forked from mirror/gorm
185 lines
3.6 KiB
Go
185 lines
3.6 KiB
Go
package clause
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// Expression expression interface
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type Expression interface {
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Build(builder Builder)
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}
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// NegationExpressionBuilder negation expression builder
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type NegationExpressionBuilder interface {
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NegationBuild(builder Builder)
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}
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// Expr raw expression
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type Expr struct {
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SQL string
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Vars []interface{}
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}
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// Build build raw expression
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func (expr Expr) Build(builder Builder) {
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var idx int
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for _, v := range []byte(expr.SQL) {
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if v == '?' {
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builder.AddVar(builder, expr.Vars[idx])
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idx++
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} else {
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builder.WriteByte(v)
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}
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}
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}
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// IN Whether a value is within a set of values
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type IN struct {
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Column interface{}
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Values []interface{}
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}
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func (in IN) Build(builder Builder) {
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builder.WriteQuoted(in.Column)
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switch len(in.Values) {
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case 0:
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builder.WriteString(" IN (NULL)")
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case 1:
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builder.WriteString(" = ")
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builder.AddVar(builder, in.Values...)
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default:
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builder.WriteString(" IN (")
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builder.AddVar(builder, in.Values...)
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builder.WriteByte(')')
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}
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}
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func (in IN) NegationBuild(builder Builder) {
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switch len(in.Values) {
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case 0:
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case 1:
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builder.WriteQuoted(in.Column)
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builder.WriteString(" <> ")
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builder.AddVar(builder, in.Values...)
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default:
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builder.WriteQuoted(in.Column)
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builder.WriteString(" NOT IN (")
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builder.AddVar(builder, in.Values...)
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builder.WriteByte(')')
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}
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}
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// Eq equal to for where
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type Eq struct {
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Column interface{}
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Value interface{}
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}
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func (eq Eq) Build(builder Builder) {
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builder.WriteQuoted(eq.Column)
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if eq.Value == nil {
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builder.WriteString(" IS NULL")
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} else {
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builder.WriteString(" = ")
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builder.AddVar(builder, eq.Value)
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}
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}
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func (eq Eq) NegationBuild(builder Builder) {
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Neq{eq.Column, eq.Value}.Build(builder)
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}
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// Neq not equal to for where
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type Neq Eq
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func (neq Neq) Build(builder Builder) {
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builder.WriteQuoted(neq.Column)
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if neq.Value == nil {
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builder.WriteString(" IS NOT NULL")
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} else {
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builder.WriteString(" <> ")
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builder.AddVar(builder, neq.Value)
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}
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}
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func (neq Neq) NegationBuild(builder Builder) {
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Eq{neq.Column, neq.Value}.Build(builder)
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}
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// Gt greater than for where
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type Gt Eq
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func (gt Gt) Build(builder Builder) {
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builder.WriteQuoted(gt.Column)
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builder.WriteString(" > ")
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builder.AddVar(builder, gt.Value)
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}
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func (gt Gt) NegationBuild(builder Builder) {
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Lte{gt.Column, gt.Value}.Build(builder)
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}
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// Gte greater than or equal to for where
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type Gte Eq
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func (gte Gte) Build(builder Builder) {
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builder.WriteQuoted(gte.Column)
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builder.WriteString(" >= ")
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builder.AddVar(builder, gte.Value)
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}
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func (gte Gte) NegationBuild(builder Builder) {
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Lt{gte.Column, gte.Value}.Build(builder)
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}
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// Lt less than for where
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type Lt Eq
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func (lt Lt) Build(builder Builder) {
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builder.WriteQuoted(lt.Column)
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builder.WriteString(" < ")
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builder.AddVar(builder, lt.Value)
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}
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func (lt Lt) NegationBuild(builder Builder) {
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Gte{lt.Column, lt.Value}.Build(builder)
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}
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// Lte less than or equal to for where
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type Lte Eq
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func (lte Lte) Build(builder Builder) {
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builder.WriteQuoted(lte.Column)
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builder.WriteString(" <= ")
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builder.AddVar(builder, lte.Value)
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}
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func (lte Lte) NegationBuild(builder Builder) {
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Gt{lte.Column, lte.Value}.Build(builder)
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}
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// Like whether string matches regular expression
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type Like Eq
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func (like Like) Build(builder Builder) {
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builder.WriteQuoted(like.Column)
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builder.WriteString(" LIKE ")
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builder.AddVar(builder, like.Value)
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}
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func (like Like) NegationBuild(builder Builder) {
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builder.WriteQuoted(like.Column)
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builder.WriteString(" NOT LIKE ")
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builder.AddVar(builder, like.Value)
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}
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// Map
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type Map map[interface{}]interface{}
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func (m Map) Build(builder Builder) {
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// TODO
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}
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func (m Map) NegationBuild(builder Builder) {
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// TODO
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}
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