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condition.go
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condition.go
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package sqlbuilder
// Condition represents a condition for WHERE clause and other.
type Condition interface {
serializable
columns() []Column
}
type connectCondition struct {
connector string
conds []Condition
}
func (c *connectCondition) serialize(bldr *builder) {
first := true
for _, cond := range c.conds {
if first {
first = false
} else {
bldr.Append(" " + c.connector + " ")
}
if _, ok := cond.(*connectCondition); ok {
// if condition is AND or OR
bldr.Append("( ")
bldr.AppendItem(cond)
bldr.Append(" )")
} else {
bldr.AppendItem(cond)
}
}
return
}
func (c *connectCondition) columns() []Column {
list := make([]Column, 0)
for _, cond := range c.conds {
list = append(list, cond.columns()...)
}
return list
}
// And creates a combined condition with "AND" operator.
func And(conds ...Condition) Condition {
return &connectCondition{
connector: "AND",
conds: conds,
}
}
// And creates a combined condition with "OR" operator.
func Or(conds ...Condition) Condition {
return &connectCondition{
connector: "OR",
conds: conds,
}
}
type binaryOperationCondition struct {
left serializable
right serializable
operator string
err error
}
func newBinaryOperationCondition(left, right interface{}, operator string) *binaryOperationCondition {
cond := &binaryOperationCondition{
operator: operator,
}
column_exist := false
switch t := left.(type) {
case Column:
column_exist = true
cond.left = t
case nil:
cond.err = newError("left-hand side of binary operator is null.")
default:
cond.left = toLiteral(t)
}
switch t := right.(type) {
case Column:
column_exist = true
cond.right = t
default:
cond.right = toLiteral(t)
}
if !column_exist {
cond.err = newError("binary operation is need column.")
}
return cond
}
func newBetweenCondition(left Column, low, high interface{}) Condition {
low_literal := toLiteral(low)
high_literal := toLiteral(high)
return &betweenCondition{
left: left,
lower: low_literal,
higher: high_literal,
}
}
func (c *binaryOperationCondition) serialize(bldr *builder) {
bldr.AppendItem(c.left)
switch t := c.right.(type) {
case literal:
if t.IsNil() {
switch c.operator {
case "=":
bldr.Append(" IS ")
case "<>":
bldr.Append(" IS NOT ")
default:
bldr.SetError(newError("NULL can not be used with %s operator.", c.operator))
}
bldr.Append("NULL")
} else {
bldr.Append(c.operator)
bldr.AppendItem(c.right)
}
default:
bldr.Append(c.operator)
bldr.AppendItem(c.right)
}
return
}
func (c *binaryOperationCondition) columns() []Column {
list := make([]Column, 0)
if col, ok := c.left.(Column); ok {
list = append(list, col)
}
if col, ok := c.right.(Column); ok {
list = append(list, col)
}
return list
}
type betweenCondition struct {
left serializable
lower serializable
higher serializable
}
func (c *betweenCondition) serialize(bldr *builder) {
bldr.AppendItem(c.left)
bldr.Append(" BETWEEN ")
bldr.AppendItem(c.lower)
bldr.Append(" AND ")
bldr.AppendItem(c.higher)
return
}
func (c *betweenCondition) columns() []Column {
list := make([]Column, 0)
if col, ok := c.left.(Column); ok {
list = append(list, col)
}
if col, ok := c.lower.(Column); ok {
list = append(list, col)
}
if col, ok := c.higher.(Column); ok {
list = append(list, col)
}
return list
}
type inCondition struct {
left serializable
in []serializable
}
func newInCondition(left Column, list ...interface{}) Condition {
m := &inCondition{
left: left,
in: make([]serializable, 0, len(list)),
}
for _, item := range list {
if c, ok := item.(Column); ok {
m.in = append(m.in, c)
} else {
m.in = append(m.in, toLiteral(item))
}
}
return m
}
func (c *inCondition) serialize(bldr *builder) {
bldr.AppendItem(c.left)
bldr.Append(" IN ( ")
bldr.AppendItems(c.in, ", ")
bldr.Append(" )")
}
func (c *inCondition) columns() []Column {
list := make([]Column, 0)
if col, ok := c.left.(Column); ok {
list = append(list, col)
}
for _, in := range c.in {
if col, ok := in.(Column); ok {
list = append(list, col)
}
}
return list
}