mirror of
https://gitee.com/dromara/mayfly-go
synced 2025-11-04 16:30:25 +08:00
f2b6e15cf4
* feat: 优化数据库 BINLOG 同步机制 * feat: 删除数据库实例前需删除关联的数据库备份与恢复任务 * refactor: 重构数据库备份与恢复模块 * feat: 定时清理数据库备份历史和本地 Binlog 文件 * feat: 压缩数据库备份文件
339 lines
10 KiB
Go
339 lines
10 KiB
Go
package postgres
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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/errorx"
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"mayfly-go/pkg/utils/anyx"
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"mayfly-go/pkg/utils/collx"
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"regexp"
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"strings"
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"time"
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)
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const (
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PGSQL_META_FILE = "metasql/pgsql_meta.sql"
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PGSQL_DB_SCHEMAS = "PGSQL_DB_SCHEMAS"
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PGSQL_TABLE_INFO_KEY = "PGSQL_TABLE_INFO"
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PGSQL_INDEX_INFO_KEY = "PGSQL_INDEX_INFO"
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PGSQL_COLUMN_MA_KEY = "PGSQL_COLUMN_MA"
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PGSQL_TABLE_DDL_KEY = "PGSQL_TABLE_DDL_FUNC"
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)
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type PgsqlDialect struct {
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dc *dbi.DbConn
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}
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func (md *PgsqlDialect) GetDbServer() (*dbi.DbServer, error) {
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_, res, err := md.dc.Query("SHOW server_version")
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if err != nil {
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return nil, err
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}
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ds := &dbi.DbServer{
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Version: anyx.ConvString(res[0]["server_version"]),
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}
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return ds, nil
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}
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func (md *PgsqlDialect) GetDbNames() ([]string, error) {
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_, res, err := md.dc.Query("SELECT datname AS dbname FROM pg_database WHERE datistemplate = false AND has_database_privilege(datname, 'CONNECT')")
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if err != nil {
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return nil, err
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}
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databases := make([]string, 0)
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for _, re := range res {
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databases = append(databases, anyx.ConvString(re["dbname"]))
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}
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return databases, nil
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}
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// 获取表基础元信息, 如表名等
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func (md *PgsqlDialect) GetTables() ([]dbi.Table, error) {
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_, res, err := md.dc.Query(dbi.GetLocalSql(PGSQL_META_FILE, PGSQL_TABLE_INFO_KEY))
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if err != nil {
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return nil, err
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}
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tables := make([]dbi.Table, 0)
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for _, re := range res {
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tables = append(tables, dbi.Table{
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TableName: re["tableName"].(string),
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TableComment: anyx.ConvString(re["tableComment"]),
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CreateTime: anyx.ConvString(re["createTime"]),
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TableRows: anyx.ConvInt(re["tableRows"]),
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DataLength: anyx.ConvInt64(re["dataLength"]),
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IndexLength: anyx.ConvInt64(re["indexLength"]),
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})
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}
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return tables, nil
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}
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// 获取列元信息, 如列名等
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func (md *PgsqlDialect) GetColumns(tableNames ...string) ([]dbi.Column, error) {
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dbType := md.dc.Info.Type
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tableName := strings.Join(collx.ArrayMap[string, string](tableNames, func(val string) string {
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return fmt.Sprintf("'%s'", dbType.RemoveQuote(val))
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}), ",")
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_, res, err := md.dc.Query(fmt.Sprintf(dbi.GetLocalSql(PGSQL_META_FILE, PGSQL_COLUMN_MA_KEY), tableName))
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if err != nil {
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return nil, err
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}
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columns := make([]dbi.Column, 0)
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for _, re := range res {
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columns = append(columns, dbi.Column{
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TableName: anyx.ConvString(re["tableName"]),
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ColumnName: anyx.ConvString(re["columnName"]),
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ColumnType: anyx.ConvString(re["columnType"]),
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ColumnComment: anyx.ConvString(re["columnComment"]),
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Nullable: anyx.ConvString(re["nullable"]),
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IsPrimaryKey: anyx.ConvInt(re["isPrimaryKey"]) == 1,
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IsIdentity: anyx.ConvInt(re["isIdentity"]) == 1,
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ColumnDefault: anyx.ConvString(re["columnDefault"]),
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NumScale: anyx.ConvString(re["numScale"]),
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})
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}
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return columns, nil
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}
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func (md *PgsqlDialect) GetPrimaryKey(tablename string) (string, error) {
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columns, err := md.GetColumns(tablename)
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if err != nil {
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return "", err
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}
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if len(columns) == 0 {
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return "", errorx.NewBiz("[%s] 表不存在", tablename)
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}
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for _, v := range columns {
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if v.IsPrimaryKey {
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return v.ColumnName, nil
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}
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}
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return columns[0].ColumnName, nil
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}
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// 获取表索引信息
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func (md *PgsqlDialect) GetTableIndex(tableName string) ([]dbi.Index, error) {
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_, res, err := md.dc.Query(fmt.Sprintf(dbi.GetLocalSql(PGSQL_META_FILE, PGSQL_INDEX_INFO_KEY), tableName))
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if err != nil {
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return nil, err
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}
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indexs := make([]dbi.Index, 0)
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for _, re := range res {
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indexs = append(indexs, dbi.Index{
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IndexName: anyx.ConvString(re["indexName"]),
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ColumnName: anyx.ConvString(re["columnName"]),
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IndexType: anyx.ConvString(re["IndexType"]),
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IndexComment: anyx.ConvString(re["indexComment"]),
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IsUnique: anyx.ConvInt(re["isUnique"]) == 1,
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SeqInIndex: anyx.ConvInt(re["seqInIndex"]),
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})
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}
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// 把查询结果以索引名分组，索引字段以逗号连接
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result := make([]dbi.Index, 0)
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key := ""
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for _, v := range indexs {
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// 当前的索引名
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in := v.IndexName
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if key == in {
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// 索引字段已根据名称和顺序排序，故取最后一个即可
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i := len(result) - 1
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// 同索引字段以逗号连接
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result[i].ColumnName = result[i].ColumnName + "," + v.ColumnName
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} else {
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key = in
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result = append(result, v)
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}
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}
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return result, nil
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}
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// 获取建表ddl
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func (md *PgsqlDialect) GetTableDDL(tableName string) (string, error) {
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_, err := md.dc.Exec(dbi.GetLocalSql(PGSQL_META_FILE, PGSQL_TABLE_DDL_KEY))
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if err != nil {
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return "", err
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}
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_, schemaRes, _ := md.dc.Query("select current_schema() as schema")
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schemaName := schemaRes[0]["schema"].(string)
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ddlSql := fmt.Sprintf("select showcreatetable('%s','%s') as sql", schemaName, tableName)
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_, res, err := md.dc.Query(ddlSql)
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if err != nil {
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return "", err
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}
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return res[0]["sql"].(string), nil
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}
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// 获取pgsql当前连接的库可访问的schemaNames
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func (md *PgsqlDialect) GetSchemas() ([]string, error) {
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sql := dbi.GetLocalSql(PGSQL_META_FILE, PGSQL_DB_SCHEMAS)
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_, res, err := md.dc.Query(sql)
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if err != nil {
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return nil, err
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}
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schemaNames := make([]string, 0)
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for _, re := range res {
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schemaNames = append(schemaNames, anyx.ConvString(re["schemaName"]))
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}
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return schemaNames, nil
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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 *PgsqlDialect) 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", md.dc.Info.Type)
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}
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func (md *PgsqlDialect) BatchInsert(tx *sql.Tx, tableName string, columns []string, values [][]any) (int64, error) {
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// 执行批量insert sql，跟mysql一样 pg或高斯支持批量insert语法
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// insert into table_name (column1, column2, ...) values (value1, value2, ...), (value1, value2, ...), ...
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// 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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// 构建占位符字符串 "($1, $2, $3), ($4, $5, $6), ..." 用于指定参数
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var placeholders []string
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for i := 0; i < len(args); i += len(columns) {
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var placeholder []string
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for j := 0; j < len(columns); j++ {
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placeholder = append(placeholder, fmt.Sprintf("$%d", i+j+1))
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}
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placeholders = append(placeholders, "("+strings.Join(placeholder, ", ")+")")
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}
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sqlStr := fmt.Sprintf("insert into %s (%s) values %s", md.dc.Info.Type.QuoteIdentifier(tableName), strings.Join(columns, ","), strings.Join(placeholders, ", "))
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// 执行批量insert sql
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return md.dc.TxExec(tx, sqlStr, args...)
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}
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func (md *PgsqlDialect) GetDataConverter() dbi.DataConverter {
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return new(DataConverter)
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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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)
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type DataConverter struct {
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}
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func (dc *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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// 日期时间类型
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if datetimeRegexp.MatchString(dbColumnType) {
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return dbi.DataTypeDateTime
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}
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// 日期类型
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if dateRegexp.MatchString(dbColumnType) {
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return dbi.DataTypeDate
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}
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// 时间类型
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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 (dc *DataConverter) FormatData(dbColumnValue any, dataType dbi.DataType) string {
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str := fmt.Sprintf("%v", dbColumnValue)
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switch dataType {
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case dbi.DataTypeDateTime: // "2024-01-02T22:16:28.545377+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: // "2024-01-02T00:00:00Z"
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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: // "0000-01-01T22:16:28.545075+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 anyx.ConvString(dbColumnValue)
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}
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func (dc *DataConverter) ParseData(dbColumnValue any, dataType dbi.DataType) any {
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return dbColumnValue
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}
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func (md *PgsqlDialect) IsGauss() bool {
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return strings.Contains(md.dc.Info.Params, "gauss")
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}
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func (md *PgsqlDialect) 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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// 执行根据旧表创建新表
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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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// 查询旧表的自增字段名 重新设置新表的序列序列器
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_, res, err := md.dc.Query(fmt.Sprintf("select column_name from information_schema.columns where table_name = '%s' and column_default like 'nextval%%'", tableName))
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if err != nil {
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return err
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}
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for _, re := range res {
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colName := anyx.ConvString(re["column_name"])
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if colName != "" {
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// 查询自增列当前最大值
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_, maxRes, err := md.dc.Query(fmt.Sprintf("select max(%s) max_val from %s", colName, tableName))
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if err != nil {
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return err
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}
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maxVal := anyx.ConvInt(maxRes[0]["max_val"])
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// 序列起始值为1或当前最大值+1
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if maxVal <= 0 {
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maxVal = 1
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} else {
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maxVal += 1
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}
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// 之所以不用tableName_colName_seq是因为gauss会自动创建同名的序列，且无法修改序列起始值，所以直接使用新序列值
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newSeqName := fmt.Sprintf("%s_%s_copy_seq", newTableName, colName)
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// 创建自增序列，当前最大值为旧表最大值
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_, err = md.dc.Exec(fmt.Sprintf("CREATE SEQUENCE %s START %d INCREMENT 1", newSeqName, maxVal))
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if err != nil {
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return err
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}
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// 将新表的自增主键序列与主键列相关联
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_, err = md.dc.Exec(fmt.Sprintf("alter table %s alter column %s set default nextval('%s')", newTableName, colName, newSeqName))
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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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}
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return err
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}
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