mirror of https://github.com/go-gorm/gorm.git
240 lines
7.4 KiB
Go
240 lines
7.4 KiB
Go
package callbacks
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import (
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"fmt"
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"reflect"
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"sort"
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"strings"
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"gorm.io/gorm"
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"gorm.io/gorm/clause"
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"gorm.io/gorm/schema"
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)
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func Query(db *gorm.DB) {
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if db.Error == nil {
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BuildQuerySQL(db)
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if !db.DryRun && db.Error == nil {
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rows, err := db.Statement.ConnPool.QueryContext(db.Statement.Context, db.Statement.SQL.String(), db.Statement.Vars...)
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if err != nil {
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db.AddError(err)
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return
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}
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defer rows.Close()
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gorm.Scan(rows, db, false)
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}
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}
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}
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func BuildQuerySQL(db *gorm.DB) {
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if db.Statement.Schema != nil && !db.Statement.Unscoped {
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for _, c := range db.Statement.Schema.QueryClauses {
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db.Statement.AddClause(c)
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}
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}
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if db.Statement.SQL.String() == "" {
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db.Statement.SQL.Grow(100)
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clauseSelect := clause.Select{Distinct: db.Statement.Distinct}
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if db.Statement.ReflectValue.Kind() == reflect.Struct && db.Statement.ReflectValue.Type() == db.Statement.Schema.ModelType {
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var conds []clause.Expression
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for _, primaryField := range db.Statement.Schema.PrimaryFields {
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if v, isZero := primaryField.ValueOf(db.Statement.ReflectValue); !isZero {
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conds = append(conds, clause.Eq{Column: clause.Column{Table: db.Statement.Table, Name: primaryField.DBName}, Value: v})
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}
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}
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if len(conds) > 0 {
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db.Statement.AddClause(clause.Where{Exprs: conds})
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}
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}
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if len(db.Statement.Selects) > 0 {
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clauseSelect.Columns = make([]clause.Column, len(db.Statement.Selects))
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for idx, name := range db.Statement.Selects {
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if db.Statement.Schema == nil {
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clauseSelect.Columns[idx] = clause.Column{Name: name, Raw: true}
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} else if f := db.Statement.Schema.LookUpField(name); f != nil {
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clauseSelect.Columns[idx] = clause.Column{Name: f.DBName}
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} else {
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clauseSelect.Columns[idx] = clause.Column{Name: name, Raw: true}
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}
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}
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} else if db.Statement.Schema != nil && len(db.Statement.Omits) > 0 {
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selectColumns, _ := db.Statement.SelectAndOmitColumns(false, false)
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clauseSelect.Columns = make([]clause.Column, 0, len(db.Statement.Schema.DBNames))
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for _, dbName := range db.Statement.Schema.DBNames {
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if v, ok := selectColumns[dbName]; (ok && v) || !ok {
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clauseSelect.Columns = append(clauseSelect.Columns, clause.Column{Table: db.Statement.Table, Name: dbName})
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}
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}
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} else if db.Statement.Schema != nil && db.Statement.ReflectValue.IsValid() {
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if !db.QueryFields {
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smallerStruct := false
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switch db.Statement.ReflectValue.Kind() {
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case reflect.Struct:
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smallerStruct = db.Statement.ReflectValue.Type() != db.Statement.Schema.ModelType
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case reflect.Slice:
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smallerStruct = db.Statement.ReflectValue.Type().Elem() != db.Statement.Schema.ModelType
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}
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if smallerStruct {
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stmt := gorm.Statement{DB: db}
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// smaller struct
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if err := stmt.Parse(db.Statement.Dest); err == nil && stmt.Schema.ModelType != db.Statement.Schema.ModelType {
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clauseSelect.Columns = make([]clause.Column, len(stmt.Schema.DBNames))
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for idx, dbName := range stmt.Schema.DBNames {
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clauseSelect.Columns[idx] = clause.Column{Name: dbName}
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}
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}
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}
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} else {
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// Execute the query with all the fields of the table
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stmt := gorm.Statement{DB: db}
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// smaller struct
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if err := stmt.Parse(db.Statement.Dest); err == nil {
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clauseSelect.Columns = make([]clause.Column, len(stmt.Schema.DBNames))
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for idx, dbName := range stmt.Schema.DBNames {
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clauseSelect.Columns[idx] = clause.Column{Table: db.Statement.Table, Name: dbName}
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}
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}
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}
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}
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// inline joins
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if len(db.Statement.Joins) != 0 {
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if len(db.Statement.Selects) == 0 && db.Statement.Schema != nil {
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clauseSelect.Columns = make([]clause.Column, len(db.Statement.Schema.DBNames))
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for idx, dbName := range db.Statement.Schema.DBNames {
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clauseSelect.Columns[idx] = clause.Column{Table: db.Statement.Table, Name: dbName}
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}
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}
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joins := []clause.Join{}
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for _, join := range db.Statement.Joins {
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if db.Statement.Schema == nil {
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joins = append(joins, clause.Join{
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Expression: clause.Expr{SQL: join.Name, Vars: join.Conds},
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})
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} else if relation, ok := db.Statement.Schema.Relationships.Relations[join.Name]; ok {
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tableAliasName := relation.Name
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for _, s := range relation.FieldSchema.DBNames {
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clauseSelect.Columns = append(clauseSelect.Columns, clause.Column{
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Table: tableAliasName,
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Name: s,
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Alias: tableAliasName + "__" + s,
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})
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}
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exprs := make([]clause.Expression, len(relation.References))
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for idx, ref := range relation.References {
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if ref.OwnPrimaryKey {
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exprs[idx] = clause.Eq{
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Column: clause.Column{Table: clause.CurrentTable, Name: ref.PrimaryKey.DBName},
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Value: clause.Column{Table: tableAliasName, Name: ref.ForeignKey.DBName},
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}
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} else {
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if ref.PrimaryValue == "" {
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exprs[idx] = clause.Eq{
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Column: clause.Column{Table: clause.CurrentTable, Name: ref.ForeignKey.DBName},
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Value: clause.Column{Table: tableAliasName, Name: ref.PrimaryKey.DBName},
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}
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} else {
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exprs[idx] = clause.Eq{
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Column: clause.Column{Table: tableAliasName, Name: ref.ForeignKey.DBName},
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Value: ref.PrimaryValue,
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}
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}
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}
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}
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joins = append(joins, clause.Join{
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Type: clause.LeftJoin,
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Table: clause.Table{Name: relation.FieldSchema.Table, Alias: tableAliasName},
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ON: clause.Where{Exprs: exprs},
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})
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} else {
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joins = append(joins, clause.Join{
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Expression: clause.Expr{SQL: join.Name, Vars: join.Conds},
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})
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}
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}
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db.Statement.AddClause(clause.From{Joins: joins})
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} else {
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db.Statement.AddClauseIfNotExists(clause.From{})
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}
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db.Statement.AddClauseIfNotExists(clauseSelect)
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db.Statement.Build("SELECT", "FROM", "WHERE", "GROUP BY", "ORDER BY", "LIMIT", "FOR")
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}
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}
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func Preload(db *gorm.DB) {
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if db.Error == nil && len(db.Statement.Preloads) > 0 {
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preloadMap := map[string][]string{}
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for name := range db.Statement.Preloads {
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if name == clause.Associations {
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for _, rel := range db.Statement.Schema.Relationships.Relations {
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if rel.Schema == db.Statement.Schema {
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preloadMap[rel.Name] = []string{rel.Name}
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}
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}
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} else {
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preloadFields := strings.Split(name, ".")
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for idx := range preloadFields {
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preloadMap[strings.Join(preloadFields[:idx+1], ".")] = preloadFields[:idx+1]
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}
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}
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}
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preloadNames := make([]string, len(preloadMap))
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idx := 0
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for key := range preloadMap {
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preloadNames[idx] = key
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idx++
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}
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sort.Strings(preloadNames)
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for _, name := range preloadNames {
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var (
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curSchema = db.Statement.Schema
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preloadFields = preloadMap[name]
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rels = make([]*schema.Relationship, len(preloadFields))
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)
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for idx, preloadField := range preloadFields {
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if rel := curSchema.Relationships.Relations[preloadField]; rel != nil {
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rels[idx] = rel
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curSchema = rel.FieldSchema
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} else {
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db.AddError(fmt.Errorf("%v: %w", name, gorm.ErrUnsupportedRelation))
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}
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}
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if db.Error == nil {
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preload(db, rels, db.Statement.Preloads[name])
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}
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}
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}
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}
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func AfterQuery(db *gorm.DB) {
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if db.Error == nil && db.Statement.Schema != nil && !db.Statement.SkipHooks && db.Statement.Schema.AfterFind {
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callMethod(db, func(value interface{}, tx *gorm.DB) bool {
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if i, ok := value.(AfterFindInterface); ok {
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db.AddError(i.AfterFind(tx))
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return true
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}
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return false
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})
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}
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}
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