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https://gitee.com/dromara/mayfly-go
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refactor: code review
This commit is contained in:
meilin.huang
265
server/internal/db/dbm/dialect_pgsql.go
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265
server/internal/db/dbm/dialect_pgsql.go
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package dbm
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import (
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"database/sql"
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"database/sql/driver"
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"fmt"
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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/utils/anyx"
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"mayfly-go/pkg/utils/collx"
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"net"
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"strings"
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"time"
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"github.com/lib/pq"
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)
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func getPgsqlDB(d *DbInfo) (*sql.DB, error) {
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driverName := string(d.Type)
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// SSH Conect
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if d.SshTunnelMachineId > 0 {
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// 如果使用了隧道，则使用`postgres:ssh:隧道机器id`注册名
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driverName = fmt.Sprintf("postgres:ssh:%d", d.SshTunnelMachineId)
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if !collx.ArrayContains(sql.Drivers(), driverName) {
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sql.Register(driverName, &PqSqlDialer{sshTunnelMachineId: d.SshTunnelMachineId})
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}
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sql.Drivers()
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}
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db := d.Database
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var dbParam string
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exsitSchema := false
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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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exsitSchema = true
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dbParam = fmt.Sprintf("dbname=%s search_path=%s", ss[0], ss[len(ss)-1])
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} else {
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dbParam = "dbname=" + db
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}
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}
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dsn := fmt.Sprintf("host=%s port=%d user=%s password=%s %s sslmode=disable", d.Host, d.Port, d.Username, d.Password, dbParam)
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// 存在额外指定参数，则拼接该连接参数
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if d.Params != "" {
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// 存在指定的db，则需要将dbInstance配置中的parmas排除掉dbname和search_path
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if db != "" {
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paramArr := strings.Split(d.Params, "&")
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paramArr = collx.ArrayRemoveFunc(paramArr, func(param string) bool {
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if strings.HasPrefix(param, "dbname=") {
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return true
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}
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if exsitSchema && strings.HasPrefix(param, "search_path") {
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return true
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}
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return false
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})
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d.Params = strings.Join(paramArr, " ")
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}
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dsn = fmt.Sprintf("%s %s", dsn, strings.Join(strings.Split(d.Params, "&"), " "))
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}
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return sql.Open(driverName, dsn)
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}
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// pgsql dialer
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type PqSqlDialer struct {
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sshTunnelMachineId int
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}
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func (d *PqSqlDialer) Open(name string) (driver.Conn, error) {
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return pq.DialOpen(d, name)
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}
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func (pd *PqSqlDialer) Dial(network, address string) (net.Conn, error) {
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sshTunnel, err := machineapp.GetMachineApp().GetSshTunnelMachine(pd.sshTunnelMachineId)
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if err != nil {
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return nil, err
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}
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if sshConn, err := sshTunnel.GetDialConn("tcp", address); err == nil {
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return sshConn, nil
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} else {
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return nil, err
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}
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}
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func (pd *PqSqlDialer) DialTimeout(network, address string, timeout time.Duration) (net.Conn, error) {
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return pd.Dial(network, address)
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}
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// ---------------------------------- pgsql元数据 -----------------------------------
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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 *DbConn
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}
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func (pd *PgsqlDialect) GetDbNames() ([]string, error) {
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_, res, err := pd.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 (pd *PgsqlDialect) GetTables() ([]Table, error) {
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_, res, err := pd.dc.Query(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([]Table, 0)
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for _, re := range res {
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tables = append(tables, 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 (pd *PgsqlDialect) 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(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([]Column, 0)
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for _, re := range res {
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columns = append(columns, Column{
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TableName: re["tableName"].(string),
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ColumnName: re["columnName"].(string),
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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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ColumnKey: anyx.ConvString(re["columnKey"]),
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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 (pd *PgsqlDialect) 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 *PgsqlDialect) GetTableIndex(tableName string) ([]Index, error) {
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_, res, err := pd.dc.Query(fmt.Sprintf(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([]Index, 0)
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for _, re := range res {
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indexs = append(indexs, Index{
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IndexName: re["indexName"].(string),
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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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NonUnique: anyx.ConvInt(re["nonUnique"]),
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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([]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 *PgsqlDialect) GetCreateTableDdl(tableName string) (string, error) {
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_, err := pd.dc.Exec(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, _ := pd.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 := 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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return res[0]["sql"].(string), nil
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}
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func (pd *PgsqlDialect) GetTableRecord(tableName string, pageNum, pageSize int) ([]string, []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 *PgsqlDialect) WalkTableRecord(tableName string, walk func(record map[string]any, columns []string)) error {
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return pd.dc.WalkTableRecord(fmt.Sprintf("SELECT * FROM %s", tableName), walk)
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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 (pd *PgsqlDialect) GetSchemas() ([]string, error) {
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sql := GetLocalSql(PGSQL_META_FILE, PGSQL_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["schemaName"]))
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}
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return schemaNames, nil
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}
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