tdengine-mapper-go/insert_build.go

package tdmap

import (
	"database/sql"
	"fmt"
	"reflect"
	"strings"
	"time"
)

// buildInsertStatementForSuperTable 构建超级表插入语句
// @param rows 同一超级表下的数据行
// @return 插入语句
func buildInsertStatementForSuperTable(rows ...*TableRowMateria) (string, error) {
	if len(rows) == 0 {
		return "", fmt.Errorf("no rows provided for super table insert")
	}

	var sb strings.Builder

	// 格式化标签列和值
	formattedTagColumns := formatColumns(rows[0].TagColumns...)
	formattedTagValues := formatRowValues(rows[0].TagValues...)
	formattedColumns := formatColumns(rows[0].Columns...)

	formattedSuperTableName := formatIdentifier(rows[0].SuperTableName)
	formattedTableName := formatIdentifier(rows[0].TableName)

	/*
			   insert into `dev_001`
		       using `super_dev` (`dev_id`,`dev_type`) tags ('A001','电表')
					(`ts`,`aV`,`bV`,`aI`,`bI`) values
						('2024-09-01T00:00:00+08:00','220','221','20.0','20.1'),
						('2024-09-02T00:00:00+08:00','220','221','20.0','20.1')
	*/

	// 构建插入语句头部
	sb.WriteString(fmt.Sprintf("%s USING %s %s TAGS %s %s VALUES ",
		formattedTableName, formattedSuperTableName,
		formattedTagColumns,
		formattedTagValues,
		formattedColumns,
	))

	// 添加每行的值
	for i, row := range rows {
		if i > 0 {
			sb.WriteString(",")
		}
		sb.WriteString(formatRowValues(row.Values...))
	}

	return sb.String(), nil
}

// buildInsertStatementForNormalTable 普通表插入构建
// @param data 数据 当前应该是同一个表的
// @return 插入语句  表名1 (列名) VALUES (),()
func buildInsertStatementForNormalTable(rows ...*TableRowMateria) (string, error) {
	if len(rows) == 0 {
		return "", fmt.Errorf("no data provided for normal table insert")
	}

	var sb strings.Builder
	formattedColumns := formatColumns(append(rows[0].TagColumns, rows[0].Columns...)...)
	formattedTableName := formatIdentifier(rows[0].TableName)

	/*
		   insert into `dev_001`
				(`ts`,`aV`,`bV`,`aI`,`bI`) values
					('2024-09-01T00:00:00+08:00','220','221','20.0','20.1'),
					('2024-09-02T00:00:00+08:00','220','221','20.0','20.1')
	*/

	// 构建插入语句头部
	sb.WriteString(fmt.Sprintf("%s %s VALUES ", formattedTableName, formattedColumns))

	// 添加每行的值
	for i, row := range rows {
		if i > 0 {
			sb.WriteString(",")
		}
		sb.WriteString(formatRowValues(append(row.TagValues, row.Values...)...))
	}

	return sb.String(), nil
}

// formatRowValues 格式化单行的值并返回格式化后的字符串
// @param values 单行的值
// @return 格式化后的字符串 ('a',12.3,true,)
func formatRowValues(values ...any) string {
	formattedValues := make([]string, len(values))
	for i, val := range values {
		switch v := val.(type) {
		case sql.NullBool:
			if v.Valid {
				formattedValues[i] = fmt.Sprintf("%v", v.Bool)
			} else {
				formattedValues[i] = "null"
			}
		case sql.NullByte:
			if v.Valid {
				formattedValues[i] = fmt.Sprintf("%v", v.Byte)
			} else {
				formattedValues[i] = "null"
			}
		case sql.NullFloat64:
			if v.Valid {
				formattedValues[i] = fmt.Sprintf("%v", v.Float64)
			} else {
				formattedValues[i] = "null"
			}
		case sql.NullInt64:
			if v.Valid {
				formattedValues[i] = fmt.Sprintf("%v", v.Int64)
			} else {
				formattedValues[i] = "null"
			}
		case sql.NullInt32:
			if v.Valid {
				formattedValues[i] = fmt.Sprintf("%v", v.Int32)
			} else {
				formattedValues[i] = "null"
			}
		case sql.NullInt16:
			if v.Valid {
				formattedValues[i] = fmt.Sprintf("%v", v.Int16)
			} else {
				formattedValues[i] = "null"
			}
		case sql.NullString:
			if v.Valid {
				formattedValues[i] = fmt.Sprintf("'%s'", v.String)
			} else {
				formattedValues[i] = "null"
			}
		case sql.NullTime:
			if v.Valid {
				formattedValues[i] = fmt.Sprintf("'%s'", v.Time.Format(time.RFC3339))
			} else {
				formattedValues[i] = "null"
			}
		case string:
			formattedValues[i] = fmt.Sprintf("'%s'", v)
		case rune: // rune 转换为 string
			formattedValues[i] = fmt.Sprintf("'%s'", string(v))
		case nil:
			formattedValues[i] = "null"
		case time.Time:
			formattedValues[i] = fmt.Sprintf("'%s'", v.Format(time.RFC3339))
		default:
			if reflect.TypeOf(val).Kind() == reflect.Ptr && reflect.ValueOf(val).IsNil() {
				formattedValues[i] = "null"
				continue
			}
			formattedValues[i] = fmt.Sprintf("%v", val)
		}
	}
	return "(" + strings.Join(formattedValues, ",") + ")"
}

// formatIdentifier 为表名或超级表名添加反引号
// @param identifier 表名或超级表名
// @return 格式化后的字符串 `tableName`
func formatIdentifier(identifier string) string {
	return fmt.Sprintf("`%s`", identifier)
}

// formatColumns 为列名添加反引号
// @param columns 列名
func formatColumns(columns ...string) string {
	formatted := make([]string, len(columns))
	for i, col := range columns {
		formatted[i] = fmt.Sprintf("`%s`", col)
	}
	return "(" + strings.Join(formatted, ",") + ")"
}