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clause.go
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clause.go
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package helper
import (
"strings"
"gorm.io/gorm/clause"
)
// Cond ...
type Cond struct {
Cond bool
Result string
}
// IfClause if clause
func IfClause(conds []Cond) string {
judge := func(c Cond) string {
if c.Cond {
return c.Result
}
return ""
}
clauses := make([]string, len(conds))
for i, cond := range conds {
clauses[i] = strings.Trim(judge(cond), " ")
}
return " " + strings.Join(clauses, " ")
}
// WhereClause where clause
func WhereClause(conds []string) string {
return joinClause(conds, "WHERE", whereValue, " ")
}
// SetClause set clause
func SetClause(conds []string) string {
return joinClause(conds, "SET", setValue, ",")
}
func joinClause(conds []string, keyword string, deal func(string) string, sep string) string {
clauses := make([]string, len(conds))
for i, clause := range conds {
clauses[i] = deal(clause)
}
sql := trimAll(strings.Join(clauses, sep))
if sql != "" {
sql = " " + keyword + " " + sql
}
return sql
}
func trimAll(input string) string {
return trimRight(trimLeft(input))
}
func trimLeft(input string) string {
input = strings.TrimSpace(input)
lowercase := strings.ToLower(input)
switch {
case strings.HasPrefix(lowercase, "and "):
return input[4:]
case strings.HasPrefix(lowercase, "or "):
return input[3:]
case strings.HasPrefix(lowercase, "xor "):
return input[4:]
case strings.HasPrefix(lowercase, ","):
return input[1:]
default:
return input
}
}
func trimRight(input string) string {
input = strings.TrimSpace(input)
lowercase := strings.ToLower(input)
switch {
case strings.HasSuffix(lowercase, " and"):
return input[:len(input)-3]
case strings.HasSuffix(lowercase, " or"):
return input[:len(input)-2]
case strings.HasSuffix(lowercase, " xor"):
return input[:len(input)-3]
case strings.HasSuffix(lowercase, ","):
return input[:len(input)-1]
default:
return input
}
}
// whereValue append a new condition with prefix "AND"
func whereValue(value string) string {
value = strings.Trim(value, " ")
lowercase := strings.ToLower(value)
switch {
case lowercase == "":
return ""
case strings.HasPrefix(lowercase, "and "):
return value
case strings.HasPrefix(lowercase, "or "):
return value
case strings.HasPrefix(lowercase, "xor "):
return value
default:
return "AND " + value
}
}
func setValue(value string) string {
return strings.Trim(value, ", ")
}
// JoinWhereBuilder join where builder
func JoinWhereBuilder(src *strings.Builder, whereValue strings.Builder) {
value := trimAll(whereValue.String())
if value != "" {
src.WriteString("WHERE ")
src.WriteString(value)
src.WriteString(" ")
}
}
// JoinSetBuilder join set builder
func JoinSetBuilder(src *strings.Builder, setValue strings.Builder) {
value := trimAll(setValue.String())
if value != "" {
src.WriteString("SET ")
src.WriteString(value)
src.WriteString(" ")
}
}
// JoinTrimAllBuilder join trim builder, will trim and,or,xor, `,`
func JoinTrimAllBuilder(src *strings.Builder, setValue strings.Builder) {
src.WriteString(trimAll(setValue.String()))
src.WriteString(" ")
}
// JoinTblExpr join clause with table expression(sub query...)
type JoinTblExpr struct {
clause.Join
TableExpr clause.Expression
}
// NewJoinTblExpr create new join table expr
func NewJoinTblExpr(join clause.Join, tbExpr clause.Expression) JoinTblExpr {
return JoinTblExpr{Join: join, TableExpr: tbExpr}
}
// Build ...
func (join JoinTblExpr) Build(builder clause.Builder) {
if builder == nil {
return
}
if join.Type != "" {
_, _ = builder.WriteString(string(join.Type))
_ = builder.WriteByte(' ')
}
_, _ = builder.WriteString("JOIN ")
if join.TableExpr != nil {
join.TableExpr.Build(builder)
}
if len(join.ON.Exprs) > 0 {
_, _ = builder.WriteString(" ON ")
join.ON.Build(builder)
} else if len(join.Using) > 0 {
_, _ = builder.WriteString(" USING (")
for idx, c := range join.Using {
if idx > 0 {
_ = builder.WriteByte(',')
}
builder.WriteQuoted(c)
}
_ = builder.WriteByte(')')
}
}