forked from mirror/gorm
86 lines
1.6 KiB
Go
86 lines
1.6 KiB
Go
package clause
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// Interface clause interface
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type Interface interface {
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Name() string
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Build(Builder)
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MergeClause(*Clause)
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}
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// ClauseBuilder clause builder, allows to custmize how to build clause
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type ClauseBuilder interface {
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Build(Clause, Builder)
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}
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type Writer interface {
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WriteByte(byte) error
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WriteString(string) (int, error)
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}
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// Builder builder interface
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type Builder interface {
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Writer
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WriteQuoted(field interface{}) error
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AddVar(Writer, ...interface{})
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}
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// Clause
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type Clause struct {
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Name string // WHERE
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Priority float64
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BeforeExpressions []Expression
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AfterNameExpressions []Expression
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AfterExpressions []Expression
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Expression Expression
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Builder ClauseBuilder
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}
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// Build build clause
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func (c Clause) Build(builder Builder) {
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if c.Builder != nil {
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c.Builder.Build(c, builder)
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} else {
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builders := c.BeforeExpressions
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if c.Name != "" {
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builders = append(builders, Expr{SQL: c.Name})
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}
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builders = append(builders, c.AfterNameExpressions...)
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if c.Expression != nil {
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builders = append(builders, c.Expression)
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}
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for idx, expr := range append(builders, c.AfterExpressions...) {
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if idx != 0 {
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builder.WriteByte(' ')
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}
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expr.Build(builder)
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}
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}
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}
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const (
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PrimaryKey string = "@@@priamry_key@@@"
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CurrentTable string = "@@@table@@@"
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)
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var (
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currentTable = Table{Name: CurrentTable}
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PrimaryColumn = Column{Table: CurrentTable, Name: PrimaryKey}
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)
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// Column quote with name
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type Column struct {
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Table string
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Name string
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Alias string
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Raw bool
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}
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// Table quote with name
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type Table struct {
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Name string
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Alias string
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Raw bool
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}
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