forked from GoAdminGroup/go-admin
/
mysql.go
233 lines (192 loc) · 4.88 KB
/
mysql.go
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package mysql
import (
"context"
"database/sql"
"errors"
_ "github.com/go-sql-driver/mysql"
"github.com/chenhg5/go-admin/modules/config"
"github.com/chenhg5/go-admin/modules/connections/converter"
"github.com/chenhg5/go-admin/modules/connections/performer"
"sync"
)
type SqlTxStruct struct {
Tx *sql.Tx
}
type Mysql struct {
SqlDBmap map[string]*sql.DB
Once sync.Once
}
var DB = Mysql{
SqlDBmap: map[string]*sql.DB{},
}
func GetMysqlDB() *Mysql {
return &DB
}
func (db *Mysql) InitDB(cfglist map[string]config.Database) {
db.Once.Do(func() {
var (
err error
SqlDB *sql.DB
)
for conn, cfg := range cfglist {
SqlDB, err = sql.Open("mysql", cfg.USER+
":"+cfg.PWD+"@tcp("+cfg.HOST+":"+cfg.PORT+")/"+cfg.NAME+"?charset=utf8mb4")
if err != nil {
SqlDB.Close()
panic(err.Error())
} else {
// 设置数据库最大连接 减少timewait 正式环境调大
SqlDB.SetMaxIdleConns(cfg.MAX_IDLE_CON) // 连接池连接数 = mysql最大连接数/2
SqlDB.SetMaxOpenConns(cfg.MAX_OPEN_CON) // 最大打开连接 = mysql最大连接数
db.SqlDBmap[conn] = SqlDB
}
}
})
}
func (db *Mysql) QueryWithConnection(con string, query string, args ...interface{}) ([]map[string]interface{}, *sql.Rows) {
rs, err := db.SqlDBmap[con].Query(query, args...)
if err != nil {
if rs != nil {
rs.Close()
}
panic(err)
}
col, colErr := rs.Columns()
if colErr != nil {
if rs != nil {
rs.Close()
}
panic(colErr)
}
typeVal, err := rs.ColumnTypes()
if err != nil {
if rs != nil {
rs.Close()
}
panic(err)
}
results := make([]map[string]interface{}, 0)
for rs.Next() {
var colVar = make([]interface{}, len(col))
for i := 0; i < len(col); i++ {
converter.SetColVarType(&colVar, i, typeVal[i].DatabaseTypeName())
}
result := make(map[string]interface{})
if scanErr := rs.Scan(colVar...); scanErr != nil {
rs.Close()
panic(scanErr)
}
for j := 0; j < len(col); j++ {
converter.SetResultValue(&result, col[j], colVar[j], typeVal[j].DatabaseTypeName())
}
results = append(results, result)
}
if err := rs.Err(); err != nil {
if rs != nil {
rs.Close()
}
panic(err)
}
rs.Close()
return results, rs
}
func (db *Mysql) Query(query string, args ...interface{}) ([]map[string]interface{}, *sql.Rows) {
return performer.Query(db.SqlDBmap["default"], query, args...)
}
func (db *Mysql) Exec(query string, args ...interface{}) sql.Result {
return performer.Exec(db.SqlDBmap["default"], query, args...)
}
func (db *Mysql) BeginTransactionsByLevel() *SqlTxStruct {
//LevelDefault IsolationLevel = iota
//LevelReadUncommitted
//LevelReadCommitted
//LevelWriteCommitted
//LevelRepeatableRead
//LevelSnapshot
//LevelSerializable
//LevelLinearizable
SqlTx := new(SqlTxStruct)
tx, err := db.SqlDBmap["default"].BeginTx(context.Background(),
&sql.TxOptions{Isolation: sql.LevelReadUncommitted})
if err != nil {
panic(err)
}
(*SqlTx).Tx = tx
return SqlTx
}
func (db *Mysql) BeginTransactions() *SqlTxStruct {
tx, err := db.SqlDBmap["default"].BeginTx(context.Background(),
&sql.TxOptions{Isolation: sql.LevelDefault})
if err != nil {
panic(err)
}
SqlTx := new(SqlTxStruct)
(*SqlTx).Tx = tx
return SqlTx
}
func (SqlTx *SqlTxStruct) Exec(query string, args ...interface{}) (sql.Result, error) {
rs, err := SqlTx.Tx.Exec(query, args...)
if err != nil {
return nil, err
}
if rows, execError := rs.RowsAffected(); execError != nil || rows == 0 {
return nil, errors.New("exec fail")
}
return rs, nil
}
func (SqlTx *SqlTxStruct) Query(query string, args ...interface{}) ([]map[string]interface{}, error) {
rs, err := SqlTx.Tx.Query(query, args...)
if err != nil {
return nil, err
}
col, colErr := rs.Columns()
if colErr != nil {
rs.Close()
panic(colErr)
}
typeVal, err := rs.ColumnTypes()
if err != nil {
rs.Close()
panic(err)
}
results := make([]map[string]interface{}, 0)
for rs.Next() {
var colVar = make([]interface{}, len(col))
for i := 0; i < len(col); i++ {
converter.SetColVarType(&colVar, i, typeVal[i].DatabaseTypeName())
}
result := make(map[string]interface{})
if scanErr := rs.Scan(colVar...); scanErr != nil {
rs.Close()
panic(scanErr)
}
for j := 0; j < len(col); j++ {
converter.SetResultValue(&result, col[j], colVar[j], typeVal[j].DatabaseTypeName())
}
results = append(results, result)
}
if err := rs.Err(); err != nil {
rs.Close()
panic(err)
}
return results, nil
}
type TxFn func(*SqlTxStruct) (error, map[string]interface{})
func (db *Mysql) WithTransaction(fn TxFn) (err error, res map[string]interface{}) {
SqlTx := db.BeginTransactions()
defer func() {
if p := recover(); p != nil {
// a panic occurred, rollback and repanic
SqlTx.Tx.Rollback()
panic(p)
} else if err != nil {
// something went wrong, rollback
SqlTx.Tx.Rollback()
} else {
// all good, commit
err = SqlTx.Tx.Commit()
}
}()
err, res = fn(SqlTx)
return
}