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https://gitee.com/dromara/mayfly-go
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98 lines
2.7 KiB
Go
98 lines
2.7 KiB
Go
package mysql
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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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"strings"
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"time"
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)
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type MysqlDialect struct {
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dbi.DefaultDialect
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dc *dbi.DbConn
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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 (md *MysqlDialect) GetDbProgram() (dbi.DbProgram, error) {
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return NewDbProgramMysql(md.dc), nil
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}
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func (md *MysqlDialect) BatchInsert(tx *sql.Tx, tableName string, columns []string, values [][]any, duplicateStrategy int) (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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// 执行批量insert sql，mysql支持批量insert语法
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// insert into table_name (column1, column2, ...) values (value1, value2, ...), (value1, value2, ...), ...
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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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prefix := "insert into"
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if duplicateStrategy == 1 {
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prefix = "insert ignore into"
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} else if duplicateStrategy == 2 {
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prefix = "replace into"
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}
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sqlStr := fmt.Sprintf("%s %s (%s) values %s", prefix, md.dc.GetMetaData().QuoteIdentifier(tableName), strings.Join(columns, ","), placeholder)
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// 执行批量insert sql
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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 md.dc.TxExec(tx, sqlStr, args...)
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}
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func (md *MysqlDialect) CopyTable(copy *dbi.DbCopyTable) error {
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tableName := copy.TableName
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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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// 复制表结构创建表
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_, err := md.dc.Exec(fmt.Sprintf("create table %s like %s", newTableName, tableName))
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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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_, _ = md.dc.Exec(fmt.Sprintf("insert into %s select * from %s", newTableName, tableName))
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}()
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}
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return err
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}
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func (md *MysqlDialect) CreateTable(columns []dbi.Column, tableInfo dbi.Table, dropOldTable bool) (int, error) {
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sqlArr := md.dc.GetMetaData().GenerateTableDDL(columns, tableInfo, dropOldTable)
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for _, sqlStr := range sqlArr {
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_, err := md.dc.Exec(sqlStr)
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if err != nil {
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return 0, err
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}
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}
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return len(sqlArr), nil
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}
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func (md *MysqlDialect) CreateIndex(tableInfo dbi.Table, indexs []dbi.Index) error {
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meta := md.dc.GetMetaData()
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sqlArr := meta.GenerateIndexDDL(indexs, tableInfo)
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for _, sqlStr := range sqlArr {
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_, err := md.dc.Exec(sqlStr)
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if err != nil {
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return err
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}
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}
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return nil
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}
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