mirror of https://github.com/go-gorm/gorm.git
90 lines
2.1 KiB
Go
90 lines
2.1 KiB
Go
|
package postgres
|
||
|
|
|
||
|
|
import (
|
||
|
|
"fmt"
|
||
|
|
|
||
|
|
"github.com/jinzhu/gorm"
|
||
|
|
"github.com/jinzhu/gorm/clause"
|
||
|
|
"github.com/jinzhu/gorm/migrator"
|
||
|
|
"github.com/jinzhu/gorm/schema"
|
||
|
|
)
|
||
|
|
|
||
|
|
type Migrator struct {
|
||
|
|
migrator.Migrator
|
||
|
|
}
|
||
|
|
|
||
|
|
func (m Migrator) CurrentDatabase() (name string) {
|
||
|
|
m.DB.Raw("SELECT CURRENT_DATABASE()").Row().Scan(&name)
|
||
|
|
return
|
||
|
|
}
|
||
|
|
|
||
|
|
func (m Migrator) BuildIndexOptions(opts []schema.IndexOption, stmt *gorm.Statement) (results []interface{}) {
|
||
|
|
for _, opt := range opts {
|
||
|
|
str := stmt.Quote(opt.DBName)
|
||
|
|
if opt.Expression != "" {
|
||
|
|
str = opt.Expression
|
||
|
|
}
|
||
|
|
|
||
|
|
if opt.Collate != "" {
|
||
|
|
str += " COLLATE " + opt.Collate
|
||
|
|
}
|
||
|
|
|
||
|
|
if opt.Sort != "" {
|
||
|
|
str += " " + opt.Sort
|
||
|
|
}
|
||
|
|
results = append(results, clause.Expr{SQL: str})
|
||
|
|
}
|
||
|
|
return
|
||
|
|
}
|
||
|
|
|
||
|
|
func (m Migrator) HasIndex(value interface{}, indexName string) bool {
|
||
|
|
var count int64
|
||
|
|
m.RunWithValue(value, func(stmt *gorm.Statement) error {
|
||
|
|
return m.DB.Raw(
|
||
|
|
"SELECT count(*) FROM pg_indexes WHERE tablename = ? AND indexname = ? AND schemaname = CURRENT_SCHEMA()", stmt.Table, indexName,
|
||
|
|
).Row().Scan(&count)
|
||
|
|
})
|
||
|
|
|
||
|
|
return count > 0
|
||
|
|
}
|
||
|
|
|
||
|
|
func (m Migrator) CreateIndex(value interface{}, name string) error {
|
||
|
|
return m.RunWithValue(value, func(stmt *gorm.Statement) error {
|
||
|
|
err := fmt.Errorf("failed to create index with name %v", name)
|
||
|
|
indexes := stmt.Schema.ParseIndexes()
|
||
|
|
|
||
|
|
if idx, ok := indexes[name]; ok {
|
||
|
|
opts := m.BuildIndexOptions(idx.Fields, stmt)
|
||
|
|
values := []interface{}{clause.Column{Name: idx.Name}, clause.Table{Name: stmt.Table}, opts}
|
||
|
|
|
||
|
|
createIndexSQL := "CREATE "
|
||
|
|
if idx.Class != "" {
|
||
|
|
createIndexSQL += idx.Class + " "
|
||
|
|
}
|
||
|
|
createIndexSQL += "INDEX ?"
|
||
|
|
|
||
|
|
if idx.Type != "" {
|
||
|
|
createIndexSQL += " USING " + idx.Type
|
||
|
|
}
|
||
|
|
createIndexSQL += " ON ??"
|
||
|
|
|
||
|
|
if idx.Where != "" {
|
||
|
|
createIndexSQL += " WHERE " + idx.Where
|
||
|
|
}
|
||
|
|
|
||
|
|
return m.DB.Exec(createIndexSQL, values...).Error
|
||
|
|
} else if field := stmt.Schema.LookUpField(name); field != nil {
|
||
|
|
for _, idx := range indexes {
|
||
|
|
for _, idxOpt := range idx.Fields {
|
||
|
|
if idxOpt.Field == field {
|
||
|
|
if err = m.CreateIndex(value, idx.Name); err != nil {
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return err
|
||
|
|
})
|
||
|
|
}
|