/
utils.go
154 lines (138 loc) · 3.36 KB
/
utils.go
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package rapier
import (
"reflect"
"strings"
"golang.org/x/exp/constraints"
"gorm.io/gorm"
"gorm.io/gorm/callbacks"
"gorm.io/gorm/clause"
)
func buildSelectValue(stmt *gorm.Statement, exprs ...Expr) (query string, args []any) {
if len(exprs) == 0 {
return "", nil
}
var queryItems []string
for _, e := range exprs {
sql, vars := e.BuildWithArgs(stmt)
queryItems = append(queryItems, sql)
args = append(args, vars...)
}
if len(args) == 0 {
return queryItems[0], intoAnySlice(queryItems[1:])
}
return strings.Join(queryItems, ","), args
}
func buildColumnsValue(db *gorm.DB, columns ...Expr) string {
stmt := &gorm.Statement{
DB: db.Statement.DB,
Table: db.Statement.Table,
Schema: db.Statement.Schema,
}
for i, column := range columns {
if i != 0 {
_ = stmt.WriteByte(',')
}
column.Build(stmt)
}
return stmt.SQL.String()
}
// buildClauseSet build all set
func buildClauseSet(db *gorm.DB, exprs []AssignExpr) (set clause.Set) {
for _, expr := range exprs {
column := clause.Column{
Table: "", // FIXME: when need table?.
Name: expr.ColumnName(),
}
switch e := expr.SetExpr().(type) {
case clause.Expr:
set = append(set, clause.Assignment{
Column: column,
Value: e,
})
case clause.Eq:
set = append(set, clause.Assignment{
Column: column,
Value: e.Value,
})
case clause.Set:
set = append(set, e...)
}
}
stmt := db.Session(&gorm.Session{}).Statement
stmt.Dest = map[string]any{}
return append(set, callbacks.ConvertToAssignments(stmt)...)
}
func buildAttrsValue(attrs []AssignExpr) []any {
values := make([]any, 0, len(attrs))
for _, expr := range attrs {
switch e := expr.SetExpr().(type) {
case clause.Eq:
values = append(values, e)
case clause.Set:
for _, v := range e {
values = append(values, clause.Eq{
Column: v.Column,
Value: v.Value,
})
}
}
}
return values
}
func buildColumnName(columns ...Expr) []string {
vs := make([]string, 0, len(columns))
for _, v := range columns {
vs = append(vs, v.ColumnName())
}
return vs
}
// IntoExpression convert Expr to clause.Expression
func IntoExpression(conds ...Expr) []clause.Expression {
exprs := make([]clause.Expression, len(conds))
for i, cond := range conds {
if cond != nil {
exprs[i] = cond.Expression()
}
}
return exprs
}
func intoAnySlice[T any](values []T) []any {
slices := make([]any, len(values))
for i, v := range values {
slices[i] = v
}
return slices
}
func IntoSlice[T any, R any](values []T, f func(T) R) []R {
slices := make([]R, len(values))
for i, v := range values {
slices[i] = f(v)
}
return slices
}
func IntoIntegerSlice[T constraints.Integer, R constraints.Integer](values []T) []R {
slices := make([]R, len(values))
for i, v := range values {
slices[i] = R(v)
}
return slices
}
// intoClauseIN clause.IN{} OR EmptyExpr() expression
func intoClauseIN(column, value any) clause.Expression {
reflectValue := reflect.Indirect(reflect.ValueOf(value))
for reflectValue.Kind() == reflect.Ptr {
reflectValue = reflectValue.Elem()
}
kind := reflectValue.Kind()
if kind == reflect.Slice || kind == reflect.Array {
valueLen := reflectValue.Len()
values := make([]any, valueLen)
for i := 0; i < valueLen; i++ {
values[i] = reflectValue.Index(i).Interface()
}
if len(values) > 0 {
return clause.IN{Column: column, Values: values}
}
}
return EmptyExpr()
}