mirror of
https://gitee.com/dromara/mayfly-go
synced 2025-11-24 10:00:26 +08:00
281 lines
9.2 KiB
Go
281 lines
9.2 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/collx"
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"mayfly-go/pkg/utils/stringx"
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"strings"
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"time"
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_ "gitee.com/chunanyong/dm"
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)
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type DMDialect struct {
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dbi.DefaultDialect
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dc *dbi.DbConn
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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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// 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(tx, tableName, columns, values)
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} else { // 执行MERGE INTO语句
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return dd.batchInsertMerge(tx, tableName, columns, values)
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}
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}
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func (dd *DMDialect) batchInsertSimple(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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identityInsert := fmt.Sprintf("set identity_insert \"%s\" on;", tableName)
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sqlTemp := fmt.Sprintf("%s insert into %s (%s) values %s", identityInsert, dd.QuoteIdentifier(tableName), strings.Join(columns, ","), placeholder)
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effRows := 0
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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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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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return 0, err
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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(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.dc.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 )", dd.QuoteIdentifier(col.ColumnName), dd.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, dd.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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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 ", dd.QuoteIdentifier(col), dd.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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// 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, dd.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, 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 " + dd.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) CopyTable(copy *dbi.DbCopyTable) error {
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tableName := copy.TableName
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metadata := dd.dc.GetMetadata()
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ddl, err := metadata.GetTableDDL(tableName, false)
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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.GetMetaData().GetSqlParserDialect()))
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sqls := strings.Split(ddl, ";")
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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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identityInsert := 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("%s insert into \"%s\" (%s) select %s from \"%s\"", identityInsert, newTableName, columnStr, columnStr, tableName))
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}()
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}
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return err
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}
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func (dd *DMDialect) GenerateTableDDL(columns []dbi.Column, tableInfo dbi.Table, dropBeforeCreate bool) []string {
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tbName := dd.QuoteIdentifier(tableInfo.TableName)
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sqlArr := make([]string, 0)
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if dropBeforeCreate {
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sqlArr = append(sqlArr, fmt.Sprintf("drop table if exists %s", tbName))
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}
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// 组装建表语句
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createSql := fmt.Sprintf("create table %s (", tbName)
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fields := make([]string, 0)
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pks := make([]string, 0)
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columnComments := make([]string, 0)
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for _, column := range columns {
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if column.IsPrimaryKey {
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pks = append(pks, dd.QuoteIdentifier(column.ColumnName))
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}
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fields = append(fields, dd.genColumnBasicSql(column))
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if column.ColumnComment != "" {
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comment := dd.QuoteEscape(column.ColumnComment)
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columnComments = append(columnComments, fmt.Sprintf("comment on column %s.%s is '%s'", tbName, dd.QuoteIdentifier(column.ColumnName), comment))
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}
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}
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createSql += strings.Join(fields, ",\n")
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if len(pks) > 0 {
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createSql += fmt.Sprintf(",\n PRIMARY KEY (%s)", strings.Join(pks, ","))
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}
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createSql += "\n)"
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tableCommentSql := ""
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if tableInfo.TableComment != "" {
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comment := dd.QuoteEscape(tableInfo.TableComment)
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tableCommentSql = fmt.Sprintf("comment on table %s is '%s'", tbName, comment)
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}
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sqlArr = append(sqlArr, createSql)
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if tableCommentSql != "" {
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sqlArr = append(sqlArr, tableCommentSql)
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}
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if len(columnComments) > 0 {
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sqlArr = append(sqlArr, columnComments...)
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}
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return sqlArr
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}
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func (dd *DMDialect) GenerateIndexDDL(indexs []dbi.Index, tableInfo dbi.Table) []string {
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sqls := make([]string, 0)
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for _, index := range indexs {
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unique := ""
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if index.IsUnique {
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unique = "unique"
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}
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// 取出列名，添加引号
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cols := strings.Split(index.ColumnName, ",")
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colNames := make([]string, len(cols))
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for i, name := range cols {
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colNames[i] = dd.QuoteIdentifier(name)
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}
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sqls = append(sqls, fmt.Sprintf("create %s index %s on %s(%s)", unique, dd.QuoteIdentifier(index.IndexName), dd.QuoteIdentifier(tableInfo.TableName), strings.Join(colNames, ",")))
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}
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return sqls
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}
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func (dd *DMDialect) GetDataHelper() dbi.DataHelper {
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return dataHelper
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}
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func (dd *DMDialect) GetColumnHelper() dbi.ColumnHelper {
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return columnHelper
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}
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func (dd *DMDialect) GetDumpHelper() dbi.DumpHelper {
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return new(DumpHelper)
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}
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func (dd *DMDialect) genColumnBasicSql(column dbi.Column) string {
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colName := dd.QuoteIdentifier(column.ColumnName)
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dataType := string(column.DataType)
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incr := ""
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if column.IsIdentity {
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incr = " IDENTITY"
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}
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nullAble := ""
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if !column.Nullable {
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nullAble = " NOT NULL"
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}
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defVal := "" // 默认值需要判断引号，如函数是不需要引号的 // 为了防止跨源函数不支持 当默认值是函数时，不需要设置默认值
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if column.ColumnDefault != "" && !strings.Contains(column.ColumnDefault, "(") {
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// 哪些字段类型默认值需要加引号
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mark := false
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if collx.ArrayAnyMatches([]string{"char", "text", "date", "time", "lob"}, strings.ToLower(dataType)) {
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// 当数据类型是日期时间，默认值是日期时间函数时，默认值不需要引号
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if collx.ArrayAnyMatches([]string{"date", "time"}, strings.ToLower(dataType)) &&
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collx.ArrayAnyMatches([]string{"DATE", "TIME"}, strings.ToUpper(column.ColumnDefault)) {
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mark = false
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} else {
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mark = true
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}
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}
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if mark {
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defVal = fmt.Sprintf(" DEFAULT '%s'", column.ColumnDefault)
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} else {
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defVal = fmt.Sprintf(" DEFAULT %s", column.ColumnDefault)
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}
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}
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columnSql := fmt.Sprintf(" %s %s%s%s%s", colName, column.GetColumnType(), incr, nullAble, defVal)
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return columnSql
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}
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