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sqlbuilder.go
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sqlbuilder.go
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// Copyright 2011-2018 Paul Ruane.
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package database
import (
"bytes"
"strconv"
)
type SqlBuilder struct {
sql bytes.Buffer
params []interface{}
paramIndex int
needsParamComma bool
}
func NewBuilder() *SqlBuilder {
builder := SqlBuilder{bytes.Buffer{}, make([]interface{}, 0), 1, false}
return &builder
}
func (builder *SqlBuilder) Sql() string {
return builder.sql.String()
}
func (builder *SqlBuilder) Params() []interface{} {
return builder.params
}
func (builder *SqlBuilder) AppendSql(sql string) {
if sql == "" {
return
}
switch sql[0] {
case ' ', '\n':
// do nowt
default:
builder.sql.WriteRune('\n')
}
builder.sql.WriteString(sql)
builder.needsParamComma = false
}
func (builder *SqlBuilder) AppendParam(value interface{}) {
if builder.needsParamComma {
builder.sql.WriteRune(',')
}
builder.sql.WriteRune('?')
builder.sql.WriteString(strconv.Itoa(builder.paramIndex))
builder.paramIndex++
builder.params = append(builder.params, value)
builder.needsParamComma = true
}