/
subquery.go
75 lines (72 loc) · 2 KB
/
subquery.go
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package specifications
import (
"fmt"
"github.com/aacfactory/errors"
"github.com/aacfactory/fns-contrib/databases/sql/dac/conditions"
"github.com/aacfactory/fns/commons/bytex"
"io"
)
type QueryExpr struct {
conditions.QueryExpr
}
func (expr QueryExpr) Render(ctx Context, w io.Writer) (argument []any, err error) {
switch query := expr.Query.(type) {
case string:
if expr.Cond.Exist() {
err = errors.Warning("sql: sub query render failed").WithCause(fmt.Errorf("literal sub query can not has condition"))
return
}
_, _ = w.Write(LB)
_, _ = w.Write(bytex.FromString(query))
_, _ = w.Write(RB)
if err != nil {
err = errors.Warning("sql: sub query render failed").WithCause(err)
return
}
break
default:
tableNames, hasTableNames := ctx.Localization(query)
if !hasTableNames {
err = errors.Warning("sql: sub query render failed").WithCause(fmt.Errorf("%s was not found in localization", query))
return
}
tableName := tableNames[0]
if len(tableNames) == 2 {
tableName = fmt.Sprintf("%s.%s", tableNames[0], tableNames[1])
}
ctx = SwitchKey(ctx, query)
column, hasColumn := ctx.Localization(expr.Field)
if !hasColumn {
err = errors.Warning("sql: sub query render failed").WithCause(fmt.Errorf("%s was not found in localization", expr.Field))
return
}
_, _ = w.Write(LB)
_, _ = w.Write(SELECT)
_, _ = w.Write(SPACE)
if expr.Aggregate == "" {
_, _ = w.Write(bytex.FromString(column[0]))
} else {
_, _ = w.Write(bytex.FromString(expr.Aggregate))
_, _ = w.Write(LB)
_, _ = w.Write(bytex.FromString(column[0]))
_, _ = w.Write(RB)
}
_, _ = w.Write(SPACE)
_, _ = w.Write(FROM)
_, _ = w.Write(SPACE)
_, _ = w.Write(bytex.FromString(tableName))
if expr.Cond.Exist() {
_, _ = w.Write(SPACE)
_, _ = w.Write(WHERE)
_, _ = w.Write(SPACE)
argument, err = Condition{expr.Cond}.Render(ctx, w)
if err != nil {
err = errors.Warning("sql: sub query render failed").WithCause(err)
return
}
}
_, _ = w.Write(RB)
break
}
return
}