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master
clause/clause.go
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Jinzhu
Allow modify statement from dest
02 фев 2023, 12:15
02 фев 2023, 12:15
4d6b70e
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package clause // Interface clause interface type Interface interface { Name() string Build(Builder) MergeClause(*Clause) } // ClauseBuilder clause builder, allows to customize how to build clause type ClauseBuilder func(Clause, Builder) type Writer interface { WriteByte(byte) error WriteString(string) (int, error) } // Builder builder interface type Builder interface { Writer WriteQuoted(field interface{}) AddVar(Writer, ...interface{}) AddError(error) error } // Clause type Clause struct { Name string // WHERE BeforeExpression Expression AfterNameExpression Expression AfterExpression Expression Expression Expression Builder ClauseBuilder } // Build build clause func (c Clause) Build(builder Builder) { if c.Builder != nil { c.Builder(c, builder) } else if c.Expression != nil { if c.BeforeExpression != nil { c.BeforeExpression.Build(builder) builder.WriteByte(' ') } if c.Name != "" { builder.WriteString(c.Name) builder.WriteByte(' ') } if c.AfterNameExpression != nil { c.AfterNameExpression.Build(builder) builder.WriteByte(' ') } c.Expression.Build(builder) if c.AfterExpression != nil { builder.WriteByte(' ') c.AfterExpression.Build(builder) } } } const ( PrimaryKey string = "~~~py~~~" // primary key CurrentTable string = "~~~ct~~~" // current table Associations string = "~~~as~~~" // associations ) var ( currentTable = Table{Name: CurrentTable} PrimaryColumn = Column{Table: CurrentTable, Name: PrimaryKey} ) // Column quote with name type Column struct { Table string Name string Alias string Raw bool } // Table quote with name type Table struct { Name string Alias string Raw bool }