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tablejoins.go
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tablejoins.go
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// Copyright 2016 NDP Systèmes. 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 models
import "fmt"
// tableJoin represents a join in a SQL query
// tableName should be escaped already in the struct
type tableJoin struct {
tableName string
joined bool
innerJoin bool
field string
otherTable *tableJoin
otherField string
alias string
expr string
}
// sqlString returns the sql string for the tableJoin Clause
func (t tableJoin) sqlString() string {
var joinStr string
if !t.joined {
return fmt.Sprintf("%s %s ", t.tableName, t.alias)
}
joinType := "LEFT "
if t.innerJoin {
joinType = "INNER "
}
joinStr = joinType + "JOIN "
return fmt.Sprintf("%s%s %s ON %s.%s=%s.%s ", joinStr, t.tableName, t.alias, t.otherTable.alias, t.otherField,
t.alias, t.field)
}