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gitea/vendor/xorm.io/builder/builder.go

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Go

// Copyright 2016 The Xorm Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package builder
import (
sql2 "database/sql"
"fmt"
"sort"
)
type optype byte
const (
condType optype = iota // only conditions
selectType // select
insertType // insert
updateType // update
deleteType // delete
unionType // union
)
const (
POSTGRES = "postgres"
SQLITE = "sqlite3"
MYSQL = "mysql"
MSSQL = "mssql"
ORACLE = "oracle"
)
type join struct {
joinType string
joinTable string
joinCond Cond
}
type union struct {
unionType string
builder *Builder
}
type limit struct {
limitN int
offset int
}
// Builder describes a SQL statement
type Builder struct {
optype
dialect string
isNested bool
into string
from string
subQuery *Builder
cond Cond
selects []string
joins []join
unions []union
limitation *limit
insertCols []string
insertVals []interface{}
updates []Eq
orderBy string
groupBy string
having string
}
// Dialect sets the db dialect of Builder.
func Dialect(dialect string) *Builder {
builder := &Builder{cond: NewCond(), dialect: dialect}
return builder
}
// MySQL is shortcut of Dialect(MySQL)
func MySQL() *Builder {
return Dialect(MYSQL)
}
// MsSQL is shortcut of Dialect(MsSQL)
func MsSQL() *Builder {
return Dialect(MSSQL)
}
// Oracle is shortcut of Dialect(Oracle)
func Oracle() *Builder {
return Dialect(ORACLE)
}
// Postgres is shortcut of Dialect(Postgres)
func Postgres() *Builder {
return Dialect(POSTGRES)
}
// SQLite is shortcut of Dialect(SQLITE)
func SQLite() *Builder {
return Dialect(SQLITE)
}
// Where sets where SQL
func (b *Builder) Where(cond Cond) *Builder {
if b.cond.IsValid() {
b.cond = b.cond.And(cond)
} else {
b.cond = cond
}
return b
}
// From sets from subject(can be a table name in string or a builder pointer) and its alias
func (b *Builder) From(subject interface{}, alias ...string) *Builder {
switch subject.(type) {
case *Builder:
b.subQuery = subject.(*Builder)
if len(alias) > 0 {
b.from = alias[0]
} else {
b.isNested = true
}
case string:
b.from = subject.(string)
if len(alias) > 0 {
b.from = b.from + " " + alias[0]
}
}
return b
}
// TableName returns the table name
func (b *Builder) TableName() string {
if b.optype == insertType {
return b.into
}
return b.from
}
// Into sets insert table name
func (b *Builder) Into(tableName string) *Builder {
b.into = tableName
return b
}
// Join sets join table and conditions
func (b *Builder) Join(joinType, joinTable string, joinCond interface{}) *Builder {
switch joinCond.(type) {
case Cond:
b.joins = append(b.joins, join{joinType, joinTable, joinCond.(Cond)})
case string:
b.joins = append(b.joins, join{joinType, joinTable, Expr(joinCond.(string))})
}
return b
}
// Union sets union conditions
func (b *Builder) Union(unionTp string, unionCond *Builder) *Builder {
var builder *Builder
if b.optype != unionType {
builder = &Builder{cond: NewCond()}
builder.optype = unionType
builder.dialect = b.dialect
builder.selects = b.selects
currentUnions := b.unions
// erase sub unions (actually append to new Builder.unions)
b.unions = nil
for e := range currentUnions {
currentUnions[e].builder.dialect = b.dialect
}
builder.unions = append(append(builder.unions, union{"", b}), currentUnions...)
} else {
builder = b
}
if unionCond != nil {
if unionCond.dialect == "" && builder.dialect != "" {
unionCond.dialect = builder.dialect
}
builder.unions = append(builder.unions, union{unionTp, unionCond})
}
return builder
}
// Limit sets limitN condition
func (b *Builder) Limit(limitN int, offset ...int) *Builder {
b.limitation = &limit{limitN: limitN}
if len(offset) > 0 {
b.limitation.offset = offset[0]
}
return b
}
// InnerJoin sets inner join
func (b *Builder) InnerJoin(joinTable string, joinCond interface{}) *Builder {
return b.Join("INNER", joinTable, joinCond)
}
// LeftJoin sets left join SQL
func (b *Builder) LeftJoin(joinTable string, joinCond interface{}) *Builder {
return b.Join("LEFT", joinTable, joinCond)
}
// RightJoin sets right join SQL
func (b *Builder) RightJoin(joinTable string, joinCond interface{}) *Builder {
return b.Join("RIGHT", joinTable, joinCond)
}
// CrossJoin sets cross join SQL
func (b *Builder) CrossJoin(joinTable string, joinCond interface{}) *Builder {
return b.Join("CROSS", joinTable, joinCond)
}
// FullJoin sets full join SQL
func (b *Builder) FullJoin(joinTable string, joinCond interface{}) *Builder {
return b.Join("FULL", joinTable, joinCond)
}
// Select sets select SQL
func (b *Builder) Select(cols ...string) *Builder {
b.selects = cols
if b.optype == condType {
b.optype = selectType
}
return b
}
// And sets AND condition
func (b *Builder) And(cond Cond) *Builder {
b.cond = And(b.cond, cond)
return b
}
// Or sets OR condition
func (b *Builder) Or(cond Cond) *Builder {
b.cond = Or(b.cond, cond)
return b
}
type insertColsSorter struct {
cols []string
vals []interface{}
}
func (s insertColsSorter) Len() int {
return len(s.cols)
}
func (s insertColsSorter) Swap(i, j int) {
s.cols[i], s.cols[j] = s.cols[j], s.cols[i]
s.vals[i], s.vals[j] = s.vals[j], s.vals[i]
}
func (s insertColsSorter) Less(i, j int) bool {
return s.cols[i] < s.cols[j]
}
// Insert sets insert SQL
func (b *Builder) Insert(eq ...interface{}) *Builder {
if len(eq) > 0 {
var paramType = -1
for _, e := range eq {
switch t := e.(type) {
case Eq:
if paramType == -1 {
paramType = 0
}
if paramType != 0 {
break
}
for k, v := range t {
b.insertCols = append(b.insertCols, k)
b.insertVals = append(b.insertVals, v)
}
case string:
if paramType == -1 {
paramType = 1
}
if paramType != 1 {
break
}
b.insertCols = append(b.insertCols, t)
}
}
}
if len(b.insertCols) == len(b.insertVals) {
sort.Sort(insertColsSorter{
cols: b.insertCols,
vals: b.insertVals,
})
}
b.optype = insertType
return b
}
// Update sets update SQL
func (b *Builder) Update(updates ...Eq) *Builder {
b.updates = make([]Eq, 0, len(updates))
for _, update := range updates {
if update.IsValid() {
b.updates = append(b.updates, update)
}
}
b.optype = updateType
return b
}
// Delete sets delete SQL
func (b *Builder) Delete(conds ...Cond) *Builder {
b.cond = b.cond.And(conds...)
b.optype = deleteType
return b
}
// WriteTo implements Writer interface
func (b *Builder) WriteTo(w Writer) error {
switch b.optype {
/*case condType:
return b.cond.WriteTo(w)*/
case selectType:
return b.selectWriteTo(w)
case insertType:
return b.insertWriteTo(w)
case updateType:
return b.updateWriteTo(w)
case deleteType:
return b.deleteWriteTo(w)
case unionType:
return b.unionWriteTo(w)
}
return ErrNotSupportType
}
// ToSQL convert a builder to SQL and args
func (b *Builder) ToSQL() (string, []interface{}, error) {
w := NewWriter()
if err := b.WriteTo(w); err != nil {
return "", nil, err
}
// in case of sql.NamedArg in args
for e := range w.args {
if namedArg, ok := w.args[e].(sql2.NamedArg); ok {
w.args[e] = namedArg.Value
}
}
var sql = w.writer.String()
var err error
switch b.dialect {
case ORACLE, MSSQL:
// This is for compatibility with different sql drivers
for e := range w.args {
w.args[e] = sql2.Named(fmt.Sprintf("p%d", e+1), w.args[e])
}
var prefix string
if b.dialect == ORACLE {
prefix = ":p"
} else {
prefix = "@p"
}
if sql, err = ConvertPlaceholder(sql, prefix); err != nil {
return "", nil, err
}
case POSTGRES:
if sql, err = ConvertPlaceholder(sql, "$"); err != nil {
return "", nil, err
}
}
return sql, w.args, nil
}
// ToBoundSQL
func (b *Builder) ToBoundSQL() (string, error) {
w := NewWriter()
if err := b.WriteTo(w); err != nil {
return "", err
}
return ConvertToBoundSQL(w.writer.String(), w.args)
}