mirror of
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256 lines
7.9 KiB
Go
256 lines
7.9 KiB
Go
// Copyright 2017 gf Author(https://github.com/gogf/gf). All Rights Reserved.
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//
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// This Source Code Form is subject to the terms of the MIT License.
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// If a copy of the MIT was not distributed with this file,
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// You can obtain one at https://github.com/gogf/gf.
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//
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// Note:
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// 1. It needs manually import: _ "github.com/denisenkom/go-mssqldb"
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// 2. It does not support Save/Replace features.
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// 3. It does not support LastInsertId.
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package gdb
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import (
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"database/sql"
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"errors"
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"fmt"
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"strconv"
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"strings"
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"github.com/gogf/gf/internal/intlog"
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"github.com/gogf/gf/text/gstr"
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"github.com/gogf/gf/text/gregex"
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)
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// DriverMssql is the driver for SQL server database.
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type DriverMssql struct {
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*Core
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}
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// New creates and returns a database object for SQL server.
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// It implements the interface of gdb.Driver for extra database driver installation.
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func (d *DriverMssql) New(core *Core, node *ConfigNode) (DB, error) {
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return &DriverMssql{
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Core: core,
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}, nil
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}
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// Open creates and returns a underlying sql.DB object for mssql.
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func (d *DriverMssql) Open(config *ConfigNode) (*sql.DB, error) {
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source := ""
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if config.LinkInfo != "" {
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source = config.LinkInfo
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} else {
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source = fmt.Sprintf(
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"user id=%s;password=%s;server=%s;port=%s;database=%s;encrypt=disable",
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config.User, config.Pass, config.Host, config.Port, config.Name,
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)
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}
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intlog.Printf("Open: %s", source)
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if db, err := sql.Open("sqlserver", source); err == nil {
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return db, 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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// GetChars returns the security char for this type of database.
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func (d *DriverMssql) GetChars() (charLeft string, charRight string) {
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return "\"", "\""
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}
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// HandleSqlBeforeCommit deals with the sql string before commits it to underlying sql driver.
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func (d *DriverMssql) HandleSqlBeforeCommit(link Link, sql string, args []interface{}) (string, []interface{}) {
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var index int
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// Convert place holder char '?' to string "@px".
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str, _ := gregex.ReplaceStringFunc("\\?", sql, func(s string) string {
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index++
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return fmt.Sprintf("@p%d", index)
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})
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str, _ = gregex.ReplaceString("\"", "", str)
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return d.parseSql(str), args
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}
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// parseSql does some replacement of the sql before commits it to underlying driver,
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// for support of microsoft sql server.
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func (d *DriverMssql) parseSql(sql string) string {
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// SELECT * FROM USER WHERE ID=1 LIMIT 1
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if m, _ := gregex.MatchString(`^SELECT(.+)LIMIT 1$`, sql); len(m) > 1 {
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return fmt.Sprintf(`SELECT TOP 1 %s`, m[1])
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}
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// SELECT * FROM USER WHERE AGE>18 ORDER BY ID DESC LIMIT 100, 200
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patten := `^\s*(?i)(SELECT)|(LIMIT\s*(\d+)\s*,\s*(\d+))`
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if gregex.IsMatchString(patten, sql) == false {
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return sql
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}
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res, err := gregex.MatchAllString(patten, sql)
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if err != nil {
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return ""
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}
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index := 0
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keyword := strings.TrimSpace(res[index][0])
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keyword = strings.ToUpper(keyword)
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index++
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switch keyword {
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case "SELECT":
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// LIMIT statement checks.
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if len(res) < 2 ||
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(strings.HasPrefix(res[index][0], "LIMIT") == false &&
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strings.HasPrefix(res[index][0], "limit") == false) {
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break
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}
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if gregex.IsMatchString("((?i)SELECT)(.+)((?i)LIMIT)", sql) == false {
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break
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}
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// ORDER BY statement checks.
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selectStr := ""
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orderStr := ""
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haveOrder := gregex.IsMatchString("((?i)SELECT)(.+)((?i)ORDER BY)", sql)
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if haveOrder {
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queryExpr, _ := gregex.MatchString("((?i)SELECT)(.+)((?i)ORDER BY)", sql)
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if len(queryExpr) != 4 ||
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strings.EqualFold(queryExpr[1], "SELECT") == false ||
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strings.EqualFold(queryExpr[3], "ORDER BY") == false {
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break
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}
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selectStr = queryExpr[2]
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orderExpr, _ := gregex.MatchString("((?i)ORDER BY)(.+)((?i)LIMIT)", sql)
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if len(orderExpr) != 4 ||
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strings.EqualFold(orderExpr[1], "ORDER BY") == false ||
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strings.EqualFold(orderExpr[3], "LIMIT") == false {
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break
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}
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orderStr = orderExpr[2]
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} else {
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queryExpr, _ := gregex.MatchString("((?i)SELECT)(.+)((?i)LIMIT)", sql)
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if len(queryExpr) != 4 ||
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strings.EqualFold(queryExpr[1], "SELECT") == false ||
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strings.EqualFold(queryExpr[3], "LIMIT") == false {
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break
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}
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selectStr = queryExpr[2]
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}
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first, limit := 0, 0
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for i := 1; i < len(res[index]); i++ {
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if len(strings.TrimSpace(res[index][i])) == 0 {
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continue
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}
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if strings.HasPrefix(res[index][i], "LIMIT") ||
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strings.HasPrefix(res[index][i], "limit") {
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first, _ = strconv.Atoi(res[index][i+1])
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limit, _ = strconv.Atoi(res[index][i+2])
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break
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}
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}
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if haveOrder {
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sql = fmt.Sprintf(
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"SELECT * FROM "+
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"(SELECT ROW_NUMBER() OVER (ORDER BY %s) as ROWNUMBER_, %s ) as TMP_ "+
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"WHERE TMP_.ROWNUMBER_ > %d AND TMP_.ROWNUMBER_ <= %d",
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orderStr, selectStr, first, first+limit,
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)
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} else {
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if first == 0 {
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first = limit
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}
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sql = fmt.Sprintf(
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"SELECT * FROM (SELECT TOP %d * FROM (SELECT TOP %d %s) as TMP1_ ) as TMP2_ ",
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limit, first+limit, selectStr,
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)
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}
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default:
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}
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return sql
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}
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// Tables retrieves and returns the tables of current schema.
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// It's mainly used in cli tool chain for automatically generating the models.
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func (d *DriverMssql) Tables(schema ...string) (tables []string, err error) {
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var result Result
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link, err := d.DB.GetSlave(schema...)
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if err != nil {
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return nil, err
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}
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result, err = d.DB.DoGetAll(link, `SELECT NAME FROM SYSOBJECTS WHERE XTYPE='U' AND STATUS >= 0 ORDER BY NAME`)
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if err != nil {
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return
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}
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for _, m := range result {
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for _, v := range m {
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tables = append(tables, v.String())
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}
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}
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return
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}
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// TableFields retrieves and returns the fields information of specified table of current schema.
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func (d *DriverMssql) TableFields(table string, schema ...string) (fields map[string]*TableField, err error) {
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charL, charR := d.GetChars()
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table = gstr.Trim(table, charL+charR)
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if gstr.Contains(table, " ") {
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return nil, errors.New("function TableFields supports only single table operations")
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}
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checkSchema := d.DB.GetSchema()
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if len(schema) > 0 && schema[0] != "" {
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checkSchema = schema[0]
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}
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v := d.DB.GetCache().GetOrSetFunc(
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fmt.Sprintf(`mssql_table_fields_%s_%s`, table, checkSchema), func() interface{} {
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var result Result
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var link *sql.DB
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link, err = d.DB.GetSlave(checkSchema)
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if err != nil {
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return nil
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}
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result, err = d.DB.DoGetAll(link, fmt.Sprintf(`
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SELECT a.name Field,
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CASE b.name
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WHEN 'datetime' THEN 'datetime'
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WHEN 'numeric' THEN b.name + '(' + convert(varchar(20),a.xprec) + ',' + convert(varchar(20),a.xscale) + ')'
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WHEN 'char' THEN b.name + '(' + convert(varchar(20),a.length)+ ')'
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WHEN 'varchar' THEN b.name + '(' + convert(varchar(20),a.length)+ ')'
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ELSE b.name + '(' + convert(varchar(20),a.length)+ ')' END as TYPE,
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case when a.isnullable=1 then 'YES'else 'NO' end as [Null],
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case when exists(SELECT 1 FROM sysobjects where xtype='PK' and name in (
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SELECT name FROM sysindexes WHERE indid in(
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SELECT indid FROM sysindexkeys WHERE id = a.id AND colid=a.colid
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))) then 'PRI' else '' end AS [Key],
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case when COLUMNPROPERTY(a.id,a.name,'IsIdentity')=1 then 'auto_increment'else '' end Extra,
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isnull(e.text,'') as [Default],
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isnull(g.[value],'') AS [Comment]
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FROM syscolumns a
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left join systypes b on a.xtype=b.xusertype
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inner join sysobjects d on a.id=d.id and d.xtype='U' and d.name<>'dtproperties'
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left join syscomments e on a.cdefault=e.id
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left join sys.extended_properties g on a.id=g.major_id and a.colid=g.minor_id
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left join sys.extended_properties f on d.id=f.major_id and f.minor_id =0
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where d.name='%s'
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order by a.id,a.colorder`, strings.ToUpper(table)))
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if err != nil {
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return nil
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}
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fields = make(map[string]*TableField)
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for i, m := range result {
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fields[strings.ToLower(m["FIELD"].String())] = &TableField{
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Index: i,
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Name: strings.ToLower(m["FIELD"].String()),
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Type: strings.ToLower(m["TYPE"].String()),
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Null: m["Null"].Bool(),
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Key: m["Key"].String(),
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Default: m["Default"].Val(),
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Extra: m["Extra"].String(),
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Comment: m["Comment"].String(),
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}
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}
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return fields
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}, 0)
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if err == nil {
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fields = v.(map[string]*TableField)
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}
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return
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}
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