/
default.go
180 lines (154 loc) · 4.16 KB
/
default.go
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package dao
import (
"fmt"
"github.com/daiguadaidai/mysql-flashback/gdbc"
"github.com/daiguadaidai/mysql-flashback/models"
"github.com/jinzhu/gorm"
)
type DefaultDao struct {
DB *gorm.DB
}
func NewDefaultDao() *DefaultDao {
return &DefaultDao{
DB: gdbc.GetOrmInstance().DB,
}
}
func (this *DefaultDao) ShowBinaryLogs() ([]*models.BinaryLog, error) {
sql := `SHOW BINARY LOGS;`
var bLogs []*models.BinaryLog
if err := this.DB.Raw(sql).Find(&bLogs).Error; err != nil {
return nil, err
}
return bLogs, nil
}
func (this *DefaultDao) ShowMasterStatus() (*models.Position, error) {
sql := `SHOW MASTER STATUS`
pos := new(models.Position)
if err := this.DB.Raw(sql).Scan(pos).Error; err != nil {
return nil, err
}
return pos, nil
}
// 删除一个不存在的表
func (this *DefaultDao) DropNotExistsTable() error {
sql := "DROP TABLE IF EXISTS `__gmod__`.`__gmod__`"
return this.DB.Raw(sql).Error
}
// 获取表通过schema
func (this *DefaultDao) FindTablesBySchema(sName string) ([]*models.DBTable, error) {
sql := `
SELECT TABLE_SCHEMA,
TABLE_NAME
FROM information_schema.TABLES
WHERE TABLE_TYPE = 'BASE TABLE'
AND TABLE_SCHEMA = ?
`
var tables []*models.DBTable
if err := this.DB.Raw(sql, sName).Find(&tables).Error; err != nil {
return nil, err
}
return tables, nil
}
// 获取表中所有的字段
func (this *DefaultDao) FindTableColumnNames(sName string, tName string) ([]string, error) {
sql := `
SELECT COLUMN_NAME
FROM information_schema.COLUMNS
WHERE TABLE_SCHEMA = ?
AND TABLE_NAME = ?
ORDER BY ORDINAL_POSITION ASC
`
var cNames []string
if err := this.DB.Raw(sql, sName, tName).Pluck("COLUMN_NAME", &cNames).
Error; err != nil {
return nil, err
}
return cNames, nil
}
// 获取主键字段名
func (this *DefaultDao) FindTablePKColumnNames(sName string, tName string) ([]string, error) {
sql := `
SELECT S.COLUMN_NAME
FROM INFORMATION_SCHEMA.TABLE_CONSTRAINTS AS TC
LEFT JOIN INFORMATION_SCHEMA.STATISTICS AS S
ON TC.TABLE_SCHEMA = S.INDEX_SCHEMA
AND TC.TABLE_NAME = S.TABLE_NAME
AND TC.CONSTRAINT_NAME = S.INDEX_NAME
WHERE TC.TABLE_SCHEMA = ?
AND TC.TABLE_NAME = ?
AND TC.CONSTRAINT_TYPE = 'PRIMARY KEY'
ORDER BY SEQ_IN_INDEX ASC
`
var cNames []string
if err := this.DB.Raw(sql, sName, tName).Pluck("COLUMN_NAME", &cNames).
Error; err != nil {
return nil, err
}
return cNames, nil
}
// 获取唯一键字段
func (this *DefaultDao) FindTableUKColumnNames(sName string, tName string) ([]string, string, error) {
ukName, err := this.GetUKName(sName, tName)
if err != nil {
if err.Error() == "sql: no rows in result set" {
return make([]string, 0), "", nil
}
return nil, "", err
}
if ukName == "" {
return make([]string, 0), "", nil
}
sql := `
SELECT COLUMN_NAME
FROM INFORMATION_SCHEMA.STATISTICS
WHERE TABLE_SCHEMA = ?
AND TABLE_NAME = ?
AND INDEX_NAME = ?
ORDER BY SEQ_IN_INDEX ASC
`
var cNames []string
if err := this.DB.Raw(sql, sName, tName, ukName).Pluck("COLUMN_NAME", &cNames).
Error; err != nil {
return nil, "", err
}
return cNames, ukName, nil
}
// 获取第一个唯一键
func (this *DefaultDao) GetUKName(sName string, tName string) (string, error) {
sql := `
SELECT CONSTRAINT_NAME
FROM INFORMATION_SCHEMA.TABLE_CONSTRAINTS
WHERE TABLE_SCHEMA = ?
AND TABLE_NAME = ?
AND CONSTRAINT_TYPE = 'UNIQUE'
LIMIT 0, 1;
`
var ukName string
if err := this.DB.Raw(sql, sName, tName).Row().Scan(&ukName); err != nil {
return "", err
}
return ukName, nil
}
// 执行dml
func (this *DefaultDao) ExecDML(sql string) error {
return this.DB.Exec(sql).Error
}
// 获取最老和最新的日志位点
func (this *DefaultDao) GetOldestAndNewestPos() (*models.Position, *models.Position, error) {
logs, err := this.ShowBinaryLogs()
if err != nil {
return nil, nil, err
}
if len(logs) == 0 {
return nil, nil, fmt.Errorf("没有binlog")
}
startPos := &models.Position{
File: logs[0].LogName,
Position: 4,
}
endPos := &models.Position{
File: logs[len(logs)-1].LogName,
Position: logs[len(logs)-1].FileSize,
}
return startPos, endPos, nil
}