mirror of
https://gitee.com/dromara/mayfly-go
synced 2025-11-03 16:00:25 +08:00
353 lines
9.6 KiB
Go
353 lines
9.6 KiB
Go
package dbm
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import (
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"context"
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"database/sql"
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"fmt"
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"io"
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machineapp "mayfly-go/internal/machine/application"
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"mayfly-go/pkg/errorx"
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"mayfly-go/pkg/logx"
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"mayfly-go/pkg/utils/anyx"
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"net"
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"strings"
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_ "gitee.com/chunanyong/dm"
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)
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type ConnectionInfo struct {
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Port int
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Listener net.Listener
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remoteConn net.Conn
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}
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var connectionMap = make(map[string]ConnectionInfo)
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func getLocalListener() (net.Listener, int, error) {
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// Setup localListener (type net.Listener)
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localListener, err := net.Listen("tcp", "localhost:0")
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if err != nil {
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return nil, 0, err
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}
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// 获取本地端口
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localPort := localListener.Addr().(*net.TCPAddr).Port
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return localListener, localPort, nil
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}
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func acceptConn(listener net.Listener, sshConn net.Conn) {
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for {
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localConn, err := listener.Accept()
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if err != nil {
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logx.Warn("端口转发出错", err)
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return
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}
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go forward(localConn, sshConn)
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}
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}
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func forward(localConn net.Conn, remoteConn net.Conn) {
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copyConn := func(writer, reader net.Conn) {
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_, err := io.Copy(writer, reader)
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if err != nil {
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logx.Warnf("io.Copy error: %s", err)
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}
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}
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go copyConn(localConn, remoteConn)
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go copyConn(remoteConn, localConn)
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}
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func openSsh(d *DbInfo) error {
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sshTunnelMachine, err := machineapp.GetMachineApp().GetSshTunnelMachine(d.SshTunnelMachineId)
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if err != nil {
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return err
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}
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remoteConn, err := sshTunnelMachine.GetDialConn("tcp", fmt.Sprintf("%s:%d", d.Host, d.Port))
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if err != nil {
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return err
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}
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// 获取sshConn的本地端口
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localLister, localPort, err := getLocalListener()
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// defer localLister.Close()
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go acceptConn(localLister, remoteConn)
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connectionMap[d.Network] = ConnectionInfo{
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Port: localPort,
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Listener: localLister,
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remoteConn: remoteConn,
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}
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d.Host = "127.0.0.1"
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d.Port = localPort
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return nil
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}
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// 创建一个成员变量存放ssh隧道转发对应的本地连接
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func getDmDB(d *DbInfo) (*sql.DB, error) {
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driverName := "dm"
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// SSH Conect 暂时不支持隧道连接
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db := d.Database
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var dbParam string
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if db != "" {
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// postgres database可以使用db/schema表示，方便连接指定schema, 若不存在schema则使用默认schema
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ss := strings.Split(db, "/")
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if len(ss) > 1 {
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dbParam = fmt.Sprintf("%s?schema=%s", ss[0], ss[len(ss)-1])
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} else {
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dbParam = db
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}
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}
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// 开启ssh隧道
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if d.SshTunnelMachineId > 0 {
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err := openSsh(d)
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if err != nil {
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return nil, err
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}
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}
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dsn := fmt.Sprintf("dm://%s:%s@%s:%d/%s", d.Username, d.Password, d.Host, d.Port, dbParam)
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return sql.Open(driverName, dsn)
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}
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// ---------------------------------- DM元数据 -----------------------------------
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const (
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DM_META_FILE = "metasql/dm_meta.sql"
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DM_DB_SCHEMAS = "DM_DB_SCHEMAS"
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DM_TABLE_INFO_KEY = "DM_TABLE_INFO"
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DM_INDEX_INFO_KEY = "DM_INDEX_INFO"
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DM_COLUMN_MA_KEY = "DM_COLUMN_MA"
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)
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type DMDialect struct {
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dc *DbConn
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}
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func (dd *DMDialect) GetDbServer() (*DbServer, error) {
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_, res, err := dd.dc.Query("select * from v$instance")
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if err != nil {
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return nil, err
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}
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ds := &DbServer{
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Version: anyx.ConvString(res[0]["SVR_VERSION"]),
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}
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return ds, nil
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}
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func (pd *DMDialect) GetDbNames() ([]string, error) {
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_, res, err := pd.dc.Query("SELECT name AS DBNAME FROM v$database")
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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 (pd *DMDialect) GetTables() ([]Table, error) {
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// 首先执行更新统计信息sql 这个统计信息在数据量比较大的时候就比较耗时，所以最好定时执行
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// _, _, err := pd.dc.Query("dbms_stats.GATHER_SCHEMA_stats(SELECT SF_GET_SCHEMA_NAME_BY_ID(CURRENT_SCHID))")
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// 查询表信息
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_, res, err := pd.dc.Query(GetLocalSql(DM_META_FILE, DM_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([]Table, 0)
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for _, re := range res {
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tables = append(tables, Table{
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TableName: re["TABLE_NAME"].(string),
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TableComment: anyx.ConvString(re["TABLE_COMMENT"]),
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CreateTime: anyx.ConvString(re["CREATE_TIME"]),
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TableRows: anyx.ConvInt(re["TABLE_ROWS"]),
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DataLength: anyx.ConvInt64(re["DATA_LENGTH"]),
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IndexLength: anyx.ConvInt64(re["INDEX_LENGTH"]),
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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 (pd *DMDialect) GetColumns(tableNames ...string) ([]Column, error) {
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tableName := ""
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for i := 0; i < len(tableNames); i++ {
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if i != 0 {
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tableName = tableName + ", "
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}
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tableName = tableName + "'" + tableNames[i] + "'"
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}
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_, res, err := pd.dc.Query(fmt.Sprintf(GetLocalSql(DM_META_FILE, DM_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([]Column, 0)
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for _, re := range res {
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columns = append(columns, Column{
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TableName: re["TABLE_NAME"].(string),
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ColumnName: re["COLUMN_NAME"].(string),
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ColumnType: anyx.ConvString(re["COLUMN_TYPE"]),
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ColumnComment: anyx.ConvString(re["COLUMN_COMMENT"]),
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Nullable: anyx.ConvString(re["NULLABLE"]),
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ColumnKey: anyx.ConvString(re["COLUMN_KEY"]),
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ColumnDefault: anyx.ConvString(re["COLUMN_DEFAULT"]),
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NumScale: anyx.ConvString(re["NUM_SCALE"]),
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})
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}
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return columns, nil
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}
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func (pd *DMDialect) GetPrimaryKey(tablename string) (string, error) {
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columns, err := pd.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.ColumnKey == "PRI" {
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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 (pd *DMDialect) GetTableIndex(tableName string) ([]Index, error) {
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_, res, err := pd.dc.Query(fmt.Sprintf(GetLocalSql(DM_META_FILE, DM_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([]Index, 0)
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for _, re := range res {
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indexs = append(indexs, Index{
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IndexName: re["INDEX_NAME"].(string),
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ColumnName: anyx.ConvString(re["COLUMN_NAME"]),
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IndexType: anyx.ConvString(re["INDEX_TYPE"]),
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IndexComment: anyx.ConvString(re["INDEX_COMMENT"]),
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NonUnique: anyx.ConvInt(re["NON_UNIQUE"]),
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SeqInIndex: anyx.ConvInt(re["SEQ_IN_INDEX"]),
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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([]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 (pd *DMDialect) GetTableDDL(tableName string) (string, error) {
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ddlSql := fmt.Sprintf("CALL SP_TABLEDEF((SELECT SF_GET_SCHEMA_NAME_BY_ID(CURRENT_SCHID)), '%s')", tableName)
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_, res, err := pd.dc.Query(ddlSql)
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if err != nil {
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return "", err
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}
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// 建表ddl
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var builder strings.Builder
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for _, re := range res {
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builder.WriteString(re["COLUMN_VALUE"].(string))
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}
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// 表注释
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_, res, err = pd.dc.Query(fmt.Sprintf(`
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select OWNER, COMMENTS from DBA_TAB_COMMENTS where TABLE_TYPE='TABLE' and TABLE_NAME = '%s'
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and owner = (SELECT SF_GET_SCHEMA_NAME_BY_ID(CURRENT_SCHID))
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`, 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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// COMMENT ON TABLE "SYS_MENU" IS '菜单表';
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if re["COMMENTS"] != nil {
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tableComment := fmt.Sprintf("\n\nCOMMENT ON TABLE \"%s\".\"%s\" IS '%s';", re["OWNER"].(string), tableName, re["COMMENTS"].(string))
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builder.WriteString(tableComment)
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}
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}
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// 字段注释
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fieldSql := fmt.Sprintf(`
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SELECT OWNER, COLUMN_NAME, COMMENTS
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FROM USER_COL_COMMENTS
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WHERE OWNER = (SELECT SF_GET_SCHEMA_NAME_BY_ID(CURRENT_SCHID))
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AND TABLE_NAME = '%s'
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`, tableName)
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_, res, err = pd.dc.Query(fieldSql)
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if err != nil {
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return "", err
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}
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builder.WriteString("\n")
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for _, re := range res {
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// COMMENT ON COLUMN "SYS_MENU"."BIZ_CODE" IS '业务编码，应用编码1';
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if re["COMMENTS"] != nil {
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fieldComment := fmt.Sprintf("\nCOMMENT ON COLUMN \"%s\".\"%s\".\"%s\" IS '%s';", re["OWNER"].(string), tableName, re["COLUMN_NAME"].(string), re["COMMENTS"].(string))
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builder.WriteString(fieldComment)
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}
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}
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// 索引信息
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indexSql := fmt.Sprintf(`
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select indexdef(b.object_id,1) as INDEX_DEF from DBA_INDEXES a
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join dba_objects b on a.owner = b.owner and b.object_name = a.index_name and b.object_type = 'INDEX'
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where a.owner = (SELECT SF_GET_SCHEMA_NAME_BY_ID(CURRENT_SCHID))
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and a.table_name = '%s'
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and indexdef(b.object_id,1) != '禁止查看系统定义的索引信息'
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`, tableName)
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_, res, err = pd.dc.Query(indexSql)
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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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builder.WriteString("\n\n" + re["INDEX_DEF"].(string))
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}
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return builder.String(), nil
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}
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func (pd *DMDialect) GetTableRecord(tableName string, pageNum, pageSize int) ([]*QueryColumn, []map[string]any, error) {
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return pd.dc.Query(fmt.Sprintf("SELECT * FROM %s OFFSET %d LIMIT %d", tableName, (pageNum-1)*pageSize, pageSize))
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}
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func (pd *DMDialect) WalkTableRecord(tableName string, walk func(record map[string]any, columns []*QueryColumn)) error {
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return pd.dc.WalkTableRecord(context.Background(), fmt.Sprintf("SELECT * FROM %s", tableName), walk)
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}
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// 获取DM当前连接的库可访问的schemaNames
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func (pd *DMDialect) GetSchemas() ([]string, error) {
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sql := GetLocalSql(DM_META_FILE, DM_DB_SCHEMAS)
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_, res, err := pd.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["SCHEMA_NAME"]))
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}
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return schemaNames, nil
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}
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