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chain.go
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chain.go
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package clause
import (
"context"
dbi "github.com/hopeio/cherry/utils/dao/db"
"gorm.io/gorm"
"gorm.io/gorm/clause"
)
type ChainDB func(db *gorm.DB) *gorm.DB
func noOp(db *gorm.DB) *gorm.DB {
return db
}
func (c ChainDB) ById(id int) ChainDB {
if id > 0 {
return c.ByIdNoCheck(id)
}
return noOp
}
func (c ChainDB) ByIdNoCheck(id int) ChainDB {
return func(db *gorm.DB) *gorm.DB {
return db.Where("id = ?", id)
}
}
func (c ChainDB) ByName(name string) ChainDB {
if name != "" {
return c.ByNameNoCheck(name)
}
return noOp
}
func (c ChainDB) ByNameNoCheck(name string) ChainDB {
return func(db *gorm.DB) *gorm.DB {
return db.Where("name = ?", name)
}
}
func (c ChainDB) List(dest any) ChainDB {
return func(db *gorm.DB) *gorm.DB {
return db.Find(dest)
}
}
func NewChainDB(ctx context.Context) ChainDB {
return func(db *gorm.DB) *gorm.DB {
return db.WithContext(ctx)
}
}
type Expression dbi.FilterExpr
func (e *Expression) Clause() func(*gorm.DB) *gorm.DB {
return func(db *gorm.DB) *gorm.DB {
return db.Where(e.Field+(*dbi.FilterExpr)(e).Operation.SQL(), e.Value...)
}
}
func NewClause(field string, op dbi.Operation, args ...interface{}) func(*gorm.DB) *gorm.DB {
return func(db *gorm.DB) *gorm.DB {
return db.Where(field+op.SQL(), args...)
}
}
type ChainClause []func(db *gorm.DB) *gorm.DB
// db.Scope(ById(1),ByName("a")).First(v)
func (c ChainClause) ById(id int) ChainClause {
if id > 0 {
return c.ByIdNoCheck(id)
}
return c
}
func (c ChainClause) ByIdNoCheck(id int) ChainClause {
return append(c, NewClause("id", dbi.Equal, id))
}
func (c ChainClause) ByName(name string) ChainClause {
if name != "" {
return c.ByNameNoCheck(name)
}
return c
}
func (c ChainClause) ByNameNoCheck(name string) ChainClause {
return append(c, func(db *gorm.DB) *gorm.DB {
return db.Where(`name = ?`, name)
})
}
func (c ChainClause) Exec(db *gorm.DB) *gorm.DB {
db = db.Scopes(c...)
return db
}
type Clause3 []clause.Interface
func (c Clause3) ByIdNoCheck(id int) Clause3 {
return append(c, clause.Where{Exprs: []clause.Expression{clause.Eq{Column: "id", Value: id}}})
}