mirror of
https://gitee.com/dromara/mayfly-go
synced 2025-12-10 01:40:25 +08:00
251 lines
8.1 KiB
Go
251 lines
8.1 KiB
Go
package dm
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import (
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"database/sql"
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"fmt"
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"mayfly-go/internal/db/dbm/dbi"
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"mayfly-go/pkg/logx"
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"mayfly-go/pkg/utils/anyx"
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"mayfly-go/pkg/utils/collx"
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"mayfly-go/pkg/utils/stringx"
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"regexp"
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"strings"
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"time"
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"github.com/kanzihuang/vitess/go/vt/sqlparser"
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_ "gitee.com/chunanyong/dm"
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)
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type DMDialect struct {
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dc *dbi.DbConn
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}
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func (dd *DMDialect) GetMetaData() dbi.MetaData {
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return &DMMetaData{
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dc: dd.dc,
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}
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}
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// GetDbProgram 获取数据库程序模块，用于数据库备份与恢复
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func (dd *DMDialect) GetDbProgram() (dbi.DbProgram, error) {
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return nil, fmt.Errorf("该数据库类型不支持数据库备份与恢复: %v", dd.dc.Info.Type)
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}
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var (
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// 数字类型
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numberRegexp = regexp.MustCompile(`(?i)int|double|float|number|decimal|byte|bit`)
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// 日期时间类型
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datetimeRegexp = regexp.MustCompile(`(?i)datetime|timestamp`)
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// 日期类型
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dateRegexp = regexp.MustCompile(`(?i)date`)
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// 时间类型
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timeRegexp = regexp.MustCompile(`(?i)time`)
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converter = new(DataConverter)
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)
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func (dd *DMDialect) BatchInsert(tx *sql.Tx, tableName string, columns []string, values [][]any, duplicateStrategy int) (int64, error) {
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// 执行批量insert sql
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// insert into "table_name" ("column1", "column2", ...) values (value1, value2, ...)
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dbType := dd.dc.Info.Type
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// 无需处理重复数据，直接执行批量insert
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if duplicateStrategy == dbi.DuplicateStrategyNone || duplicateStrategy == 0 {
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return dd.batchInsertSimple(dbType, tx, tableName, columns, values)
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} else { // 执行MERGE INTO语句
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return dd.batchInsertMerge(dbType, tx, tableName, columns, values)
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}
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}
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func (dd *DMDialect) batchInsertSimple(dbType dbi.DbType, tx *sql.Tx, tableName string, columns []string, values [][]any) (int64, error) {
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// 生成占位符字符串：如：(?,?)
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// 重复字符串并用逗号连接
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repeated := strings.Repeat("?,", len(columns))
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// 去除最后一个逗号，占位符由括号包裹
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placeholder := fmt.Sprintf("(%s)", strings.TrimSuffix(repeated, ","))
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sqlTemp := fmt.Sprintf("insert into %s (%s) values %s", dbType.QuoteIdentifier(tableName), strings.Join(columns, ","), placeholder)
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effRows := 0
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for _, value := range values {
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// 达梦数据库只能一条条的执行insert
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res, err := dd.dc.TxExec(tx, sqlTemp, value...)
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if err != nil {
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logx.Errorf("执行sql失败：%s, sql: [ %s ]", err.Error(), sqlTemp)
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}
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effRows += int(res)
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}
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// 执行批量insert sql
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return int64(effRows), nil
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}
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func (dd *DMDialect) batchInsertMerge(dbType dbi.DbType, tx *sql.Tx, tableName string, columns []string, values [][]any) (int64, error) {
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// 查询主键字段
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uniqueCols := make([]string, 0)
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caseSqls := make([]string, 0)
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metadata := dd.GetMetaData()
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tableCols, _ := metadata.GetColumns(tableName)
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identityCols := make([]string, 0)
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for _, col := range tableCols {
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if col.IsPrimaryKey {
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uniqueCols = append(uniqueCols, col.ColumnName)
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caseSqls = append(caseSqls, fmt.Sprintf("( T1.%s = T2.%s )", dbType.QuoteIdentifier(col.ColumnName), dbType.QuoteIdentifier(col.ColumnName)))
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}
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if col.IsIdentity {
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// 自增字段不放入insert内，即使是设置了identity_insert on也不起作用
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identityCols = append(identityCols, dbType.QuoteIdentifier(col.ColumnName))
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}
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}
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// 查询唯一索引涉及到的字段，并组装到match条件内
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indexs, _ := metadata.GetTableIndex(tableName)
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if indexs != nil {
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for _, index := range indexs {
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if index.IsUnique {
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cols := strings.Split(index.ColumnName, ",")
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tmp := make([]string, 0)
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for _, col := range cols {
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uniqueCols = append(uniqueCols, col)
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tmp = append(tmp, fmt.Sprintf(" T1.%s = T2.%s ", dbType.QuoteIdentifier(col), dbType.QuoteIdentifier(col)))
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}
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caseSqls = append(caseSqls, fmt.Sprintf("( %s )", strings.Join(tmp, " AND ")))
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}
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}
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}
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// 重复数据处理策略
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phs := make([]string, 0)
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insertVals := make([]string, 0)
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upds := make([]string, 0)
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insertCols := make([]string, 0)
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for _, column := range columns {
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phs = append(phs, fmt.Sprintf("? %s", column))
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if !collx.ArrayContains(uniqueCols, dbType.RemoveQuote(column)) {
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upds = append(upds, fmt.Sprintf("T1.%s = T2.%s", column, column))
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}
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if !collx.ArrayContains(identityCols, column) {
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insertCols = append(insertCols, fmt.Sprintf("%s", column))
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insertVals = append(insertVals, fmt.Sprintf("T2.%s", column))
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}
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}
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t2s := make([]string, 0)
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for i := 0; i < len(values); i++ {
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t2s = append(t2s, fmt.Sprintf("SELECT %s FROM dual", strings.Join(phs, ",")))
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}
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t2 := strings.Join(t2s, " UNION ALL ")
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sqlTemp := "MERGE INTO " + dbType.QuoteIdentifier(tableName) + " T1 USING (" + t2 + ") T2 ON " + strings.Join(caseSqls, " OR ")
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sqlTemp += "WHEN NOT MATCHED THEN INSERT (" + strings.Join(insertCols, ",") + ") VALUES (" + strings.Join(insertVals, ",") + ")"
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sqlTemp += "WHEN MATCHED THEN UPDATE SET " + strings.Join(upds, ",")
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// 把二维数组转为一维数组
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var args []any
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for _, v := range values {
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args = append(args, v...)
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}
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return dd.dc.TxExec(tx, sqlTemp, args...)
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}
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func (dd *DMDialect) GetDataConverter() dbi.DataConverter {
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return converter
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}
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type DataConverter struct {
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}
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func (dd *DataConverter) GetDataType(dbColumnType string) dbi.DataType {
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if numberRegexp.MatchString(dbColumnType) {
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return dbi.DataTypeNumber
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}
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if datetimeRegexp.MatchString(dbColumnType) {
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return dbi.DataTypeDateTime
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}
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if dateRegexp.MatchString(dbColumnType) {
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return dbi.DataTypeDate
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}
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if timeRegexp.MatchString(dbColumnType) {
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return dbi.DataTypeTime
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}
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return dbi.DataTypeString
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}
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func (dd *DataConverter) FormatData(dbColumnValue any, dataType dbi.DataType) string {
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str := anyx.ToString(dbColumnValue)
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switch dataType {
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case dbi.DataTypeDateTime: // "2024-01-02T22:08:22.275697+08:00"
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res, _ := time.Parse(time.RFC3339, str)
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return res.Format(time.DateTime)
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case dbi.DataTypeDate: // "2024-01-02T00:00:00+08:00"
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res, _ := time.Parse(time.RFC3339, str)
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return res.Format(time.DateOnly)
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case dbi.DataTypeTime: // "0000-01-01T22:08:22.275688+08:00"
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res, _ := time.Parse(time.RFC3339, str)
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return res.Format(time.TimeOnly)
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}
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return str
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}
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func (dd *DataConverter) ParseData(dbColumnValue any, dataType dbi.DataType) any {
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// 如果dataType是datetime而dbColumnValue是string类型，则需要转换为time.Time类型
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_, ok := dbColumnValue.(string)
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if ok {
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if dataType == dbi.DataTypeDateTime {
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res, _ := time.Parse(time.RFC3339, anyx.ToString(dbColumnValue))
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return res
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}
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if dataType == dbi.DataTypeDate {
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res, _ := time.Parse(time.DateOnly, anyx.ToString(dbColumnValue))
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return res
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}
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if dataType == dbi.DataTypeTime {
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res, _ := time.Parse(time.TimeOnly, anyx.ToString(dbColumnValue))
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return res
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}
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}
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return dbColumnValue
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}
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func (dd *DMDialect) CopyTable(copy *dbi.DbCopyTable) error {
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tableName := copy.TableName
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metadata := dd.GetMetaData()
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ddl, err := metadata.GetTableDDL(tableName)
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if err != nil {
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return err
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}
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// 生成新表名,为老表明+_copy_时间戳
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newTableName := tableName + "_copy_" + time.Now().Format("20060102150405")
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// 替换新表名
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ddl = strings.ReplaceAll(ddl, fmt.Sprintf("\"%s\"", strings.ToUpper(tableName)), fmt.Sprintf("\"%s\"", strings.ToUpper(newTableName)))
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// 去除空格换行
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ddl = stringx.TrimSpaceAndBr(ddl)
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sqls, err := sqlparser.SplitStatementToPieces(ddl, sqlparser.WithDialect(dd.dc.Info.Type.Dialect()))
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for _, sql := range sqls {
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_, _ = dd.dc.Exec(sql)
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}
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// 复制数据
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if copy.CopyData {
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go func() {
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// 设置允许填充自增列之后，显示指定列名可以插入自增列
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_, _ = dd.dc.Exec(fmt.Sprintf("set identity_insert \"%s\" on", newTableName))
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// 获取列名
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columns, _ := metadata.GetColumns(tableName)
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columnArr := make([]string, 0)
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for _, column := range columns {
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columnArr = append(columnArr, fmt.Sprintf("\"%s\"", column.ColumnName))
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}
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columnStr := strings.Join(columnArr, ",")
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// 插入新数据并显示指定列
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_, _ = dd.dc.Exec(fmt.Sprintf("insert into \"%s\" (%s) select %s from \"%s\"", newTableName, columnStr, columnStr, tableName))
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// 执行完成后关闭允许填充自增列
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_, _ = dd.dc.Exec(fmt.Sprintf("set identity_insert \"%s\" off", newTableName))
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}()
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}
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return err
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}
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