilder) Select(fields ...string) QueryBuilder {
segment := fmt.Sprintf("SELECT %s", strings.Join(fields, ", "))
qw.QueryString = append(qw.QueryString, segment)
return qw
}
func (qw *MySQLQueryBuilder) From(tables ...string) QueryBuilder {
segment := fmt.Sprintf("FROM %s", strings.Join(tables, ", "))
qw.QueryString = append(qw.QueryString, segment)
return qw
}
func (qw *MySQLQueryBuilder) Where(cond string) QueryBuilder {
qw.QueryString = append(qw.QueryString, "WHERE "+cond)
return qw
}
func (qw *MySQLQueryBuilder) LimitOffset(limit int, offset int) QueryBuilder {
qw.QueryString = append(qw.QueryString, fmt.Sprintf("LIMIT %d OFFSET %d", limit, offset))
return qw
}
func (qw *MySQLQueryBuilder) InnerJoin(table string) QueryBuilder {
qw.QueryString = append(qw.QueryString, "INNER JOIN "+table)
return qw
}
func (qw *MySQLQueryBuilder) LeftJoin(table string) QueryBuilder {
qw.QueryString = append(qw.QueryString, "LEFT JOIN "+table)
return qw
}
func (qw *MySQLQueryBuilder) On(cond string) QueryBuilder {
qw.QueryString = append(qw.QueryString, "ON "+cond)
return qw
}
func (qw *MySQLQueryBuilder) And(cond string) QueryBuilder {
qw.QueryString = append(qw.QueryString, "AND "+cond)
return qw
}
func (qw *MySQLQueryBuilder) Or(cond string) QueryBuilder {
qw.QueryString = append(qw.QueryString, "OR "+cond)
return qw
}
func (qw *MySQLQueryBuilder) In(vals ...string) QueryBuilder {
segment := fmt.Sprintf("IN (%s)", strings.Join(vals, ", "))
qw.QueryString = append(qw.QueryString, segment)
return qw
}
func (qw *MySQLQueryBuilder) Subquery(sub string, alias string) string {
return fmt.Sprintf("(%s) AS %s", sub, alias)
}
func (qw *MySQLQueryBuilder) String() string {
return strings.Join(qw.QueryString, " ")
}
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