sql-builder/db/build.go

package db

import (
	"fmt"
	"strings"

	"git.botann.com/lijun/sql-builder/util"
)

func (s *SqlBuilder[T]) buildSql() string {
	s.buildSelect()
	s.buildGroup()
	s.buildOrder()
	s.buildPartition()
	s.buildCondition()
	return s.Sql
}

func (s *SqlBuilder[T]) buildPaginateSql(sqls string) string {
	s.Opts.Page.Init()
	pageIndex := s.Opts.Page.GetPageIndex()
	pageSize := s.Opts.Page.GetPageSize()
	return fmt.Sprintf("%s limit %d offset %d", sqls, pageSize, (pageIndex-1)*pageSize)
}

func (s *SqlBuilder[T]) buildCountSql(sqls string) string {
	return fmt.Sprintf("select count(1) from (%s) as t", sqls)
}

func (s *SqlBuilder[T]) buildSelect() {
	for i, v := range s.Opts.selects {
		n := i + 1
		// 如果是最后一个select字段，则不加逗号
		if i == len(s.Opts.selects) {
			s.Sql = strings.Replace(s.Sql, util.SelectPlaceholder, fmt.Sprintf("%s", v), n)
		} else {
			s.Sql = strings.Replace(s.Sql, util.SelectPlaceholder, fmt.Sprintf("%s,", v), n)
		}
	}
	s.Sql = strings.Replace(s.Sql, util.SelectPlaceholder, "", -1)
}

func (s *SqlBuilder[T]) buildCondition() {
	for i, v := range s.Opts.conditions {
		n := i + 1
		s.Sql = strings.Replace(s.Sql, util.ConditionPlaceholder, fmt.Sprintf(" and %s", v), n)
	}
	s.Sql = strings.Replace(s.Sql, util.ConditionPlaceholder, "", -1)
}

func (s *SqlBuilder[T]) buildGroup() {
	for i, v := range s.Opts.groups {
		n := i + 1
		// 如果是最后一个group字段，则不加逗号
		if n == len(s.Opts.groups) {
			s.Sql = strings.Replace(s.Sql, util.GroupPlaceholder, fmt.Sprintf(" %s", v), n)
		} else {
			s.Sql = strings.Replace(s.Sql, util.GroupPlaceholder, fmt.Sprintf(" %s,", v), n)
		}
	}
	s.Sql = strings.Replace(s.Sql, util.GroupPlaceholder, "", -1)
}

func (s *SqlBuilder[T]) buildOrder() {
	for i, v := range s.Opts.orders {
		n := i + 1
		// 如果是最后一个order字段，则不加逗号
		if n == len(s.Opts.orders) {
			s.Sql = strings.Replace(s.Sql, util.OrderPlaceholder, fmt.Sprintf(" %s", v), n)
		} else {
			s.Sql = strings.Replace(s.Sql, util.OrderPlaceholder, fmt.Sprintf(" %s,", v), n)
		}
	}
	s.Sql = strings.Replace(s.Sql, util.OrderPlaceholder, "", -1)
}

// tdengine专用
func (s *SqlBuilder[T]) buildPartition() {
	for i, v := range s.Opts.partitions {
		n := i + 1
		// 如果是最后一个partition字段，则不加逗号
		if n == len(s.Opts.partitions) {
			s.Sql = strings.Replace(s.Sql, util.PartitionPlaceholder, fmt.Sprintf(" %s", v), n)
		} else {
			s.Sql = strings.Replace(s.Sql, util.PartitionPlaceholder, fmt.Sprintf(" %s,", v), n)
		}
	}
	s.Sql = strings.Replace(s.Sql, util.PartitionPlaceholder, "", -1)
}