mirror of https://github.com/go-gorm/gorm.git
132 lines
2.4 KiB
Go
132 lines
2.4 KiB
Go
package clause
|
|
|
|
// Where where clause
|
|
type Where struct {
|
|
Exprs []Expression
|
|
}
|
|
|
|
// Name where clause name
|
|
func (where Where) Name() string {
|
|
return "WHERE"
|
|
}
|
|
|
|
// Build build where clause
|
|
func (where Where) Build(builder Builder) {
|
|
// Switch position if the first query expression is a single Or condition
|
|
for idx, expr := range where.Exprs {
|
|
if v, ok := expr.(OrConditions); !ok || len(v.Exprs) > 1 {
|
|
if idx != 0 {
|
|
where.Exprs[0], where.Exprs[idx] = where.Exprs[idx], where.Exprs[0]
|
|
}
|
|
break
|
|
}
|
|
}
|
|
|
|
for idx, expr := range where.Exprs {
|
|
if idx > 0 {
|
|
if v, ok := expr.(OrConditions); ok && len(v.Exprs) == 1 {
|
|
builder.WriteString(" OR ")
|
|
} else {
|
|
builder.WriteString(" AND ")
|
|
}
|
|
}
|
|
|
|
expr.Build(builder)
|
|
}
|
|
|
|
return
|
|
}
|
|
|
|
// MergeClause merge where clauses
|
|
func (where Where) MergeClause(clause *Clause) {
|
|
if w, ok := clause.Expression.(Where); ok {
|
|
where.Exprs = append(w.Exprs, where.Exprs...)
|
|
}
|
|
|
|
clause.Expression = where
|
|
}
|
|
|
|
func And(exprs ...Expression) Expression {
|
|
if len(exprs) == 0 {
|
|
return nil
|
|
}
|
|
return AndConditions{Exprs: exprs}
|
|
}
|
|
|
|
type AndConditions struct {
|
|
Exprs []Expression
|
|
}
|
|
|
|
func (and AndConditions) Build(builder Builder) {
|
|
if len(and.Exprs) > 1 {
|
|
builder.WriteByte('(')
|
|
}
|
|
for idx, c := range and.Exprs {
|
|
if idx > 0 {
|
|
builder.WriteString(" AND ")
|
|
}
|
|
c.Build(builder)
|
|
}
|
|
if len(and.Exprs) > 1 {
|
|
builder.WriteByte(')')
|
|
}
|
|
}
|
|
|
|
func Or(exprs ...Expression) Expression {
|
|
if len(exprs) == 0 {
|
|
return nil
|
|
}
|
|
return OrConditions{Exprs: exprs}
|
|
}
|
|
|
|
type OrConditions struct {
|
|
Exprs []Expression
|
|
}
|
|
|
|
func (or OrConditions) Build(builder Builder) {
|
|
if len(or.Exprs) > 1 {
|
|
builder.WriteByte('(')
|
|
}
|
|
for idx, c := range or.Exprs {
|
|
if idx > 0 {
|
|
builder.WriteString(" OR ")
|
|
}
|
|
c.Build(builder)
|
|
}
|
|
if len(or.Exprs) > 1 {
|
|
builder.WriteByte(')')
|
|
}
|
|
}
|
|
|
|
func Not(exprs ...Expression) Expression {
|
|
if len(exprs) == 0 {
|
|
return nil
|
|
}
|
|
return NotConditions{Exprs: exprs}
|
|
}
|
|
|
|
type NotConditions struct {
|
|
Exprs []Expression
|
|
}
|
|
|
|
func (not NotConditions) Build(builder Builder) {
|
|
if len(not.Exprs) > 1 {
|
|
builder.WriteByte('(')
|
|
}
|
|
for idx, c := range not.Exprs {
|
|
if idx > 0 {
|
|
builder.WriteString(" AND ")
|
|
}
|
|
|
|
if negationBuilder, ok := c.(NegationExpressionBuilder); ok {
|
|
negationBuilder.NegationBuild(builder)
|
|
} else {
|
|
builder.WriteString(" NOT ")
|
|
c.Build(builder)
|
|
}
|
|
}
|
|
if len(not.Exprs) > 1 {
|
|
builder.WriteByte(')')
|
|
}
|
|
}
|