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create_table.go
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create_table.go
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package orm
import (
"errors"
"strconv"
)
type CreateTableOptions struct {
Temp bool
IfNotExists bool
Varchar int // replaces PostgreSQL data type `text` with `varchar(n)`
FKConstraints bool // whether to create foreign key constraints
}
func CreateTable(db DB, model interface{}, opt *CreateTableOptions) (Result, error) {
return NewQuery(db, model).CreateTable(opt)
}
type createTableQuery struct {
q *Query
opt *CreateTableOptions
}
func (q createTableQuery) Copy() QueryAppender {
return q
}
func (q createTableQuery) Query() *Query {
return q.q
}
func (q createTableQuery) AppendQuery(b []byte) ([]byte, error) {
if q.q.stickyErr != nil {
return nil, q.q.stickyErr
}
if q.q.model == nil {
return nil, errors.New("pg: Model is nil")
}
table := q.q.model.Table()
b = append(b, "CREATE "...)
if q.opt != nil && q.opt.Temp {
b = append(b, "TEMP "...)
}
b = append(b, "TABLE "...)
if q.opt != nil && q.opt.IfNotExists {
b = append(b, "IF NOT EXISTS "...)
}
b = q.q.appendTableName(b)
b = append(b, " ("...)
for i, field := range table.Fields {
b = append(b, field.Column...)
b = append(b, " "...)
if q.opt != nil && q.opt.Varchar > 0 &&
field.SQLType == "text" && !field.HasFlag(customTypeFlag) {
b = append(b, "varchar("...)
b = strconv.AppendInt(b, int64(q.opt.Varchar), 10)
b = append(b, ")"...)
} else {
b = append(b, field.SQLType...)
}
if field.HasFlag(NotNullFlag) {
b = append(b, " NOT NULL"...)
}
if field.HasFlag(UniqueFlag) {
b = append(b, " UNIQUE"...)
}
if field.Default != "" {
b = append(b, " DEFAULT "...)
b = append(b, field.Default...)
}
if i != len(table.Fields)-1 {
b = append(b, ", "...)
}
}
b = appendPKConstraint(b, table.PKs)
if q.opt != nil && q.opt.FKConstraints {
for _, rel := range table.Relations {
b = q.appendFKConstraint(b, table, rel)
}
}
b = append(b, ")"...)
return b, nil
}
func appendPKConstraint(b []byte, pks []*Field) []byte {
if len(pks) == 0 {
return b
}
b = append(b, ", PRIMARY KEY ("...)
b = appendColumns(b, pks)
b = append(b, ")"...)
return b
}
func (q createTableQuery) appendFKConstraint(b []byte, table *Table, rel *Relation) []byte {
if rel.Type != HasOneRelation {
return b
}
b = append(b, ", FOREIGN KEY ("...)
b = appendColumns(b, rel.FKs)
b = append(b, ")"...)
b = append(b, " REFERENCES "...)
b = q.q.FormatQuery(b, string(rel.JoinTable.Name))
b = append(b, " ("...)
b = appendColumns(b, rel.JoinTable.PKs)
b = append(b, ")"...)
b = append(b, " ON DELETE CASCADE"...)
return b
}