内容简介：redis mysql 连接池 之 golang 实现
分享一下 golang 实现的 redis 和 mysql 连接池，可以在项目中直接引用连接池句柄，调用对应的方法。
举个栗子：
1 mysql 连接池的使用
（1） 在项目子目录放置 mysql.go
（2）在需要调用的地方导入连接池句柄 DB
（3）调用 DB.Query()
2 redis 连接池的使用
（1）在项目子目录放置 redis.go
（2）在需要调用的地方导入连接池句柄 Cache
（3）调用 Cache.SetString (“test_key”, “test_value”)
最新代码地址：
https://github.com/hopehook/golang-db
附件:
1 mysql 连接池代码
package lib
import (
"database/sql"
"fmt"
"strconv"
"github.com/arnehormann/sqlinternals/mysqlinternals"
_ "github.com/go-sql-driver/mysql"
)
var MYSQL map[string]string = map[string]string{
"host": "127.0.0.1:3306",
"database": "",
"user": "",
"password": "",
"maxOpenConns": "0",
"maxIdleConns": "0",
}
type SqlConnPool struct {
DriverName string
DataSourceName string
MaxOpenConns int64
MaxIdleConns int64
SqlDB *sql.DB // 连接池
}
var DB *SqlConnPool
func init() {
dataSourceName := fmt.Sprintf("%s:%s@tcp(%s)/%s", MYSQL["user"], MYSQL["password"], MYSQL["host"], MYSQL["database"])
maxOpenConns, _ := strconv.ParseInt(MYSQL["maxOpenConns"], 10, 64)
maxIdleConns, _ := strconv.ParseInt(MYSQL["maxIdleConns"], 10, 64)
DB = &SqlConnPool{
DriverName: "mysql",
DataSourceName: dataSourceName,
MaxOpenConns: maxOpenConns,
MaxIdleConns: maxIdleConns,
}
if err := DB.open(); err != nil {
panic("init db failed")
}
}
// 封装的连接池的方法
func (p *SqlConnPool) open() error {
var err error
p.SqlDB, err = sql.Open(p.DriverName, p.DataSourceName)
p.SqlDB.SetMaxOpenConns(int(p.MaxOpenConns))
p.SqlDB.SetMaxIdleConns(int(p.MaxIdleConns))
return err
}
func (p *SqlConnPool) Close() error {
return p.SqlDB.Close()
}
func (p *SqlConnPool) Query(queryStr string, args ...interface{}) ([]map[string]interface{}, error) {
rows, err := p.SqlDB.Query(queryStr, args...)
defer rows.Close()
if err != nil {
return []map[string]interface{}{}, err
}
// 返回属性字典
columns, err := mysqlinternals.Columns(rows)
// 获取字段类型
scanArgs := make([]interface{}, len(columns))
values := make([]sql.RawBytes, len(columns))
for i, _ := range values {
scanArgs[i] = &values[i]
}
rowsMap := make([]map[string]interface{}, 0, 10)
for rows.Next() {
rows.Scan(scanArgs...)
rowMap := make(map[string]interface{})
for i, value := range values {
rowMap[columns[i].Name()] = bytes2RealType(value, columns[i].MysqlType())
}
rowsMap = append(rowsMap, rowMap)
}
if err = rows.Err(); err != nil {
return []map[string]interface{}{}, err
}
return rowsMap, nil
}
func (p *SqlConnPool) execute(sqlStr string, args ...interface{}) (sql.Result, error) {
return p.SqlDB.Exec(sqlStr, args...)
}
func (p *SqlConnPool) Update(updateStr string, args ...interface{}) (int64, error) {
result, err := p.execute(updateStr, args...)
if err != nil {
return 0, err
}
affect, err := result.RowsAffected()
return affect, err
}
func (p *SqlConnPool) Insert(insertStr string, args ...interface{}) (int64, error) {
result, err := p.execute(insertStr, args...)
if err != nil {
return 0, err
}
lastid, err := result.LastInsertId()
return lastid, err
}
func (p *SqlConnPool) Delete(deleteStr string, args ...interface{}) (int64, error) {
result, err := p.execute(deleteStr, args...)
if err != nil {
return 0, err
}
affect, err := result.RowsAffected()
return affect, err
}
type SqlConnTransaction struct {
SqlTx *sql.Tx // 单个事务连接
}
//// 开启一个事务
func (p *SqlConnPool) Begin() (*SqlConnTransaction, error) {
var oneSqlConnTransaction = &SqlConnTransaction{}
var err error
if pingErr := p.SqlDB.Ping(); pingErr == nil {
oneSqlConnTransaction.SqlTx, err = p.SqlDB.Begin()
}
return oneSqlConnTransaction, err
}
// 封装的单个事务连接的方法
func (t *SqlConnTransaction) Rollback() error {
return t.SqlTx.Rollback()
}
func (t *SqlConnTransaction) Commit() error {
return t.SqlTx.Commit()
}
func (t *SqlConnTransaction) Query(queryStr string, args ...interface{}) ([]map[string]interface{}, error) {
rows, err := t.SqlTx.Query(queryStr, args...)
defer rows.Close()
if err != nil {
return []map[string]interface{}{}, err
}
// 返回属性字典
columns, err := mysqlinternals.Columns(rows)
// 获取字段类型
scanArgs := make([]interface{}, len(columns))
values := make([]sql.RawBytes, len(columns))
for i, _ := range values {
scanArgs[i] = &values[i]
}
rowsMap := make([]map[string]interface{}, 0, 10)
for rows.Next() {
rows.Scan(scanArgs...)
rowMap := make(map[string]interface{})
for i, value := range values {
rowMap[columns[i].Name()] = bytes2RealType(value, columns[i].MysqlType())
}
rowsMap = append(rowsMap, rowMap)
}
if err = rows.Err(); err != nil {
return []map[string]interface{}{}, err
}
return rowsMap, nil
}
func (t *SqlConnTransaction) execute(sqlStr string, args ...interface{}) (sql.Result, error) {
return t.SqlTx.Exec(sqlStr, args...)
}
func (t *SqlConnTransaction) Update(updateStr string, args ...interface{}) (int64, error) {
result, err := t.execute(updateStr, args...)
if err != nil {
return 0, err
}
affect, err := result.RowsAffected()
return affect, err
}
func (t *SqlConnTransaction) Insert(insertStr string, args ...interface{}) (int64, error) {
result, err := t.execute(insertStr, args...)
if err != nil {
return 0, err
}
lastid, err := result.LastInsertId()
return lastid, err
}
func (t *SqlConnTransaction) Delete(deleteStr string, args ...interface{}) (int64, error) {
result, err := t.execute(deleteStr, args...)
if err != nil {
return 0, err
}
affect, err := result.RowsAffected()
return affect, err
}
// others
func bytes2RealType(src []byte, columnType string) interface{} {
srcStr := string(src)
var result interface{}
switch columnType {
case "TINYINT":
fallthrough
case "SMALLINT":
fallthrough
case "INT":
fallthrough
case "BIGINT":
result, _ = strconv.ParseInt(srcStr, 10, 64)
case "CHAR":
fallthrough
case "VARCHAR":
fallthrough
case "BLOB":
fallthrough
case "TIMESTAMP":
fallthrough
case "DATETIME":
result = srcStr
case "FLOAT":
fallthrough
case "DOUBLE":
fallthrough
case "DECIMAL":
result, _ = strconv.ParseFloat(srcStr, 64)
default:
result = nil
}
return result
}
2 redis 连接池代码
package lib
import (
"strconv"
"time"
"github.com/garyburd/redigo/redis"
)
var REDIS map[string]string = map[string]string{
"host": "127.0.0.1:6379",
"database": "0",
"password": "",
"maxOpenConns": "0",
"maxIdleConns": "0",
}
var Cache *RedisConnPool
type RedisConnPool struct {
redisPool *redis.Pool
}
func init() {
Cache = &RedisConnPool{}
maxOpenConns, _ := strconv.ParseInt(REDIS["maxOpenConns"], 10, 64)
maxIdleConns, _ := strconv.ParseInt(REDIS["maxIdleConns"], 10, 64)
database, _ := strconv.ParseInt(REDIS["database"], 10, 64)
Cache.redisPool = newPool(REDIS["host"], REDIS["password"], int(database), int(maxOpenConns), int(maxIdleConns))
if Cache.redisPool == nil {
panic("init redis failed！")
}
}
func newPool(server, password string, database, maxOpenConns, maxIdleConns int) *redis.Pool {
return &redis.Pool{
MaxActive: maxOpenConns, // max number of connections
MaxIdle: maxIdleConns,
IdleTimeout: 10 * time.Second,
Dial: func() (redis.Conn, error) {
c, err := redis.Dial("tcp", server)
if err != nil {
return nil, err
}
if _, err := c.Do("AUTH", password); err != nil {
c.Close()
return nil, err
}
if _, err := c.Do("select", database); err != nil {
c.Close()
return nil, err
}
return c, err
},
TestOnBorrow: func(c redis.Conn, t time.Time) error {
_, err := c.Do("PING")
return err
},
}
}
// 关闭连接池
func (p *RedisConnPool) Close() error {
err := p.redisPool.Close()
return err
}
// 当前某一个数据库，执行命令
func (p *RedisConnPool) Do(command string, args ...interface{}) (interface{}, error) {
conn := p.redisPool.Get()
defer conn.Close()
return conn.Do(command, args...)
}
//// String（字符串）
func (p *RedisConnPool) SetString(key string, value interface{}) (interface{}, error) {
conn := p.redisPool.Get()
defer conn.Close()
return conn.Do("SET", key, value)
}
func (p *RedisConnPool) GetString(key string) (string, error) {
// 从连接池里面获得一个连接
conn := p.redisPool.Get()
// 连接完关闭，其实没有关闭，是放回池里，也就是队列里面，等待下一个重用
defer conn.Close()
return redis.String(conn.Do("GET", key))
}
func (p *RedisConnPool) GetBytes(key string) ([]byte, error) {
conn := p.redisPool.Get()
defer conn.Close()
return redis.Bytes(conn.Do("GET", key))
}
func (p *RedisConnPool) GetInt(key string) (int, error) {
conn := p.redisPool.Get()
defer conn.Close()
return redis.Int(conn.Do("GET", key))
}
func (p *RedisConnPool) GetInt64(key string) (int64, error) {
conn := p.redisPool.Get()
defer conn.Close()
return redis.Int64(conn.Do("GET", key))
}
//// Key（键）
func (p *RedisConnPool) DelKey(key string) (interface{}, error) {
conn := p.redisPool.Get()
defer conn.Close()
return conn.Do("DEL", key)
}
func (p *RedisConnPool) ExpireKey(key string, seconds int64) (interface{}, error) {
conn := p.redisPool.Get()
defer conn.Close()
return conn.Do("EXPIRE", key, seconds)
}
func (p *RedisConnPool) Keys(pattern string) ([]string, error) {
conn := p.redisPool.Get()
defer conn.Close()
return redis.Strings(conn.Do("KEYS", pattern))
}
func (p *RedisConnPool) KeysByteSlices(pattern string) ([][]byte, error) {
conn := p.redisPool.Get()
defer conn.Close()
return redis.ByteSlices(conn.Do("KEYS", pattern))
}
//// Hash（哈希表）
func (p *RedisConnPool) SetHashMap(key string, fieldValue map[string]interface{}) (interface{}, error) {
conn := p.redisPool.Get()
defer conn.Close()
return conn.Do("HMSET", redis.Args{}.Add(key).AddFlat(fieldValue)...)
}
func (p *RedisConnPool) GetHashMapString(key string) (map[string]string, error) {
conn := p.redisPool.Get()
defer conn.Close()
return redis.StringMap(conn.Do("HGETALL", key))
}
func (p *RedisConnPool) GetHashMapInt(key string) (map[string]int, error) {
conn := p.redisPool.Get()
defer conn.Close()
return redis.IntMap(conn.Do("HGETALL", key))
}
func (p *RedisConnPool) GetHashMapInt64(key string) (map[string]int64, error) {
conn := p.redisPool.Get()
defer conn.Close()
return redis.Int64Map(conn.Do("HGETALL", key))
}
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