内容简介:该驱动包没有提供创建PG表结构的函数,因此需要手动创建。SQL文件如下:采用通过
PG驱动库包github.com/lib/pq
该驱动包没有提供创建PG表结构的函数,因此需要手动创建。SQL文件如下:
node_infos.sql
--------------------------- ---postgresql SQL by Chen Jian --------------------------- drop table if exists "node_infos"; CREATE TABLE "node_infos"( "node_name" varchar(45) PRIMARY KEY, "node_ip" varchar(45) NOT NULL, "node_port" varchar(45) NOT NULL, "node_username" varchar(45) NOT NULL, "node_password" varchar(255) NOT NULL ); COMMENT ON COLUMN "node_infos"."node_name" is '节点名称'; COMMENT ON COLUMN "node_infos"."node_ip" is '节点IP地址'; COMMENT ON COLUMN "node_infos"."node_port" is '节点端口号'; COMMENT ON COLUMN "node_infos"."node_username" is '节点用户名'; COMMENT ON COLUMN "node_infos"."node_password" is '节点密码'; INSERT INTO node_infos(node_name, node_ip, node_port, node_username, node_password) VALUES ('chen', '10.16.11.92', '22', 'root', 'xxxx'); INSERT INTO node_infos(node_name, node_ip, node_port, node_username, node_password) VALUES ('jian', '10.16.11.94', '22', 'root', 'xxxx'); INSERT INTO node_infos(node_name, node_ip, node_port, node_username, node_password) VALUES ('blabla', '10.16.11.95', '22', 'root', 'xxxx');
PGs数据库的简单操作
# 进入PG数据库 psql -U postgres # 查看当前数据库: \l; <<'COMMENT' List of databases Name | Owner | Encoding | Collate | Ctype | Access privileges -----------+----------+----------+------------+------------+----------------------- postgres | postgres | UTF8 | en_US.utf8 | en_US.utf8 | template0 | postgres | UTF8 | en_US.utf8 | en_US.utf8 | =c/postgres + | | | | | postgres=CTc/postgres template1 | postgres | UTF8 | en_US.utf8 | en_US.utf8 | =c/postgres + | | | | | postgres=CTc/postgres (3 rows) COMMENT # 链接数据库postgres \c postgres; <<'COMMENT' You are now connected to database "postgres" as user "postgres". COMMENT # 创建表 \i node_infos.sql; # 结果输出 psql:node_infos.sql:4: NOTICE: table "node_infos" does not exist, skipping DROP TABLE CREATE TABLE COMMENT COMMENT COMMENT COMMENT COMMENT INSERT 0 1 INSERT 0 1 INSERT 0 1 # 查看当前表 \dt; <<'COMMENT' List of relations Schema | Name | Type | Owner --------+------------+-------+---------- public | node_infos | table | postgres (1 row) COMMENT # 查看表结构 \d node_infos; <<'COMMENT' Table "public.node_infos" Column | Type | Modifiers ---------------+------------------------+----------- node_name | character varying(45) | not null node_ip | character varying(45) | not null node_port | character varying(45) | not null node_username | character varying(45) | not null node_password | character varying(255) | not null Indexes: "node_infos_pkey" PRIMARY KEY, btree (node_name) COMMENT # 查看表中所有数据 select * from node_infos; <<'COMMENT' node_name | node_ip | node_port | node_username | node_password -----------+-------------+-----------+---------------+--------------- chen | 10.16.11.92 | 22 | root | xxxx jian | 10.16.11.94 | 22 | root | xxxx blabla | 10.16.11.95 | 22 | root | xxxx (3 rows) COMMENT # 删除表 drop table node_infos; <<'COMMENT' DROP TABLE COMMENT # 退出PG数据库 \q;
CRUD代码
package main /* Author: Chen Jian Blog: https://www.o-my-chenjian.com Date: 2018-11-20 */ import ( "fmt" "log" "database/sql" _ "github.com/lib/pq" ) var db *sql.DB var err error // PGs数据库信息 const ( pg_host = "10.16.11.95" pg_port = 5432 pg_user = "postgres" pg_password = "postgres" pg_dbname = "postgres" ) func InsertNodeInfo() error { stmt, err := db.Prepare("INSERT INTO \"node_infos\"(\"node_name\", \"node_ip\", \"node_port\", \"node_username\", \"node_password\") VALUES ($1, $2, $3, $4, $5)") if err != nil { log.Fatal("PG Statements Wrong: ", err) } res, err := stmt.Exec("nicai", "10.51.42.66", "9999", "nicai", "gophdddeer") if err != nil { log.Fatal("PG Statements Exec Wrong: ", err) } id, err := res.RowsAffected() if err != nil { log.Fatal("PG Affecte Wrong: ", err) } fmt.Println(id) return nil } func DeleteNodeInfo() error { stmt, err := db.Prepare("DELETE FROM \"node_infos\" WHERE \"node_name\" = $1") if err != nil { log.Fatal("PG Statements Wrong: ", err) } res, err := stmt.Exec("nicai") if err != nil { log.Fatal("PG Statements Exec Wrong: ", err) } id, err := res.RowsAffected() if err != nil { log.Fatal("PG Affecte Wrong: ", err) } fmt.Println(id) return nil } func SelectAllNodeInfo() error { rows, err := db.Query("SELECT * FROM \"node_infos\"") if err != nil { log.Fatal("PG Statements Wrong: ", err) } for rows.Next() { var nodename string var nodeip string var nodeport string var nodeusername string var nodepassword string if err := rows.Scan(&nodename, &nodeip, &nodeport, &nodeusername, &nodepassword); err != nil { log.Fatal("PG Rows Scan Failed: ", err) } fmt.Printf("node_name = \"%s\", "+ "node_ip = \"%s\", "+ "node_port = \"%s\", "+ "node_username = \"%s\", "+ "node_password = \"%s\"\n", nodename, nodeip, nodeport, nodeusername, nodepassword) } if err := rows.Err(); err != nil { log.Fatal("PG Query Failed: ", err) } rows.Close() db.Close() return nil } func UpdateNodeInfo() error { stmt, err := db.Prepare("UPDATE \"node_infos\" SET \"node_username\" = $1 WHERE \"node_name\" = $2") if err != nil { log.Fatal("PG Statements Wrong: ", err) } res, err := stmt.Exec("blabla", "blabla") if err != nil { log.Fatal("PG Statements Exec Wrong: ", err) } id, err := res.RowsAffected() if err != nil { log.Fatal("PG Affecte Wrong: ", err) } fmt.Println(id) return nil } func main() { // 链接PostgreSQL数据库 log.Println("Connecting PostgreSQL....") psqlInfo := fmt.Sprintf("host=%s port=%d user=%s password=%s dbname=%s sslmode=disable", pg_host, pg_port, pg_user, pg_password, pg_dbname) db, err = sql.Open("postgres", psqlInfo) if err != nil { log.Fatal("Connect PG Failed: ", err) } db.SetMaxOpenConns(2000) db.SetMaxIdleConns(1000) defer db.Close() err = db.Ping() if err != nil { log.Fatal("Ping GP Failed: ", err) } fmt.Println("PG Successfull Connected!") // 插入数据 //err := InsertNodeInfo() //if err != nil { // log.Fatal("Insert Data Failed: ", err) //} // 删除数据 //err := DeleteNodeInfo() //if err != nil { // log.Fatal("Delete Data Failed: ", err) //} // 查询所有数据 //err := SelectAllNodeInfo() //if err != nil { // log.Fatal("Select All Data Failed: ", err) //} // 更新某一数据 err := UpdateNodeInfo() if err != nil { log.Fatal("Update Data Failed: ", err) } }
PG驱动库包github.com/lib/pq
采用 github.com/lib/pq
主要是其提供创建数据库表的方法。
package main /* Author: Chen Jian Blog: https://www.o-my-chenjian.com Date: 2018-11-20 */ import ( "fmt" "log" "github.com/go-pg/pg" "github.com/go-pg/pg/orm" ) // PGs数据库信息 const ( pg_addr = "10.16.11.95:5432" pg_user = "postgres" pg_password = "postgres" pg_dbname = "postgres" ) // 定义表结构 type NodeInfo struct { NodeName string `sql:"type:varchar(45),unique,notnull,pk"` NodeIp string `sql:"type:varchar(45),notnull"` NodePort string `sql:"type:varchar(45),notnull"` NodeUsername string `sql:"type:varchar(45),notnull"` NodePassword string `sql:"type:varchar(255),notnull"` } func CreateTable(db *pg.DB) error { for _, model := range []interface{}{(*NodeInfo)(nil)} { err := db.CreateTable(model, &orm.CreateTableOptions{ IfNotExists: true, FKConstraints: true, }) if err != nil { return err } } return nil } func DeleteTable(db *pg.DB) error { err := db.DropTable(&NodeInfo{}, &orm.DropTableOptions{ IfExists: true, Cascade: true, }) return err } func InsertNodeInfo(db *pg.DB) error { // 插入数据方法一 //nodeinfodata := &NodeInfo{ // NodeName: "chenjian", // NodeIp: "10.0.0.5", // NodePort: "2222", // NodeUsername: "chenjian", // NodePassword: "1234321", //} //err := db.Insert(nodeinfodata) //if err!=nil { // return err //} // 插入数据方法二 err := db.Insert(&NodeInfo{ NodeName: "chenjian", NodeIp: "10.0.0.5", NodePort: "2222", NodeUsername: "chenjian", NodePassword: "1234321", }) if err != nil { return err } return nil } func SelectAllNodeInfo(db *pg.DB) error { var nodeinfodata []NodeInfo err := db.Model(&nodeinfodata).Select() if err != nil { return err } fmt.Println(nodeinfodata) return nil } func SelectNodeInfo(db *pg.DB) error { nodeinfodata := &NodeInfo{ NodeName: "chenjian", } err := db.Select(nodeinfodata) if err != nil { return err } fmt.Println(nodeinfodata) return nil } func UpdateNodeInfo(db *pg.DB) error { var nodeinfodata []NodeInfo updatedata := &NodeInfo{ NodeName: "chenjian", NodeIp: "10.0.0.5", NodePort: "3333", NodeUsername: "chenjian", NodePassword: "1234321", } _, err := db.Model(&nodeinfodata). Set("node_port = ?", updatedata.NodePort). Where("node_name = ?", updatedata.NodeName). Returning("*"). Update() if err != nil { return err } return nil } func main() { // 链接PostgreSQL数据库 log.Println("Connecting PostgreSQL....") db := pg.Connect(&pg.Options{ Addr: pg_addr, User: pg_user, Password: pg_password, Database: pg_dbname, }) defer db.Close() fmt.Println("Successfull Connected!") // 创建表 //err := CreateTable(db) //if err != nil { // log.Fatal("Create Table Failed: ",err) //} // 删除表 //err := DeleteTable(db) //if err != nil { // log.Fatal("Delete Table Failed: ", err) //} // 插入数据 //err := InsertNodeInfo(db) //if err != nil { // log.Fatal("Insert Data Failed: ", err) //} // 查询所有数据 //err := SelectAllNodeInfo(db) //if err != nil { // log.Fatal("Select All Data Failed: ", err) //} // 查询某一数据 //err := SelectNodeInfo(db) //if err != nil { // log.Fatal("Select Data Failed: ", err) //} // 更新某一数据 err := UpdateNodeInfo(db) if err != nil { log.Fatal("Update Data Failed: ", err) } }
govendor依赖管理工具
通过 govendor
可以很方便的管理项目中所有的依赖包。例如将依赖包放到项目路径下,便于项目的传递,从而不需再一次下载依赖包。
govendor的安装
go get -u github.com/kardianos/govendor # 无法下载成功,可以下载源码,进行编译 mkdir -p ${GOPATH}/src/github.com/kardianos cd ${GOPATH}/src/github.com/kardianos git clone https://github.com/kardianos/govendor.git govendor
govendor的操作
# 进入项目路径 cd ${GOPATH}/src/chenjian # 初始化govendor。随后会生成一个vender文件夹,里面有个vender.json,记录着依赖包的信息 govendor init # 查看项目中所需依赖列表,状态内容如下 govendor list # 查看正在使用的依赖包 govendor list -v fmt # 下载missing的依赖包,下载完后,+missing变为+external状态 govendor get k8s.io/klog # 下载特定版本的依赖包 govendor fetch golang.org/x/net/[email protected] # Get latest v1.*.* tag or branch. govendor fetch golang.org/x/net/[email protected] # Get the tag or branch named "v1". govendor fetch golang.org/x/net/[email protected]=v1 # 将+external状态的依赖包归到govender管理 govendor add k8s.io/klog # 批量add govendor add +e
- vender.json
{ "comment": "", "ignore": "test", "package": [ { "checksumSHA1": "asksIwylfIjaYsF2nMY69jTyxC0=", "path": "github.com/lib/pq", "revision": "9eb73efc1fcc404148b56765b0d3f61d9a5ef8ee", "revisionTime": "2018-10-16T16:26:27Z" } ], "rootPath": "chenjian" }
- 依赖包状态
状态 | 缩写 | 含义 |
---|---|---|
+local | l | 在项目中的包 |
+external | e | 外部包,即被 $GOPATH 管理,但不在 vendor 目录下 |
+vendor | v | 已被 govendor 管理,即在 vendor 目录下 |
+std | s | 标准库中的包 |
+unused | u | 未使用的包,即包在 vendor 目录下,但项目并没有用到 |
+missing | m | 代码引用了依赖包,但该包并没有找到 |
+program | p | 主程序包,意味着可以编译为执行文件 |
+outside | 外部包和缺失的包 | |
+all | 所有的包 |
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