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316 lines
9.0 KiB
316 lines
9.0 KiB
3 years ago
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package gorm
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import (
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"fmt"
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"regexp"
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"strings"
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"gorm.io/gorm/clause"
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"gorm.io/gorm/utils"
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)
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// Model specify the model you would like to run db operations
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// // update all users's name to `hello`
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// db.Model(&User{}).Update("name", "hello")
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// // if user's primary key is non-blank, will use it as condition, then will only update the user's name to `hello`
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// db.Model(&user).Update("name", "hello")
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func (db *DB) Model(value interface{}) (tx *DB) {
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tx = db.getInstance()
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tx.Statement.Model = value
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return
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}
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// Clauses Add clauses
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func (db *DB) Clauses(conds ...clause.Expression) (tx *DB) {
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tx = db.getInstance()
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var whereConds []interface{}
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for _, cond := range conds {
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if c, ok := cond.(clause.Interface); ok {
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tx.Statement.AddClause(c)
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} else if optimizer, ok := cond.(StatementModifier); ok {
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optimizer.ModifyStatement(tx.Statement)
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} else {
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whereConds = append(whereConds, cond)
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}
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}
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if len(whereConds) > 0 {
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tx.Statement.AddClause(clause.Where{Exprs: tx.Statement.BuildCondition(whereConds[0], whereConds[1:]...)})
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}
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return
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}
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var tableRegexp = regexp.MustCompile(`(?i).+? AS (\w+)\s*(?:$|,)`)
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// Table specify the table you would like to run db operations
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func (db *DB) Table(name string, args ...interface{}) (tx *DB) {
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tx = db.getInstance()
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if strings.Contains(name, " ") || strings.Contains(name, "`") || len(args) > 0 {
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tx.Statement.TableExpr = &clause.Expr{SQL: name, Vars: args}
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if results := tableRegexp.FindStringSubmatch(name); len(results) == 2 {
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tx.Statement.Table = results[1]
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}
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} else if tables := strings.Split(name, "."); len(tables) == 2 {
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tx.Statement.TableExpr = &clause.Expr{SQL: tx.Statement.Quote(name)}
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tx.Statement.Table = tables[1]
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} else if name != "" {
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tx.Statement.TableExpr = &clause.Expr{SQL: tx.Statement.Quote(name)}
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tx.Statement.Table = name
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} else {
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tx.Statement.TableExpr = nil
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tx.Statement.Table = ""
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}
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return
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}
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// Distinct specify distinct fields that you want querying
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func (db *DB) Distinct(args ...interface{}) (tx *DB) {
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tx = db.getInstance()
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tx.Statement.Distinct = true
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if len(args) > 0 {
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tx = tx.Select(args[0], args[1:]...)
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}
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return
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}
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// Select specify fields that you want when querying, creating, updating
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func (db *DB) Select(query interface{}, args ...interface{}) (tx *DB) {
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tx = db.getInstance()
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switch v := query.(type) {
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case []string:
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tx.Statement.Selects = v
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for _, arg := range args {
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switch arg := arg.(type) {
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case string:
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tx.Statement.Selects = append(tx.Statement.Selects, arg)
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case []string:
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tx.Statement.Selects = append(tx.Statement.Selects, arg...)
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default:
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tx.AddError(fmt.Errorf("unsupported select args %v %v", query, args))
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return
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}
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}
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if clause, ok := tx.Statement.Clauses["SELECT"]; ok {
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clause.Expression = nil
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tx.Statement.Clauses["SELECT"] = clause
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}
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case string:
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if strings.Count(v, "?") >= len(args) && len(args) > 0 {
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tx.Statement.AddClause(clause.Select{
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Distinct: db.Statement.Distinct,
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Expression: clause.Expr{SQL: v, Vars: args},
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})
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} else if strings.Count(v, "@") > 0 && len(args) > 0 {
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tx.Statement.AddClause(clause.Select{
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Distinct: db.Statement.Distinct,
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Expression: clause.NamedExpr{SQL: v, Vars: args},
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})
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} else {
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tx.Statement.Selects = []string{v}
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for _, arg := range args {
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switch arg := arg.(type) {
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case string:
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tx.Statement.Selects = append(tx.Statement.Selects, arg)
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case []string:
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tx.Statement.Selects = append(tx.Statement.Selects, arg...)
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default:
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tx.Statement.AddClause(clause.Select{
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Distinct: db.Statement.Distinct,
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Expression: clause.Expr{SQL: v, Vars: args},
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})
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return
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}
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}
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if clause, ok := tx.Statement.Clauses["SELECT"]; ok {
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clause.Expression = nil
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tx.Statement.Clauses["SELECT"] = clause
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}
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}
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default:
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tx.AddError(fmt.Errorf("unsupported select args %v %v", query, args))
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}
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return
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}
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// Omit specify fields that you want to ignore when creating, updating and querying
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func (db *DB) Omit(columns ...string) (tx *DB) {
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tx = db.getInstance()
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if len(columns) == 1 && strings.ContainsRune(columns[0], ',') {
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tx.Statement.Omits = strings.FieldsFunc(columns[0], utils.IsValidDBNameChar)
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} else {
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tx.Statement.Omits = columns
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}
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return
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}
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// Where add conditions
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func (db *DB) Where(query interface{}, args ...interface{}) (tx *DB) {
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tx = db.getInstance()
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if conds := tx.Statement.BuildCondition(query, args...); len(conds) > 0 {
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tx.Statement.AddClause(clause.Where{Exprs: conds})
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}
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return
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}
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// Not add NOT conditions
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func (db *DB) Not(query interface{}, args ...interface{}) (tx *DB) {
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tx = db.getInstance()
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if conds := tx.Statement.BuildCondition(query, args...); len(conds) > 0 {
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tx.Statement.AddClause(clause.Where{Exprs: []clause.Expression{clause.Not(conds...)}})
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}
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return
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}
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// Or add OR conditions
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func (db *DB) Or(query interface{}, args ...interface{}) (tx *DB) {
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tx = db.getInstance()
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if conds := tx.Statement.BuildCondition(query, args...); len(conds) > 0 {
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tx.Statement.AddClause(clause.Where{Exprs: []clause.Expression{clause.Or(clause.And(conds...))}})
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}
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return
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}
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// Joins specify Joins conditions
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// db.Joins("Account").Find(&user)
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// db.Joins("JOIN emails ON emails.user_id = users.id AND emails.email = ?", "jinzhu@example.org").Find(&user)
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// db.Joins("Account", DB.Select("id").Where("user_id = users.id AND name = ?", "someName").Model(&Account{}))
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func (db *DB) Joins(query string, args ...interface{}) (tx *DB) {
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tx = db.getInstance()
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if len(args) == 1 {
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if db, ok := args[0].(*DB); ok {
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if where, ok := db.Statement.Clauses["WHERE"].Expression.(clause.Where); ok {
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tx.Statement.Joins = append(tx.Statement.Joins, join{Name: query, Conds: args, On: &where})
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return
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}
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}
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}
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tx.Statement.Joins = append(tx.Statement.Joins, join{Name: query, Conds: args})
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return
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}
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// Group specify the group method on the find
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func (db *DB) Group(name string) (tx *DB) {
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tx = db.getInstance()
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fields := strings.FieldsFunc(name, utils.IsValidDBNameChar)
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tx.Statement.AddClause(clause.GroupBy{
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Columns: []clause.Column{{Name: name, Raw: len(fields) != 1}},
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})
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return
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}
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// Having specify HAVING conditions for GROUP BY
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func (db *DB) Having(query interface{}, args ...interface{}) (tx *DB) {
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tx = db.getInstance()
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tx.Statement.AddClause(clause.GroupBy{
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Having: tx.Statement.BuildCondition(query, args...),
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})
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return
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}
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// Order specify order when retrieve records from database
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// db.Order("name DESC")
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// db.Order(clause.OrderByColumn{Column: clause.Column{Name: "name"}, Desc: true})
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func (db *DB) Order(value interface{}) (tx *DB) {
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tx = db.getInstance()
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switch v := value.(type) {
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case clause.OrderByColumn:
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tx.Statement.AddClause(clause.OrderBy{
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Columns: []clause.OrderByColumn{v},
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})
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case string:
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if v != "" {
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tx.Statement.AddClause(clause.OrderBy{
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Columns: []clause.OrderByColumn{{
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Column: clause.Column{Name: v, Raw: true},
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}},
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})
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}
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}
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return
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}
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// Limit specify the number of records to be retrieved
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func (db *DB) Limit(limit int) (tx *DB) {
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tx = db.getInstance()
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tx.Statement.AddClause(clause.Limit{Limit: limit})
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return
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}
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// Offset specify the number of records to skip before starting to return the records
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func (db *DB) Offset(offset int) (tx *DB) {
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tx = db.getInstance()
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tx.Statement.AddClause(clause.Limit{Offset: offset})
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return
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}
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// Scopes pass current database connection to arguments `func(DB) DB`, which could be used to add conditions dynamically
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// func AmountGreaterThan1000(db *gorm.DB) *gorm.DB {
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// return db.Where("amount > ?", 1000)
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// }
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//
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// func OrderStatus(status []string) func (db *gorm.DB) *gorm.DB {
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// return func (db *gorm.DB) *gorm.DB {
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// return db.Scopes(AmountGreaterThan1000).Where("status in (?)", status)
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// }
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// }
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//
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// db.Scopes(AmountGreaterThan1000, OrderStatus([]string{"paid", "shipped"})).Find(&orders)
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func (db *DB) Scopes(funcs ...func(*DB) *DB) (tx *DB) {
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tx = db.getInstance()
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tx.Statement.scopes = append(tx.Statement.scopes, funcs...)
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return tx
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}
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// Preload preload associations with given conditions
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// db.Preload("Orders", "state NOT IN (?)", "cancelled").Find(&users)
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func (db *DB) Preload(query string, args ...interface{}) (tx *DB) {
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tx = db.getInstance()
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if tx.Statement.Preloads == nil {
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tx.Statement.Preloads = map[string][]interface{}{}
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}
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tx.Statement.Preloads[query] = args
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return
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}
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func (db *DB) Attrs(attrs ...interface{}) (tx *DB) {
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tx = db.getInstance()
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tx.Statement.attrs = attrs
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return
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}
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func (db *DB) Assign(attrs ...interface{}) (tx *DB) {
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tx = db.getInstance()
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tx.Statement.assigns = attrs
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return
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}
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func (db *DB) Unscoped() (tx *DB) {
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tx = db.getInstance()
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tx.Statement.Unscoped = true
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return
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}
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func (db *DB) Raw(sql string, values ...interface{}) (tx *DB) {
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tx = db.getInstance()
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tx.Statement.SQL = strings.Builder{}
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if strings.Contains(sql, "@") {
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clause.NamedExpr{SQL: sql, Vars: values}.Build(tx.Statement)
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} else {
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clause.Expr{SQL: sql, Vars: values}.Build(tx.Statement)
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}
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return
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}
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