mirror of
https://gitee.com/johng/gf.git
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128 lines
3.6 KiB
Go
128 lines
3.6 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/mattn/go-sqlite3"
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// 2. It does not support Save/Replace features.
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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/gfile"
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"github.com/gogf/gf/text/gstr"
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"strings"
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)
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// DriverSqlite is the driver for sqlite database.
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type DriverSqlite struct {
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*Core
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}
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// New creates and returns a database object for sqlite.
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// It implements the interface of gdb.Driver for extra database driver installation.
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func (d *DriverSqlite) New(core *Core, node *ConfigNode) (DB, error) {
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return &DriverSqlite{
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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 sqlite.
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func (d *DriverSqlite) Open(config *ConfigNode) (*sql.DB, error) {
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var source string
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var err error
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if config.LinkInfo != "" {
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source = config.LinkInfo
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} else {
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source = config.Name
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}
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source, err = gfile.Search(source)
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if err != nil {
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return nil, err
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}
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intlog.Printf("Open: %s", source)
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if db, err := sql.Open("sqlite3", 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 *DriverSqlite) 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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// TODO 需要增加对Save方法的支持，可使用正则来实现替换，
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// TODO 将ON DUPLICATE KEY UPDATE触发器修改为两条SQL语句(INSERT OR IGNORE & UPDATE)
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func (d *DriverSqlite) HandleSqlBeforeCommit(link Link, sql string, args []interface{}) (string, []interface{}) {
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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 *DriverSqlite) 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 SQLITE_MASTER WHERE TYPE='table' 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 *DriverSqlite) 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(`sqlite_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(`PRAGMA TABLE_INFO(%s)`, 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["name"].String())] = &TableField{
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Index: i,
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Name: strings.ToLower(m["name"].String()),
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Type: strings.ToLower(m["type"].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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