mirror of
https://gitee.com/dromara/mayfly-go
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299 lines
8.9 KiB
Go
299 lines
8.9 KiB
Go
package mssql
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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/collx"
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"strings"
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"time"
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)
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var (
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mssqlQuoter = dbi.Quoter{
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Prefix: '[',
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Suffix: ']',
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IsReserved: dbi.AlwaysReserve,
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}
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)
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type MssqlDialect struct {
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dbi.DefaultDialect
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dc *dbi.DbConn
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}
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func (md *MssqlDialect) BatchInsert(tx *sql.Tx, tableName string, columns []string, values [][]any, duplicateStrategy int) (int64, error) {
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if duplicateStrategy == dbi.DuplicateStrategyUpdate {
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return md.batchInsertMerge(tx, tableName, columns, values, duplicateStrategy)
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}
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return md.batchInsertSimple(tx, tableName, columns, values, duplicateStrategy)
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}
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func (md *MssqlDialect) batchInsertSimple(tx *sql.Tx, tableName string, columns []string, values [][]any, duplicateStrategy int) (int64, error) {
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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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var singleSize int // 一条数据的参数个数
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for i, v := range values {
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if i == 0 {
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singleSize = len(v)
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}
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args = append(args, v...)
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}
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// 判断如果参数超过2000，则分批次执行，mssql允许最大参数为2100，保险起见，这里限制到2000
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if len(args) > 2000 {
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rows := 2000 / singleSize // 每批次最大数据条数
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mp := make(map[any][][]any)
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// 把values拆成多份，每份不能超过rows条
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length := len(values)
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for i := 0; i < length; i += rows {
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if i+rows <= length {
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mp[i] = values[i : i+rows]
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} else {
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mp[i] = values[i:length]
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}
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}
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var count int64
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for _, v := range mp {
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res, err := md.batchInsertSimple(tx, tableName, columns, v, duplicateStrategy)
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if err != nil {
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return count, err
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}
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count += res
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}
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return count, nil
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}
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msMetadata := md.dc.GetMetadata()
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schema := md.dc.Info.CurrentSchema()
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ignoreDupSql := ""
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if duplicateStrategy == dbi.DuplicateStrategyIgnore {
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// ALTER TABLE dbo.TEST ADD CONSTRAINT uniqueRows UNIQUE (ColA, ColB, ColC, ColD) WITH (IGNORE_DUP_KEY = ON)
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indexs, _ := msMetadata.(*MssqlMetadata).getTableIndexWithPK(tableName)
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// 收集唯一索引涉及到的字段
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uniqueColumns := make([]string, 0)
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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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for _, col := range cols {
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if !collx.ArrayContains(uniqueColumns, col) {
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uniqueColumns = append(uniqueColumns, col)
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}
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}
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}
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}
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if len(uniqueColumns) > 0 {
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// 设置忽略重复键
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ignoreDupSql = fmt.Sprintf("ALTER TABLE %s.%s ADD CONSTRAINT uniqueRows UNIQUE (%s) WITH (IGNORE_DUP_KEY = {sign})", schema, tableName, strings.Join(uniqueColumns, ","))
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_, _ = md.dc.TxExec(tx, strings.ReplaceAll(ignoreDupSql, "{sign}", "ON"))
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}
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}
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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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// 重复占位符字符串n遍
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repeated = strings.Repeat(placeholder+",", len(values))
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// 去除最后一个逗号
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placeholder = strings.TrimSuffix(repeated, ",")
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quote := md.Quoter().Quote
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baseTable := fmt.Sprintf("%s.%s", quote(schema), quote(tableName))
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sqlStr := fmt.Sprintf("insert into %s (%s) values %s", baseTable, strings.Join(columns, ","), placeholder)
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// 执行批量insert sql
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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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identityInsertOn := fmt.Sprintf("SET IDENTITY_INSERT [%s].[%s] ON", schema, tableName)
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res, err := md.dc.TxExec(tx, fmt.Sprintf("%s %s", identityInsertOn, sqlStr), args...)
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// 执行完之后，设置忽略重复键
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if ignoreDupSql != "" {
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_, _ = md.dc.TxExec(tx, strings.ReplaceAll(ignoreDupSql, "{sign}", "OFF"))
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}
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return res, err
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}
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func (md *MssqlDialect) batchInsertMerge(tx *sql.Tx, tableName string, columns []string, values [][]any, duplicateStrategy int) (int64, error) {
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msMetadata := md.dc.GetMetadata()
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schema := md.dc.Info.CurrentSchema()
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quote := md.Quoter().Quote
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// 收集MERGE 语句的 ON 子句条件
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caseSqls := make([]string, 0)
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pkCols := make([]string, 0)
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// 查询取出自增列字段, merge update不能修改自增列
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identityCols := make([]string, 0)
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cols, err := msMetadata.GetColumns(tableName)
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if err != nil {
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return 0, err
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}
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for _, col := range cols {
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if col.IsIdentity {
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identityCols = append(identityCols, col.ColumnName)
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}
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if col.IsPrimaryKey {
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pkCols = append(pkCols, col.ColumnName)
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name := quote(col.ColumnName)
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caseSqls = append(caseSqls, fmt.Sprintf(" T1.%s = T2.%s ", name, name))
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}
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}
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if len(pkCols) == 0 {
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return md.batchInsertSimple(tx, tableName, columns, values, duplicateStrategy)
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}
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// 重复数据处理策略
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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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// 源数据占位sql
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phs := make([]string, 0)
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for _, column := range columns {
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if !collx.ArrayContains(identityCols, md.Quoter().Trim(column)) {
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upds = append(upds, fmt.Sprintf("T1.%s = T2.%s", column, column))
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}
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insertCols = append(insertCols, column)
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insertVals = append(insertVals, fmt.Sprintf("T2.%s", column))
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phs = append(phs, fmt.Sprintf("? %s", column))
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}
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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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tmp := fmt.Sprintf("select %s", strings.Join(phs, ","))
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t2s := make([]string, 0)
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for _, v := range values {
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args = append(args, v...)
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t2s = append(t2s, tmp)
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}
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t2 := strings.Join(t2s, " UNION ALL ")
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sqlTemp := "MERGE INTO " + quote(schema) + "." + quote(tableName) + " T1 USING (" + t2 + ") T2 ON " + strings.Join(caseSqls, " AND ")
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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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// 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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identityInsertOn := fmt.Sprintf("SET IDENTITY_INSERT [%s].[%s] ON", schema, tableName)
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// 执行merge sql,必须要以分号结尾
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res, err := md.dc.TxExec(tx, fmt.Sprintf("%s %s;", identityInsertOn, sqlTemp), args...)
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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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return res, err
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}
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func (md *MssqlDialect) CopyTable(copy *dbi.DbCopyTable) error {
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msMetadata := md.dc.GetMetadata()
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schema := md.dc.Info.CurrentSchema()
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// 生成新表名,为老表明+_copy_时间戳
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newTableName := copy.TableName + "_copy_" + time.Now().Format("20060102150405")
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// 复制建表语句
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ddl, err := md.CopyTableDDL(copy.TableName, newTableName)
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if err != nil {
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return err
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}
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// 执行建表
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_, err = md.dc.Exec(ddl)
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if err != nil {
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return err
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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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// 查询所有的列
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columns, err := msMetadata.GetColumns(copy.TableName)
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if err != nil {
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logx.Warnf("复制表[%s]数据失败: %s", copy.TableName, err.Error())
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return
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}
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// 取出每列名, 需要显示指定列名插入数据
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columnNames := make([]string, 0)
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hasIdentity := false
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for _, v := range columns {
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columnNames = append(columnNames, fmt.Sprintf("[%s]", v.ColumnName))
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if v.IsIdentity {
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hasIdentity = true
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}
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}
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columnsSql := strings.Join(columnNames, ",")
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// 复制数据
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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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identityInsertOn := ""
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if hasIdentity {
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identityInsertOn = fmt.Sprintf("SET IDENTITY_INSERT [%s].[%s] ON", schema, newTableName)
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}
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_, err = md.dc.Exec(fmt.Sprintf(" %s INSERT INTO [%s].[%s] (%s) SELECT * FROM [%s].[%s]", identityInsertOn, schema, newTableName, columnsSql, schema, copy.TableName))
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if err != nil {
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logx.Warnf("复制表[%s]数据失败: %s", copy.TableName, err.Error())
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}
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}()
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}
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return err
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}
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func (md *MssqlDialect) CopyTableDDL(tableName string, newTableName string) (string, error) {
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if newTableName == "" {
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newTableName = tableName
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}
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metadata := md.dc.GetMetadata()
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// 查询表名和表注释, 设置表注释
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tbs, err := metadata.GetTables(tableName)
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if err != nil || len(tbs) < 1 {
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logx.Errorf("failed to get table, %s", tableName)
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return "", err
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}
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tabInfo := &dbi.Table{
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TableName: newTableName,
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TableComment: tbs[0].TableComment,
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}
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// 查询列信息
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columns, err := metadata.GetColumns(tableName)
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if err != nil {
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logx.Errorf("failed to get columns, %s", tableName)
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return "", err
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}
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sqlGener := md.GetSQLGenerator()
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sqlArr := sqlGener.GenTableDDL(*tabInfo, columns, true)
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// 设置索引
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indexs, err := metadata.GetTableIndex(tableName)
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if err != nil {
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logx.Errorf("failed to get indexs, %s", tableName)
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return strings.Join(sqlArr, ";"), err
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}
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sqlArr = append(sqlArr, sqlGener.GenIndexDDL(*tabInfo, indexs)...)
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return strings.Join(sqlArr, ";"), nil
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}
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func (dx *MssqlDialect) Quoter() dbi.Quoter {
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return mssqlQuoter
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}
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func (md *MssqlDialect) GetDumpHelper() dbi.DumpHelper {
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return new(DumpHelper)
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}
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func (md *MssqlDialect) GetSQLGenerator() dbi.SQLGenerator {
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return &SQLGenerator{dc: md.dc}
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}
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