mirror of
https://github.com/Syngnat/GoNavi.git
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✨ feat(datasource): 新增 MariaDB、Vastbase、HighGo、MongoDB、SQL Server 五种数据源支持
- MariaDB:MySQL驱动占位,默认端口3306,归类关系型数据库 - Vastbase(海量):PG驱动占位,默认端口5432,归类国产数据库 - HighGo(瀚高):PG驱动,支持SM3认证扩展,归类国产数据库 - MongoDB:官方驱动实现,归类NoSQL - SQL Server:微软官方驱动实现,归类关系型数据库 - ConnectionModal 新增数据源选项卡与默认端口配置 - database.go 新增5种类型的实例化分支 - 同步更新 db_context、methods_db、sql_sanitize、methods_file、sql_helpers 类型判断 - 新增 HighGo SM3 驱动集成指南
This commit is contained in:
635
internal/db/sqlserver_impl.go
Normal file
635
internal/db/sqlserver_impl.go
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@@ -0,0 +1,635 @@
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package db
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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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"net"
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"net/url"
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"strconv"
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"strings"
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"time"
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"GoNavi-Wails/internal/connection"
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"GoNavi-Wails/internal/logger"
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"GoNavi-Wails/internal/ssh"
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"GoNavi-Wails/internal/utils"
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_ "github.com/microsoft/go-mssqldb"
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)
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type SqlServerDB struct {
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conn *sql.DB
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pingTimeout time.Duration
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forwarder *ssh.LocalForwarder
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}
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// quoteBracket escapes ] in identifiers for safe use in SQL Server [bracket] notation
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func quoteBracket(name string) string {
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return strings.ReplaceAll(name, "]", "]]")
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}
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func (s *SqlServerDB) getDSN(config connection.ConnectionConfig) string {
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// sqlserver://user:password@host:port?database=dbname
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dbname := config.Database
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if dbname == "" {
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dbname = "master"
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}
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u := &url.URL{
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Scheme: "sqlserver",
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Host: net.JoinHostPort(config.Host, strconv.Itoa(config.Port)),
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}
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u.User = url.UserPassword(config.User, config.Password)
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q := url.Values{}
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q.Set("database", dbname)
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q.Set("connection timeout", strconv.Itoa(getConnectTimeoutSeconds(config)))
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q.Set("encrypt", "disable")
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q.Set("TrustServerCertificate", "true")
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u.RawQuery = q.Encode()
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return u.String()
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}
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func (s *SqlServerDB) Connect(config connection.ConnectionConfig) error {
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var dsn string
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if config.UseSSH {
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logger.Infof("SQL Server 使用 SSH 连接:地址=%s:%d 用户=%s", config.Host, config.Port, config.User)
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forwarder, err := ssh.GetOrCreateLocalForwarder(config.SSH, config.Host, config.Port)
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if err != nil {
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return fmt.Errorf("创建 SSH 隧道失败:%w", err)
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}
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s.forwarder = forwarder
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host, portStr, err := net.SplitHostPort(forwarder.LocalAddr)
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if err != nil {
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return fmt.Errorf("解析本地转发地址失败:%w", err)
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}
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port, err := strconv.Atoi(portStr)
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if err != nil {
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return fmt.Errorf("解析本地端口失败:%w", err)
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}
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localConfig := config
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localConfig.Host = host
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localConfig.Port = port
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localConfig.UseSSH = false
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dsn = s.getDSN(localConfig)
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logger.Infof("SQL Server 通过本地端口转发连接:%s -> %s:%d", forwarder.LocalAddr, config.Host, config.Port)
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} else {
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dsn = s.getDSN(config)
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}
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db, err := sql.Open("sqlserver", dsn)
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if err != nil {
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return fmt.Errorf("打开数据库连接失败:%w", err)
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}
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s.conn = db
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s.pingTimeout = getConnectTimeout(config)
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if err := s.Ping(); err != nil {
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return fmt.Errorf("连接建立后验证失败:%w", err)
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}
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return nil
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}
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func (s *SqlServerDB) Close() error {
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if s.forwarder != nil {
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if err := s.forwarder.Close(); err != nil {
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logger.Warnf("关闭 SQL Server SSH 端口转发失败:%v", err)
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}
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s.forwarder = nil
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}
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if s.conn != nil {
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return s.conn.Close()
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}
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return nil
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}
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func (s *SqlServerDB) Ping() error {
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if s.conn == nil {
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return fmt.Errorf("connection not open")
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}
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timeout := s.pingTimeout
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if timeout <= 0 {
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timeout = 5 * time.Second
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}
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ctx, cancel := utils.ContextWithTimeout(timeout)
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defer cancel()
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return s.conn.PingContext(ctx)
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}
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func (s *SqlServerDB) QueryContext(ctx context.Context, query string) ([]map[string]interface{}, []string, error) {
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if s.conn == nil {
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return nil, nil, fmt.Errorf("connection not open")
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}
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rows, err := s.conn.QueryContext(ctx, query)
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if err != nil {
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return nil, nil, err
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}
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defer rows.Close()
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return scanRows(rows)
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}
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func (s *SqlServerDB) Query(query string) ([]map[string]interface{}, []string, error) {
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if s.conn == nil {
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return nil, nil, fmt.Errorf("connection not open")
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}
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rows, err := s.conn.Query(query)
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if err != nil {
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return nil, nil, err
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}
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defer rows.Close()
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return scanRows(rows)
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}
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func (s *SqlServerDB) ExecContext(ctx context.Context, query string) (int64, error) {
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if s.conn == nil {
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return 0, fmt.Errorf("connection not open")
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}
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res, err := s.conn.ExecContext(ctx, query)
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if err != nil {
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return 0, err
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}
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return res.RowsAffected()
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}
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func (s *SqlServerDB) Exec(query string) (int64, error) {
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if s.conn == nil {
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return 0, fmt.Errorf("connection not open")
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}
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res, err := s.conn.Exec(query)
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if err != nil {
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return 0, err
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}
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return res.RowsAffected()
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}
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func (s *SqlServerDB) GetDatabases() ([]string, error) {
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query := "SELECT name FROM sys.databases WHERE state_desc = 'ONLINE' ORDER BY name"
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data, _, err := s.Query(query)
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if err != nil {
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return nil, err
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}
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var dbs []string
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for _, row := range data {
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if val, ok := row["name"]; ok {
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dbs = append(dbs, fmt.Sprintf("%v", val))
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}
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}
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return dbs, nil
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}
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func (s *SqlServerDB) GetTables(dbName string) ([]string, error) {
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// SQL Server uses schema.table format, default schema is dbo
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safeDB := quoteBracket(dbName)
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query := fmt.Sprintf(`
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SELECT s.name AS schema_name, t.name AS table_name
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FROM [%s].sys.tables t
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JOIN [%s].sys.schemas s ON t.schema_id = s.schema_id
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WHERE t.type = 'U'
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ORDER BY s.name, t.name`, safeDB, safeDB)
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data, _, err := s.Query(query)
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if err != nil {
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return nil, err
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}
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var tables []string
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for _, row := range data {
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schema, okSchema := row["schema_name"]
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name, okName := row["table_name"]
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if okSchema && okName {
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tables = append(tables, fmt.Sprintf("%v.%v", schema, name))
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continue
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}
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if okName {
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tables = append(tables, fmt.Sprintf("%v", name))
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}
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}
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return tables, nil
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}
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func (s *SqlServerDB) GetCreateStatement(dbName, tableName string) (string, error) {
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return fmt.Sprintf("-- SHOW CREATE TABLE not supported for SQL Server in this version.\n-- Table: %s.%s", dbName, tableName), nil
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}
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func (s *SqlServerDB) GetColumns(dbName, tableName string) ([]connection.ColumnDefinition, error) {
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schema := "dbo"
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table := strings.TrimSpace(tableName)
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if parts := strings.SplitN(table, ".", 2); len(parts) == 2 {
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schema = strings.TrimSpace(parts[0])
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table = strings.TrimSpace(parts[1])
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}
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if table == "" {
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return nil, fmt.Errorf("table name required")
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}
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esc := func(s string) string { return strings.ReplaceAll(s, "'", "''") }
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safeDB := quoteBracket(dbName)
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query := fmt.Sprintf(`
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SELECT
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c.name AS column_name,
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t.name + CASE
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WHEN t.name IN ('varchar', 'nvarchar', 'char', 'nchar') THEN '(' + CASE WHEN c.max_length = -1 THEN 'MAX' ELSE CAST(CASE WHEN t.name IN ('nvarchar', 'nchar') THEN c.max_length / 2 ELSE c.max_length END AS VARCHAR) END + ')'
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WHEN t.name IN ('decimal', 'numeric') THEN '(' + CAST(c.precision AS VARCHAR) + ',' + CAST(c.scale AS VARCHAR) + ')'
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ELSE ''
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END AS data_type,
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CASE WHEN c.is_nullable = 1 THEN 'YES' ELSE 'NO' END AS is_nullable,
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dc.definition AS column_default,
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ep.value AS comment,
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CASE WHEN pk.column_id IS NOT NULL THEN 'PRI' ELSE '' END AS column_key,
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CASE WHEN c.is_identity = 1 THEN 'auto_increment' ELSE '' END AS extra
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FROM [%s].sys.columns c
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JOIN [%s].sys.types t ON c.user_type_id = t.user_type_id
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JOIN [%s].sys.tables tb ON c.object_id = tb.object_id
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JOIN [%s].sys.schemas s ON tb.schema_id = s.schema_id
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LEFT JOIN [%s].sys.default_constraints dc ON c.default_object_id = dc.object_id
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LEFT JOIN [%s].sys.extended_properties ep ON ep.major_id = c.object_id AND ep.minor_id = c.column_id AND ep.name = 'MS_Description'
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LEFT JOIN (
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SELECT ic.object_id, ic.column_id
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FROM [%s].sys.index_columns ic
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JOIN [%s].sys.indexes i ON ic.object_id = i.object_id AND ic.index_id = i.index_id
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WHERE i.is_primary_key = 1
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) pk ON pk.object_id = c.object_id AND pk.column_id = c.column_id
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WHERE s.name = '%s' AND tb.name = '%s'
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ORDER BY c.column_id`,
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safeDB, safeDB, safeDB, safeDB, safeDB, safeDB, safeDB, safeDB,
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esc(schema), esc(table))
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data, _, err := s.Query(query)
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if err != nil {
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return nil, err
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}
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var columns []connection.ColumnDefinition
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for _, row := range data {
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col := connection.ColumnDefinition{
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Name: fmt.Sprintf("%v", row["column_name"]),
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Type: fmt.Sprintf("%v", row["data_type"]),
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Nullable: fmt.Sprintf("%v", row["is_nullable"]),
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Key: fmt.Sprintf("%v", row["column_key"]),
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Extra: fmt.Sprintf("%v", row["extra"]),
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Comment: "",
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}
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if v, ok := row["comment"]; ok && v != nil {
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col.Comment = fmt.Sprintf("%v", v)
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}
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if v, ok := row["column_default"]; ok && v != nil {
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def := fmt.Sprintf("%v", v)
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col.Default = &def
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}
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columns = append(columns, col)
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}
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return columns, nil
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}
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func (s *SqlServerDB) GetAllColumns(dbName string) ([]connection.ColumnDefinitionWithTable, error) {
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safeDB := quoteBracket(dbName)
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query := fmt.Sprintf(`
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SELECT s.name AS schema_name, t.name AS table_name, c.name AS column_name, tp.name AS data_type
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FROM [%s].sys.columns c
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JOIN [%s].sys.tables t ON c.object_id = t.object_id
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JOIN [%s].sys.schemas s ON t.schema_id = s.schema_id
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JOIN [%s].sys.types tp ON c.user_type_id = tp.user_type_id
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WHERE t.type = 'U'
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ORDER BY s.name, t.name, c.column_id`, safeDB, safeDB, safeDB, safeDB)
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data, _, err := s.Query(query)
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if err != nil {
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return nil, err
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}
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var cols []connection.ColumnDefinitionWithTable
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for _, row := range data {
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schema := fmt.Sprintf("%v", row["schema_name"])
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table := fmt.Sprintf("%v", row["table_name"])
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tableName := fmt.Sprintf("%s.%s", schema, table)
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col := connection.ColumnDefinitionWithTable{
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TableName: tableName,
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Name: fmt.Sprintf("%v", row["column_name"]),
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Type: fmt.Sprintf("%v", row["data_type"]),
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}
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cols = append(cols, col)
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}
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return cols, nil
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}
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func (s *SqlServerDB) GetIndexes(dbName, tableName string) ([]connection.IndexDefinition, error) {
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schema := "dbo"
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table := strings.TrimSpace(tableName)
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if parts := strings.SplitN(table, ".", 2); len(parts) == 2 {
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schema = strings.TrimSpace(parts[0])
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table = strings.TrimSpace(parts[1])
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}
|
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|
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if table == "" {
|
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return nil, fmt.Errorf("table name required")
|
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}
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esc := func(s string) string { return strings.ReplaceAll(s, "'", "''") }
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safeDB := quoteBracket(dbName)
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query := fmt.Sprintf(`
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SELECT
|
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i.name AS index_name,
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c.name AS column_name,
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i.is_unique,
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ic.key_ordinal AS seq_in_index,
|
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i.type_desc AS index_type
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FROM [%s].sys.indexes i
|
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JOIN [%s].sys.index_columns ic ON i.object_id = ic.object_id AND i.index_id = ic.index_id
|
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JOIN [%s].sys.columns c ON ic.object_id = c.object_id AND ic.column_id = c.column_id
|
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JOIN [%s].sys.tables t ON i.object_id = t.object_id
|
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JOIN [%s].sys.schemas s ON t.schema_id = s.schema_id
|
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WHERE s.name = '%s' AND t.name = '%s' AND i.name IS NOT NULL
|
||||
ORDER BY i.name, ic.key_ordinal`,
|
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safeDB, safeDB, safeDB, safeDB, safeDB, esc(schema), esc(table))
|
||||
|
||||
data, _, err := s.Query(query)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
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var indexes []connection.IndexDefinition
|
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for _, row := range data {
|
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isUnique := false
|
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if v, ok := row["is_unique"]; ok && v != nil {
|
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switch val := v.(type) {
|
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case bool:
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isUnique = val
|
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case int64:
|
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isUnique = val == 1
|
||||
}
|
||||
}
|
||||
|
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nonUnique := 1
|
||||
if isUnique {
|
||||
nonUnique = 0
|
||||
}
|
||||
|
||||
seq := 0
|
||||
if v, ok := row["seq_in_index"]; ok && v != nil {
|
||||
switch val := v.(type) {
|
||||
case int:
|
||||
seq = val
|
||||
case int64:
|
||||
seq = int(val)
|
||||
}
|
||||
}
|
||||
|
||||
indexType := "NONCLUSTERED"
|
||||
if v, ok := row["index_type"]; ok && v != nil {
|
||||
indexType = strings.ToUpper(fmt.Sprintf("%v", v))
|
||||
}
|
||||
|
||||
idx := connection.IndexDefinition{
|
||||
Name: fmt.Sprintf("%v", row["index_name"]),
|
||||
ColumnName: fmt.Sprintf("%v", row["column_name"]),
|
||||
NonUnique: nonUnique,
|
||||
SeqInIndex: seq,
|
||||
IndexType: indexType,
|
||||
}
|
||||
indexes = append(indexes, idx)
|
||||
}
|
||||
return indexes, nil
|
||||
}
|
||||
|
||||
func (s *SqlServerDB) GetForeignKeys(dbName, tableName string) ([]connection.ForeignKeyDefinition, error) {
|
||||
schema := "dbo"
|
||||
table := strings.TrimSpace(tableName)
|
||||
|
||||
if parts := strings.SplitN(table, ".", 2); len(parts) == 2 {
|
||||
schema = strings.TrimSpace(parts[0])
|
||||
table = strings.TrimSpace(parts[1])
|
||||
}
|
||||
|
||||
if table == "" {
|
||||
return nil, fmt.Errorf("table name required")
|
||||
}
|
||||
|
||||
esc := func(s string) string { return strings.ReplaceAll(s, "'", "''") }
|
||||
safeDB := quoteBracket(dbName)
|
||||
|
||||
query := fmt.Sprintf(`
|
||||
SELECT
|
||||
fk.name AS constraint_name,
|
||||
c.name AS column_name,
|
||||
rs.name AS foreign_schema,
|
||||
rt.name AS foreign_table,
|
||||
rc.name AS foreign_column
|
||||
FROM [%s].sys.foreign_keys fk
|
||||
JOIN [%s].sys.foreign_key_columns fkc ON fk.object_id = fkc.constraint_object_id
|
||||
JOIN [%s].sys.columns c ON fkc.parent_object_id = c.object_id AND fkc.parent_column_id = c.column_id
|
||||
JOIN [%s].sys.tables t ON fk.parent_object_id = t.object_id
|
||||
JOIN [%s].sys.schemas s ON t.schema_id = s.schema_id
|
||||
JOIN [%s].sys.tables rt ON fk.referenced_object_id = rt.object_id
|
||||
JOIN [%s].sys.schemas rs ON rt.schema_id = rs.schema_id
|
||||
JOIN [%s].sys.columns rc ON fkc.referenced_object_id = rc.object_id AND fkc.referenced_column_id = rc.column_id
|
||||
WHERE s.name = '%s' AND t.name = '%s'
|
||||
ORDER BY fk.name`,
|
||||
safeDB, safeDB, safeDB, safeDB, safeDB, safeDB, safeDB, safeDB, esc(schema), esc(table))
|
||||
|
||||
data, _, err := s.Query(query)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
var fks []connection.ForeignKeyDefinition
|
||||
for _, row := range data {
|
||||
refSchema := fmt.Sprintf("%v", row["foreign_schema"])
|
||||
refTable := fmt.Sprintf("%v", row["foreign_table"])
|
||||
refTableName := fmt.Sprintf("%s.%s", refSchema, refTable)
|
||||
|
||||
fk := connection.ForeignKeyDefinition{
|
||||
Name: fmt.Sprintf("%v", row["constraint_name"]),
|
||||
ColumnName: fmt.Sprintf("%v", row["column_name"]),
|
||||
RefTableName: refTableName,
|
||||
RefColumnName: fmt.Sprintf("%v", row["foreign_column"]),
|
||||
ConstraintName: fmt.Sprintf("%v", row["constraint_name"]),
|
||||
}
|
||||
fks = append(fks, fk)
|
||||
}
|
||||
return fks, nil
|
||||
}
|
||||
|
||||
func (s *SqlServerDB) GetTriggers(dbName, tableName string) ([]connection.TriggerDefinition, error) {
|
||||
schema := "dbo"
|
||||
table := strings.TrimSpace(tableName)
|
||||
|
||||
if parts := strings.SplitN(table, ".", 2); len(parts) == 2 {
|
||||
schema = strings.TrimSpace(parts[0])
|
||||
table = strings.TrimSpace(parts[1])
|
||||
}
|
||||
|
||||
if table == "" {
|
||||
return nil, fmt.Errorf("table name required")
|
||||
}
|
||||
|
||||
esc := func(s string) string { return strings.ReplaceAll(s, "'", "''") }
|
||||
safeDB := quoteBracket(dbName)
|
||||
|
||||
query := fmt.Sprintf(`
|
||||
SELECT
|
||||
tr.name AS trigger_name,
|
||||
CASE WHEN tr.is_instead_of_trigger = 1 THEN 'INSTEAD OF' ELSE 'AFTER' END AS timing,
|
||||
STUFF((
|
||||
SELECT ', ' + te.type_desc
|
||||
FROM [%s].sys.trigger_events te
|
||||
WHERE te.object_id = tr.object_id
|
||||
FOR XML PATH('')
|
||||
), 1, 2, '') AS event,
|
||||
OBJECT_DEFINITION(tr.object_id) AS statement
|
||||
FROM [%s].sys.triggers tr
|
||||
JOIN [%s].sys.tables t ON tr.parent_id = t.object_id
|
||||
JOIN [%s].sys.schemas s ON t.schema_id = s.schema_id
|
||||
WHERE s.name = '%s' AND t.name = '%s'
|
||||
ORDER BY tr.name`,
|
||||
safeDB, safeDB, safeDB, safeDB, esc(schema), esc(table))
|
||||
|
||||
data, _, err := s.Query(query)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
var triggers []connection.TriggerDefinition
|
||||
for _, row := range data {
|
||||
trig := connection.TriggerDefinition{
|
||||
Name: fmt.Sprintf("%v", row["trigger_name"]),
|
||||
Timing: fmt.Sprintf("%v", row["timing"]),
|
||||
Event: fmt.Sprintf("%v", row["event"]),
|
||||
Statement: "",
|
||||
}
|
||||
if v, ok := row["statement"]; ok && v != nil {
|
||||
trig.Statement = fmt.Sprintf("%v", v)
|
||||
}
|
||||
triggers = append(triggers, trig)
|
||||
}
|
||||
return triggers, nil
|
||||
}
|
||||
|
||||
func (s *SqlServerDB) ApplyChanges(tableName string, changes connection.ChangeSet) error {
|
||||
if s.conn == nil {
|
||||
return fmt.Errorf("connection not open")
|
||||
}
|
||||
|
||||
tx, err := s.conn.Begin()
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
defer tx.Rollback()
|
||||
|
||||
quoteIdent := func(name string) string {
|
||||
n := strings.TrimSpace(name)
|
||||
n = strings.Trim(n, "[]")
|
||||
n = strings.ReplaceAll(n, "]", "]]")
|
||||
if n == "" {
|
||||
return "[]"
|
||||
}
|
||||
return "[" + n + "]"
|
||||
}
|
||||
|
||||
schema := "dbo"
|
||||
table := strings.TrimSpace(tableName)
|
||||
if parts := strings.SplitN(table, ".", 2); len(parts) == 2 {
|
||||
schema = strings.TrimSpace(parts[0])
|
||||
table = strings.TrimSpace(parts[1])
|
||||
}
|
||||
|
||||
qualifiedTable := fmt.Sprintf("%s.%s", quoteIdent(schema), quoteIdent(table))
|
||||
|
||||
// 1. Deletes
|
||||
for _, pk := range changes.Deletes {
|
||||
var wheres []string
|
||||
var args []interface{}
|
||||
idx := 0
|
||||
for k, v := range pk {
|
||||
idx++
|
||||
wheres = append(wheres, fmt.Sprintf("%s = @p%d", quoteIdent(k), idx))
|
||||
args = append(args, sql.Named(fmt.Sprintf("p%d", idx), v))
|
||||
}
|
||||
if len(wheres) == 0 {
|
||||
continue
|
||||
}
|
||||
query := fmt.Sprintf("DELETE FROM %s WHERE %s", qualifiedTable, strings.Join(wheres, " AND "))
|
||||
if _, err := tx.Exec(query, args...); err != nil {
|
||||
return fmt.Errorf("delete error: %v", err)
|
||||
}
|
||||
}
|
||||
|
||||
// 2. Updates
|
||||
for _, update := range changes.Updates {
|
||||
var sets []string
|
||||
var args []interface{}
|
||||
idx := 0
|
||||
|
||||
for k, v := range update.Values {
|
||||
idx++
|
||||
sets = append(sets, fmt.Sprintf("%s = @p%d", quoteIdent(k), idx))
|
||||
args = append(args, sql.Named(fmt.Sprintf("p%d", idx), v))
|
||||
}
|
||||
|
||||
if len(sets) == 0 {
|
||||
continue
|
||||
}
|
||||
|
||||
var wheres []string
|
||||
for k, v := range update.Keys {
|
||||
idx++
|
||||
wheres = append(wheres, fmt.Sprintf("%s = @p%d", quoteIdent(k), idx))
|
||||
args = append(args, sql.Named(fmt.Sprintf("p%d", idx), v))
|
||||
}
|
||||
|
||||
if len(wheres) == 0 {
|
||||
return fmt.Errorf("update requires keys")
|
||||
}
|
||||
|
||||
query := fmt.Sprintf("UPDATE %s SET %s WHERE %s", qualifiedTable, strings.Join(sets, ", "), strings.Join(wheres, " AND "))
|
||||
if _, err := tx.Exec(query, args...); err != nil {
|
||||
return fmt.Errorf("update error: %v", err)
|
||||
}
|
||||
}
|
||||
|
||||
// 3. Inserts
|
||||
for _, row := range changes.Inserts {
|
||||
var cols []string
|
||||
var placeholders []string
|
||||
var args []interface{}
|
||||
idx := 0
|
||||
|
||||
for k, v := range row {
|
||||
idx++
|
||||
cols = append(cols, quoteIdent(k))
|
||||
placeholders = append(placeholders, fmt.Sprintf("@p%d", idx))
|
||||
args = append(args, sql.Named(fmt.Sprintf("p%d", idx), v))
|
||||
}
|
||||
|
||||
if len(cols) == 0 {
|
||||
continue
|
||||
}
|
||||
|
||||
query := fmt.Sprintf("INSERT INTO %s (%s) VALUES (%s)", qualifiedTable, strings.Join(cols, ", "), strings.Join(placeholders, ", "))
|
||||
if _, err := tx.Exec(query, args...); err != nil {
|
||||
return fmt.Errorf("insert error: %v", err)
|
||||
}
|
||||
}
|
||||
|
||||
return tx.Commit()
|
||||
}
|
||||
Reference in New Issue
Block a user