mirror of
https://gitee.com/johng/gf.git
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150 lines
4.4 KiB
Go
150 lines
4.4 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/lib/pq"
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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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"github.com/gogf/gf/internal/intlog"
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"github.com/gogf/gf/os/gcache"
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"github.com/gogf/gf/text/gstr"
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"strings"
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"github.com/gogf/gf/text/gregex"
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)
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// DriverPgsql is the driver for postgresql database.
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type DriverPgsql struct {
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*Core
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}
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// New creates and returns a database object for postgresql.
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// It implements the interface of gdb.Driver for extra database driver installation.
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func (d *DriverPgsql) New(core *Core, node *ConfigNode) (DB, error) {
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return &DriverPgsql{
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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 pgsql.
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func (d *DriverPgsql) Open(config *ConfigNode) (*sql.DB, error) {
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var source string
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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=%s password=%s host=%s port=%s dbname=%s sslmode=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("postgres", 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 *DriverPgsql) 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 *DriverPgsql) 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 "$x".
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sql, _ = gregex.ReplaceStringFunc("\\?", sql, func(s string) string {
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index++
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return fmt.Sprintf("$%d", index)
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})
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sql, _ = gregex.ReplaceString(` LIMIT (\d+),\s*(\d+)`, ` LIMIT $2 OFFSET $1`, sql)
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return sql, args
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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 *DriverPgsql) 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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query := "SELECT TABLENAME FROM PG_TABLES WHERE SCHEMANAME = 'public' ORDER BY TABLENAME"
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if len(schema) > 0 && schema[0] != "" {
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query = fmt.Sprintf("SELECT TABLENAME FROM PG_TABLES WHERE SCHEMANAME = '%s' ORDER BY TABLENAME", schema[0])
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}
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result, err = d.DB.DoGetAll(link, query)
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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 *DriverPgsql) 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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table, _ = gregex.ReplaceString("\"", "", table)
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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, _ := gcache.GetOrSetFunc(
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fmt.Sprintf(`pgsql_table_fields_%s_%s`, table, checkSchema),
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func() (interface{}, error) {
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var (
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result Result
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link *sql.DB
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)
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link, err = d.DB.GetSlave(checkSchema)
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if err != nil {
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return nil, err
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}
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structureSql := fmt.Sprintf(`
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SELECT a.attname AS field, t.typname AS type FROM pg_class c, pg_attribute a
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LEFT OUTER JOIN pg_description b ON a.attrelid=b.objoid AND a.attnum = b.objsubid,pg_type t
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WHERE c.relname = '%s' and a.attnum > 0 and a.attrelid = c.oid and a.atttypid = t.oid
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ORDER BY a.attnum`,
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strings.ToLower(table),
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)
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structureSql, _ = gregex.ReplaceString(`[\n\r\s]+`, " ", gstr.Trim(structureSql))
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result, err = d.DB.DoGetAll(link, structureSql)
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if err != nil {
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return nil, err
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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[m["field"].String()] = &TableField{
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Index: i,
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Name: m["field"].String(),
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Type: m["type"].String(),
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}
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}
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return fields, nil
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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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