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+# Application Access Guide
+
+>In [Quick Start](01-quickstart.en.md) article, we introduced opentenbase architecture, source code compilation and installation, cluster running status, startup and stop, etc.
+>
+>This chapter will introduce how to connect to OpenTenBase for create database, table, data import, query and other operations.
+
+OpenTenBase is compatible with all clients that support the Postgres protocol. Now we introduce the commonly used development languages including JAVA, C, shell, python, PHP, golang for connect to OpenTenBase.
+
+## 1、JAVA
+### 1.1、Create Table
+
+```
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.Statement;
+ 
+ 
+public class createtable {
+   public static void main( String args[] )
+     {
+       Connection c = null;
+       Statement stmt = null;
+       try {
+         Class.forName("org.postgresql.Driver");
+         c = DriverManager.getConnection("jdbc:postgresql://127.0.0.1:15432/postgres?currentSchema=public&binaryTransfer=false","opentenbase", "opentenbase");
+         System.out.println("Opened database successfully");
+         stmt = c.createStatement();
+         String sql = "create table opentenbase(id int,nickname text) distribute by shard(id) to group  default_group" ;
+         stmt.executeUpdate(sql);
+         stmt.close();
+         c.close();
+       } catch ( Exception e ) {
+         System.err.println( e.getClass().getName()+": "+ e.getMessage() );
+         System.exit(0);
+       }
+       System.out.println("Table created successfully");
+     }
+}
+```
+Explain： 
+
+* The node in here is an arbitrary CN master node. All subsequent operations, unless otherwise specified, are performed by connecting to the CN master node.
+
+
+
+### 1.2、Insert data use general protocol
+```
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.Statement;
+ 
+public class insert {
+   public static void main(String args[]) {
+      Connection c = null;
+      Statement stmt = null;
+      try {
+         Class.forName("org.postgresql.Driver");
+         c = DriverManager.getConnection("jdbc:postgresql://127.0.0.1:15432/postgres?currentSchema=public&binaryTransfer=false","opentenbase", "opentenbase");
+         c.setAutoCommit(false);
+         System.out.println("Opened database successfully");
+ 
+         stmt = c.createStatement();
+         String sql = "INSERT INTO opentenbase (id,nickname) "
+               + "VALUES (1,'opentenbase');";
+         stmt.executeUpdate(sql);
+ 
+         sql = "INSERT INTO opentenbase (id,nickname) "
+               + "VALUES (2, 'pgxz' ),(3,'pgxc');";
+         stmt.executeUpdate(sql);
+         stmt.close();
+         c.commit();
+         c.close();
+      } catch (Exception e) {
+         System.err.println( e.getClass().getName()+": "+ e.getMessage() );
+         System.exit(0);
+      }
+      System.out.println("Records created successfully");
+   }
+}
+```
+### 1.3、Insert data use extended protocol
+```
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.*;
+import java.util.Random;
+ 
+public class insert_prepared {
+   public static void main(String args[]) {
+      Connection c = null;
+      PreparedStatement stmt;
+      try {
+         Class.forName("org.postgresql.Driver");
+         c = DriverManager.getConnection("jdbc:postgresql://127.0.0.1:15432/postgres?currentSchema=public&binaryTransfer=false","opentenbase", "opentenbase");
+         c.setAutoCommit(false);
+         System.out.println("Opened database successfully");
+         //Insert data
+         String sql = "INSERT INTO opentenbase (id,nickname) VALUES (?,?)";         
+         stmt = c.prepareStatement(sql);
+         stmt.setInt(1, 9999);
+         stmt.setString(2, "opentenbase_prepared");
+         stmt.executeUpdate();
+         
+         //Insert update
+         sql = "INSERT INTO opentenbase (id,nickname) VALUES (?,?) ON CONFLICT(id) DO UPDATE SET nickname=?";
+         stmt = c.prepareStatement(sql);
+         stmt.setInt(1, 9999);
+         stmt.setString(2, "opentenbase_prepared");
+         stmt.setString(3, "opentenbase_prepared_update");
+         stmt.executeUpdate();
+        
+         stmt.close();
+         c.commit();
+         c.close();
+      } catch (Exception e) {
+         System.err.println( e.getClass().getName()+": "+ e.getMessage() );
+         System.exit(0);
+      }
+      System.out.println("Records created successfully");
+   }
+}
+```
+### 1.4、Use `copy from` load file to table 
+```
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.Statement;
+import org.postgresql.copy.CopyManager;  
+import org.postgresql.core.BaseConnection;  
+import java.io.*;
+ 
+public class copyfrom {
+   public static void main( String args[] )
+     {
+       Connection c = null;
+       Statement stmt = null;
+       FileInputStream fs = null;
+       try {
+         Class.forName("org.postgresql.Driver");
+         c = DriverManager.getConnection("jdbc:postgresql://127.0.0.1:15432/postgres?currentSchema=public&binaryTransfer=false","opentenbase", "opentenbase");
+         System.out.println("Opened database successfully");
+         CopyManager cm = new CopyManager((BaseConnection) c);
+         fs = new FileInputStream("/data/opentenbase/opentenbase.csv");
+         String sql = "COPY opentenbase FROM STDIN DELIMITER AS ','";
+         cm.copyIn(sql, fs);
+         c.close();
+         fs.close();
+       } catch ( Exception e ) {
+         System.err.println( e.getClass().getName()+": "+ e.getMessage() );
+         System.exit(0);
+       }
+       System.out.println("Copy data successfully");
+     }
+}
+```
+### 1.5、Use `copy to` export data to file  
+```
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.Statement;
+import org.postgresql.copy.CopyManager;  
+import org.postgresql.core.BaseConnection;  
+import java.io.*;
+ 
+public class copyto {
+   public static void main( String args[] )
+     {
+       Connection c = null;
+       Statement stmt = null;
+       FileOutputStream fs = null;
+       try {
+         Class.forName("org.postgresql.Driver");
+         c = DriverManager.getConnection("jdbc:postgresql://127.0.0.1:15432/postgres?currentSchema=public&binaryTransfer=false","opentenbase", "opentenbase");
+         System.out.println("Opened database successfully");
+         CopyManager cm = new CopyManager((BaseConnection) c);
+         fs = new FileOutputStream("/data/opentenbase/opentenbase.csv");
+         String sql = "COPY opentenbase TO STDOUT DELIMITER AS ','";
+         cm.copyOut(sql, fs);
+         c.close();
+         fs.close();
+       } catch ( Exception e ) {
+         System.err.println( e.getClass().getName()+": "+ e.getMessage() );
+         System.exit(0);
+       }
+       System.out.println("Copy data successfully");
+     }
+}
+```
+### 1.6、Download address for jdbc file
+```
+https://jdbc.postgresql.org/download.html
+```
+
+## 2、C  
+### 2.1、Connect to database
+```
+#include <stdio.h>  
+#include <stdlib.h>  
+#include "libpq-fe.h"     
+int
+main(int argc, char **argv){
+    const char *conninfo;
+    PGconn     *conn;      
+    if (argc > 1){
+        conninfo = argv[1];
+    }else{
+        conninfo = "dbname = postgres";  
+    }            
+    conn = PQconnectdb(conninfo);
+    if (PQstatus(conn) != CONNECTION_OK){
+        fprintf(stderr, "Failed to connect to the database: %s",PQerrorMessage(conn));              
+    }else{
+        printf("Connected to database successful！\n");
+    }
+    PQfinish(conn);
+    return 0;
+}
+```  
+
+Compile    
+
+```
+gcc -c -I /usr/local/install/opentenbase_pgxz/include/ conn.c  
+gcc -o conn conn.o -L /usr/local/install/opentenbase_pgxz/lib/ -lpq  
+```   
+
+Run  
+  
+``` 
+./conn "host=172.16.0.3 dbname=postgres port=11000"  
+Connected to database successful！
+```  
+  
+```
+./conn "host=172.16.0.3 dbname=postgres port=15432 user=opentenbase"   
+Connected to database successful！ 
+```   
+ 
+### 2.2、Create table
+```
+#include <stdio.h>
+#include <stdlib.h>
+#include "libpq-fe.h"   
+int
+main(int argc, char **argv){
+    const char *conninfo;
+    PGconn     *conn;      
+    PGresult   *res;
+    const char *sql = "create table opentenbase(id int,nickname text) distribute by shard(id) to group  default_group";
+    if (argc > 1){
+        conninfo = argv[1];
+    }else{
+        conninfo = "dbname = postgres";           
+    }        
+    conn = PQconnectdb(conninfo);
+    if (PQstatus(conn) != CONNECTION_OK){
+        fprintf(stderr, "Failed to connect to the database: %s",PQerrorMessage(conn));              
+    }else{
+        printf("Connected to database successful！\n");
+    }
+    res = PQexec(conn,sql);
+    if(PQresultStatus(res) != PGRES_COMMAND_OK){
+        fprintf(stderr, "Failed to create data table: %s",PQresultErrorMessage(res)); 
+    }else{
+        printf("Create data table successful！\n");
+    }
+    PQclear(res);
+    PQfinish(conn);
+    return 0;
+}
+``` 
+Compile  
+
+``` 
+gcc -c -I /usr/local/install/opentenbase_pgxz/include/ createtable.c  
+gcc -o createtable createtable.o -L /usr/local/install/opentenbase_pgxz/lib/ -lpq  
+```   
+Run  
+
+```
+./createtable "port=11000 dbname=postgres"
+Connected to database successful！  
+Create data table successful！ 
+```  
+
+
+### 2.3、Insert data
+```
+#include <stdio.h>
+#include <stdlib.h>
+#include "libpq-fe.h"   
+int
+main(int argc, char **argv){
+    const char *conninfo;
+    PGconn     *conn;      
+    PGresult   *res;
+    const char *sql = "INSERT INTO opentenbase (id,nickname) values(1,'opentenbase'),(2,'pgxz')";
+    if (argc > 1){
+        conninfo = argv[1];
+    }else{
+        conninfo = "dbname = postgres";           
+    }        
+    conn = PQconnectdb(conninfo);
+    if (PQstatus(conn) != CONNECTION_OK){
+        fprintf(stderr, "Failed to connect to the database: %s",PQerrorMessage(conn));              
+    }else{
+        printf("Create data table successful！\n");
+    }
+    res = PQexec(conn,sql);
+    if(PQresultStatus(res) != PGRES_COMMAND_OK){
+        fprintf(stderr, "Insert data failed: %s",PQresultErrorMessage(res)); 
+    }else{
+        printf("Insert data successful！\n");
+    }
+    PQclear(res);
+    PQfinish(conn);
+    return 0;
+}
+``` 
+Compile  
+
+``` 
+gcc -c -I /usr/local/install/opentenbase_pgxz/include/ insert.c
+gcc -o insert insert.o -L /usr/local/install/opentenbase_pgxz/lib/ -lpq
+```   
+Run  
+
+```
+./insert "dbname=postgres port=15432"
+```  
+  
+
+### 2.4、Query data
+```
+#include <stdio.h>
+#include <stdlib.h>
+#include "libpq-fe.h"   
+int
+main(int argc, char **argv){
+    const char *conninfo;
+    PGconn     *conn;      
+    PGresult   *res;
+    const char *sql = "select * from opentenbase";
+    if (argc > 1){
+        conninfo = argv[1];
+    }else{
+        conninfo = "dbname = postgres";           
+    }
+    conn = PQconnectdb(conninfo);    
+    if (PQstatus(conn) != CONNECTION_OK){
+        fprintf(stderr, "Failed to connect to the database: %s",PQerrorMessage(conn));              
+    }else{    
+        printf("Connected to database successful！\n");
+    }                                
+    res = PQexec(conn,sql);
+    if(PQresultStatus(res) != PGRES_TUPLES_OK){
+        fprintf(stderr, "Insert data failed: %s",PQresultErrorMessage(res)); 
+    }else{
+        printf("Query data successful！\n");    
+        int rownum = PQntuples(res) ;
+        int colnum = PQnfields(res);
+        for(int j = 0;j< colnum; ++j){
+            printf("%s\t",PQfname(res,j));
+        }
+        printf("\n");
+        for(int i = 0;i< rownum; ++i){
+            for(int j = 0;j< colnum; ++j){
+                printf("%s\t",PQgetvalue(res,i,j));
+            }
+            printf("\n");
+        }
+    }
+    PQclear(res);
+    PQfinish(conn);
+    return 0;
+}
+```
+ 
+Compile  
+
+``` 
+gcc -std=c99 -c -I /usr/local/install/opentenbase_pgxz/include/ select.c  
+gcc -o select select.o -L /usr/local/install/opentenbase_pgxz/lib/ -lpq
+```     
+Run 
+ 
+``` 
+./select "dbname=postgres port=15432"
+Connected to database successful！  
+Query data successful！ 
+id      nickname  
+1       opentenbase  
+2       pgxz  
+
+```
+
+### 2.5、Copy Stream data into table
+```
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include "libpq-fe.h"   
+int 
+main(int argc, char **argv){
+    const char *conninfo;
+    PGconn     *conn;      
+    PGresult   *res;
+    const char *buffer = "1,opentenbase\n2,pgxz\n3,opentenbase牛";
+    if (argc > 1){
+        conninfo = argv[1];
+    }else{
+        conninfo = "dbname = postgres";           
+    }
+    conn = PQconnectdb(conninfo);
+    if (PQstatus(conn) != CONNECTION_OK){
+        fprintf(stderr, "Failed to connect to the database: %s",PQerrorMessage(conn));              
+    }else{
+        printf("Connected to database successful！\n");
+    }
+    res=PQexec(conn,"COPY opentenbase FROM STDIN DELIMITER ',';");
+    if(PQresultStatus(res) != PGRES_COPY_IN){
+        fprintf(stderr, "Wrong from copy data 1: %s",PQresultErrorMessage(res));
+    }else{
+        int len = strlen(buffer);
+        if(PQputCopyData(conn,buffer,len) == 1){
+             if(PQputCopyEnd(conn,NULL) == 1){
+                res = PQgetResult(conn);
+                if(PQresultStatus(res) == PGRES_COMMAND_OK){
+                    printf("Copy data successful！\n");         
+                }else{
+                    fprintf(stderr, "Wrong from copy data 2: %s",PQerrorMessage(conn));    
+                }
+             }else{
+                fprintf(stderr, "Wrong from copy data 3: %s",PQerrorMessage(conn));   
+             }
+        }else{
+            fprintf(stderr, "Wrong from copy data 4: %s",PQerrorMessage(conn));              
+        }
+    }
+    PQclear(res);
+    PQfinish(conn);
+    return 0;
+}
+```
+ 
+Compile  
+
+``` 
+gcc -c -I /usr/local/install/opentenbase_pgxz/include/ copy.c
+gcc -o copy copy.o -L /usr/local/install/opentenbase_pgxz/lib/ -lpq
+```
+ 
+Run  
+
+``` 
+./copy "dbname=postgres port=15432"
+Connected to database successful！ 
+Copy data successful！
+```  
+
+
+
+### 3、Shell script
+```
+#!/bin/sh
+ 
+if [ $# -ne 0 ]
+then
+    echo "usage: $0 exec_sql"
+    exit 1
+fi
+ 
+exec_sql=$1
+ 
+masters=`psql -h 172.16.0.29 -d postgres -p 15432 -t -c "select string_agg(node_host, ' ') from (select * from pgxc_node where node_type = 'D' order by node_name) t"`
+port_list=`psql -h 172.16.0.29 -d postgres -p 15432 -t -c "select string_agg(node_port::text, ' ') from (select * from pgxc_node where node_type = 'D' order by node_name) t"`
+node_cnt=`psql -h 172.16.0.29 -d postgres -p 15432 -t -c "select count(*) from pgxc_node where node_type = 'D'"`
+masters=($masters)
+ports=($port_list)
+ 
+echo $node_cnt
+ 
+flag=0
+ 
+for((i=0;i<$node_cnt;i++));
+do
+    seq=$(($i+1))
+    master=${masters[$i]}
+    port=${ports[$i]}
+    echo $master
+    echo $port
+ 
+    psql -h $master -p $port  postgres -c "$exec_sql"
+done
+```
+
+## 4、Python
+### 4.1、Install psycopg2
+```
+[root@VM_0_29_centos ~]# yum install python-psycopg2
+```  
+
+### 4.2、Connect database
+```
+#coding=utf-8
+#!/usr/bin/python
+import psycopg2
+try:
+    conn = psycopg2.connect(database="postgres", user="opentenbase", password="", host="172.16.0.29", port="15432")
+    print "Connected to database successful！"
+    conn.close()
+except psycopg2.Error,msg:
+    print "Failed to connect database, details： %s" %(msg.args[0])
+```
+ 
+Run  
+
+``` 
+[opentenbase@VM_0_29_centos python]$ python conn.py 
+Connected to database successful！  
+```
+
+
+### 4.3、Create table
+```
+#coding=utf-8
+#!/usr/bin/python
+import psycopg2
+try:
+    conn = psycopg2.connect(database="postgres", user="opentenbase", password="", host="172.16.0.29", port="15432")
+    print "Connected to database successful！"
+    cur = conn.cursor()
+    sql = """
+          create table opentenbase 
+          (
+              id int,
+              nickname varchar(100)
+          )distribute by shard(id) to group default_group
+          """
+    cur.execute(sql)
+    conn.commit()
+    print "Create table successful!"    
+    conn.close()
+except psycopg2.Error,msg:
+    print "OpenTenBase Error %s" %(msg.args[0])
+``` 
+Run  
+
+``` 
+[opentenbase@VM_0_29_centos python]$ python createtable.py   
+Connected to database successful！ 
+Create table successful!
+```
+### 4.4、Insert data
+```
+#coding=utf-8
+#!/usr/bin/python
+import psycopg2
+try:
+    conn = psycopg2.connect(database="postgres", user="opentenbase", password="", host="172.16.0.29", port="15432")
+    print "Connected to database successful!"    
+    cur = conn.cursor()
+    sql = "insert into opentenbase values(1,'opentenbase'),(2,'opentenbase');"
+    cur.execute(sql)
+    sql = "insert into opentenbase values(%s,%s)"   
+    cur.execute(sql,(3,'pg'))
+    conn.commit()
+    print "Insert data successful!"    
+    conn.close()
+except psycopg2.Error,msg:
+    print "OpenTenBase Error %s" %(msg.args[0])
+``` 
+Run  
+
+``` 
+[opentenbase@VM_0_29_centos python]$ python insert.py   
+Connected to database successful！  
+Insert data successful! 
+```
+
+### 4.5、Query data
+```
+#coding=utf-8
+#!/usr/bin/python
+import psycopg2
+try:
+    conn = psycopg2.connect(database="postgres", user="opentenbase", password="", host="172.16.0.29", port="15432")
+    print "Connected to database successful!"    
+    cur = conn.cursor()
+    sql = "select * from opentenbase"
+    cur.execute(sql)
+    rows = cur.fetchall()
+    for row in rows:
+        print "ID = ", row[0]
+        print "NICKNAME = ", row[1],"\n"
+    conn.close()
+except psycopg2.Error,msg:
+    print "OpenTenBase Error %s" %(msg.args[0])
+```
+ 
+Run  
+
+``` 
+[opentenbase@VM_0_29_centos python]$ python select.py   
+Connected to database successful！
+ID =  1
+NICKNAME =  opentenbase 
+ 
+ID =  2
+NICKNAME =  pgxz 
+ 
+ID =  3
+NICKNAME =  pg
+```  
+ 
+### 4.6、Use `copy from` load file to table
+```
+#coding=utf-8
+#!/usr/bin/python
+import psycopg2
+try:
+    conn = psycopg2.connect(database="postgres", user="opentenbase", password="", host="172.16.0.29", port="15432")
+    print "Connected to database successful！"    
+    cur = conn.cursor()
+    filename = "/data/opentenbase/opentenbase.txt"
+    cols = ('id','nickname')
+    tablename="public.opentenbase"
+    cur.copy_from(file=open(filename),table=tablename,columns=cols,sep=',')
+    conn.commit()
+    print "Import data successful!"
+    conn.close()
+except psycopg2.Error,msg:
+    print "OpenTenBase Error %s" %(msg.args[0])
+```  
+ 
+Run
+
+``` 
+[opentenbase@VM_0_29_centos python]$ python copy_from.py 
+Connected to database successful！ 
+Import data successful!
+``` 
+
+## 5、PHP
+### 5.1、Connect database
+```
+<?php     
+$host="172.16.0.29";
+$port="15432";
+$dbname="postgres";
+$user="opentenbase" ;
+$password="";  
+ 
+//Connect database
+$conn=@pg_connect("host=$host port=$port dbname=$dbname user=$user password=$password");      
+if (!$conn){
+    $error_msg=@pg_errormessage($conn); 
+    echo "Failed to connect database，details：".$error_msg."\n<BR>"; ;
+    exit;
+}else{
+    echo "Connected to database successful!"\n<BR>";      
+} 
+//Close connect
+pg_close($conn);
+?>
+``` 
+ 
+Run  
+
+``` 
+[root@VM_0_47_centos test]# curl http://127.0.0.1:8080/dbsta/test/conn.php
+Connected to database successful!
+```  
+
+### 5.2、Create table
+```
+<?php     
+$host="172.16.0.29";
+$port="15432";
+$dbname="postgres";
+$user="opentenbase" ;
+$password="";  
+ 
+//Connect database
+$conn=@pg_connect("host=$host port=$port dbname=$dbname user=$user password=$password");      
+if (!$conn){
+    $error_msg=@pg_errormessage($conn); 
+    echo "Failed to connect database，details：".$error_msg."\n<BR>"; ;
+    exit;
+}else{
+    echo "Connected to database successful!"\n<BR>";      
+} 
+ 
+//Create table
+$sql="create table public.opentenbase(id integer,nickname varchar(100)) distribute by shard(id) to group default_group;";
+$result = @pg_exec($conn,$sql) ;
+if (!$result){
+    $error_msg=@pg_errormessage($conn); 
+    echo "Failed to create table，details：".$error_msg."\n"; ;
+    exit;
+}else{
+    echo "Creat table successful!"\n";       
+}
+//Close connect
+pg_close($conn);
+?>
+```  
+
+run
+
+``` 
+[root@VM_0_47_centos test]# curl http://127.0.0.1:8080/dbsta/test/createtable.php
+Connected to database successful!
+Creat table successful!
+```
+
+### 5.3、Insert data
+```
+<?php     
+$host="172.16.0.29";
+$port="15432";
+$dbname="postgres";
+$user="opentenbase" ;
+$password="";  
+ 
+//Connect database
+$conn=@pg_connect("host=$host port=$port dbname=$dbname user=$user password=$password");      
+if (!$conn){
+    $error_msg=@pg_errormessage($conn); 
+    echo "Failed to connect database，details：".$error_msg."\n"; ;
+    exit;
+}else{
+    echo "Connected to database successful!"\n";      
+} 
+ 
+//Insert data
+$sql="insert into public.opentenbase values(1,'opentenbase'),(2,'pgxz');";    
+$result = @pg_exec($conn,$sql) ;
+if (!$result){
+    $error_msg=@pg_errormessage($conn); 
+    echo "Failed to insert data, details：".$error_msg."\n";
+    exit;
+}else{
+    echo "Insert data successful!"\n";       
+}
+ 
+//Close connect
+pg_close($conn);
+ 
+?>
+```  
+ 
+Run
+
+``` 
+[opentenbase@VM_0_47_centos test]$ curl http://127.0.0.1:8080/dbsta/test/insert.php
+Connected to database successful!
+Insert data successful!
+```
+
+### 5.4、Query data
+```
+<?php     
+$host="172.16.0.29";
+$port="15432";
+$dbname="postgres";
+$user="opentenbase" ;
+$password="";  
+ 
+//Connect database
+$conn=@pg_connect("host=$host port=$port dbname=$dbname user=$user password=$password");      
+if (!$conn){
+    $error_msg=@pg_errormessage($conn); 
+    echo "Failed to connect database，details: ".$error_msg."\n"; ;
+    exit;
+}else{
+    echo "Connected to database successful!"\n";      
+} 
+ 
+//Query data
+$sql="select id,nickname from public.opentenbase";    
+$result = @pg_exec($conn,$sql) ;
+if (!$result){
+    $error_msg=@pg_errormessage($conn); 
+    echo "Failed to query data, details ：".$error_msg."\n";
+    exit;
+}else{
+    echo "Query data successful!"\n";      
+}
+$record_num = pg_numrows($result);  
+echo "Return query number: ".$record_num."\n"; 
+$rec=pg_fetch_all($result); 
+for($i=0;$i<$record_num;$i++){
+    echo "numbers: #".strval($i+1)."\n";
+    echo "id：".$rec[$i]["id"]."\n";
+    echo "nickname：".$rec[$i]["nickname"]."\n\n";
+}
+//CLose connect 
+pg_close($conn);
+?>
+``` 
+Use method  
+
+``` 
+[root@VM_0_47_centos ~]# curl http://127.0.0.1:8080/dbsta/test/select.php
+Connected to database successful!
+Query data successful!
+Return query number: 2
+numbers: 1
+id：1
+nickname：opentenbase
+ 
+numbers: 2
+id：2
+nickname：pgxz
+```  
+
+### 5.5、Copy Stream data into table
+```
+<?php 
+ 
+$host="172.16.0.29";
+$port="15432";
+$dbname="postgres";
+$user="opentenbase" ;
+$password="";  
+ 
+//Connect database
+$conn=@pg_connect("host=$host port=$port dbname=$dbname user=$user password=$password");      
+if (!$conn){
+    $error_msg=@pg_errormessage($conn); 
+    echo "Failed to connect database，details: ".$error_msg."\n"; ;
+    exit;
+}else{
+    echo "Connected to database successful!"\n";      
+}                                     
+$row=ARRAY("1,opentenbase","2,pgxz");   
+$flag=pg_copy_from($conn,"public.opentenbase",$row,",");
+ 
+if (!$flag){
+    $error_msg=@pg_errormessage($conn); 
+    echo "copy wrong，details：".$error_msg."\n";
+}else{
+    echo "copy successful!"\n";          
+}
+ 
+//Close connect
+pg_close($conn);
+        
+?>
+```  
+ 
+Use method
+
+``` 
+curl http://127.0.0.1/dbsta/cron/php_copy_from.php
+Connected to database successful!
+copy successful!
+```  
+
+### 5.6、Export data to Array
+```
+<?php 
+ 
+$host="172.16.0.29";
+$port="15432";
+$dbname="postgres";
+$user="opentenbase" ;
+$password="";  
+ 
+//Connect database
+$conn=@pg_connect("host=$host port=$port dbname=$dbname user=$user password=$password");      
+if (!$conn){
+    $error_msg=@pg_errormessage($conn); 
+    echo "Failed to connect database，details: ".$error_msg."\n"; ;
+    exit;
+}else{
+    echo "Connected to database successful!"\n";      
+}                                    
+ 
+$row=pg_copy_to($conn,"public.opentenbase",",");  
+if (!$row){
+    $error_msg=@pg_errormessage($conn); 
+    echo "copy wrong，details：".$error_msg."\n";
+}else{
+    print_r($row);
+}  
+//Close connect 
+pg_close($conn);              
+?>
+``` 
+ 
+Use method 
+
+```
+curl http://127.0.0.1/dbsta/cron/php_copy_to.php  
+Connected to database successful!
+Array
+(
+    [0] => 1,opentenbase
+ 
+    [1] => 2,pgxz
+ 
+)
+```  
+
+## 6、golang 
+### 6.1、Connect database
+```
+package main
+ 
+import (
+    "fmt"
+    "time"
+ 
+    "github.com/jackc/pgx"
+)
+ 
+func main() {
+    var error_msg string
+ 
+    //Connect database
+    conn, err := db_connect()
+    if err != nil {
+        error_msg = "Failed to connect database, details：" + err.Error()
+        write_log("Error", error_msg)
+        return
+    }
+    //Close connect
+    defer conn.Close()
+    write_log("Log", "Connected to database successful！")
+ 
+}
+ 
+/*
+Function：write to log
+ 
+Parameter：
+log_level -- level of log，only `Error` or `Log`
+error_msg -- content of log
+ 
+Return：none
+*/
+ 
+func write_log(log_level string, error_msg string) {
+    //print error message
+    fmt.Println("Time：", time.Now().Format("2006-01-02 15:04:05"))
+    fmt.Println("Log level：", log_level)
+    fmt.Println("Details：", error_msg)
+}
+ 
+/*
+Function：Connect database
+ 
+Parameter：none
+ 
+Return：
+conn *pgx.Conn -- connection information
+err error -- error message
+ 
+*/
+ 
+func db_connect() (conn *pgx.Conn, err error) {
+    var config pgx.ConnConfig
+    config.Host = "127.0.0.1"    //localhost or ip
+    config.User = "opentenbase"         //username
+    config.Password = "pgsql"    //password
+    config.Database = "postgres" //database name
+    config.Port = 15432          //port
+    conn, err = pgx.Connect(config)
+    return conn, err
+}
+```
+  
+```  
+[root@VM_0_29_centos opentenbase]# go run conn.go 
+Time： 2018-04-03 20:40:28
+Log level： Log
+Details： Connected to database successful！
+```  
+ 
+Compile And Run  
+
+```
+[root@VM_0_29_centos opentenbase]# go build conn.go 
+[root@VM_0_29_centos opentenbase]# ./conn 
+Time： 2018-04-03 20:40:48
+Log level： Log
+Details： Connected to database successful！
+```  
+
+### 6.2、Create table  
+```
+package main
+ 
+import (
+    "fmt"
+    "time"
+ 
+    "github.com/jackc/pgx"
+)
+ 
+func main() {
+    var error_msg string
+    var sql string
+ 
+    //Connect database
+    conn, err := db_connect()
+    if err != nil {
+        error_msg = "Failed to connect database，details: " + err.Error()
+        write_log("Error", error_msg)
+        return
+    }
+    //Close connection
+    defer conn.Close()
+    write_log("Log", "Connected to database successful!")
+ 
+    //Create table
+    sql = "create table public.opentenbase(id varchar(20),nickname varchar(100)) distribute by shard(id) to group  default_group;"
+    _, err = conn.Exec(sql)
+    if err != nil {
+        error_msg = "Failed to create table: " + err.Error()
+        write_log("Error", error_msg)
+        return
+    } else {
+        write_log("Log", "Create table successful!")
+    }
+}
+ 
+/*
+Function： Write log process
+ 
+Parameter：
+log_level -- level of log，only `Error` or `Log`
+error_msg -- content of log
+ 
+Return：none
+*/
+ 
+func write_log(log_level string, error_msg string) {
+    //print error message
+    fmt.Println("Time：", time.Now().Format("2006-01-02 15:04:05"))
+    fmt.Println("Log level：", log_level)
+    fmt.Println("Details：", error_msg)
+}
+ 
+/*
+Function：Connect database
+ 
+Parameter：none
+ 
+Return：
+conn *pgx.Conn -- connection information
+err error -- error message
+ 
+*/
+ 
+func db_connect() (conn *pgx.Conn, err error) {
+    var config pgx.ConnConfig
+    config.Host = "127.0.0.1"    //localhost or ip
+    config.User = "opentenbase"         //username
+    config.Password = "pgsql"    //password
+    config.Database = "postgres" //database name
+    config.Port = 15432          //port
+    conn, err = pgx.Connect(config)
+    return conn, err
+}
+```  
+
+``` 
+[root@VM_0_29_centos opentenbase]# go run createtable.go 
+Time： 2018-04-03 20:50:24
+Log level： Log
+Details： Connected to database successful！
+Time： 2018-04-03 20:50:24
+Log level： Log
+Details： Create table successful!
+```  
+
+### 6.3、Insert data
+```
+package main
+ 
+import (
+    "fmt"
+    "strings"
+    "time"
+ 
+    "github.com/jackc/pgx"
+)
+ 
+func main() {
+    var error_msg string
+    var sql string
+    var nickname string
+ 
+    //Connect database
+    conn, err := db_connect()
+    if err != nil {
+        error_msg = "Failed to connect database，details: " + err.Error()
+        write_log("Error", error_msg)
+        return
+    }
+    //Close connection
+    defer conn.Close()
+    write_log("Log", "Connected to database successful!")
+ 
+    //Insert data
+    sql = "insert into public.opentenbase values('1','opentenbase'),('2','pgxz');"
+    _, err = conn.Exec(sql)
+    if err != nil {
+        error_msg = "Failed to insert data, details: " + err.Error()
+        write_log("Error", error_msg)
+        return
+    } else {
+        write_log("Log", "Insert data successful!")
+    }
+ 
+    //Bind variables to insert data, no need to do anti-injection processing
+    sql = "insert into public.opentenbase values($1,$2),($1,$3);"
+    _, err = conn.Exec(sql, "3", "postgresql", "postgres")
+    if err != nil {
+        error_msg = "Failed to insert data, details: " + err.Error()
+        write_log("Error", error_msg)
+        return
+    } else {
+        write_log("Log", "Insert data successful!")
+    }
+ 
+    //Splice sql statement to insert data, need to do anti-injection processing
+    nickname = "OpenTenBase is ' good!"
+    sql = "insert into public.opentenbase values('1','" + sql_data_encode(nickname) + "')"
+    _, err = conn.Exec(sql)
+    if err != nil {
+        error_msg = "Failed to insert data, details: " + err.Error()
+        write_log("Error", error_msg)
+        return
+    } else {
+        write_log("Log", "Insert data successful!")
+    }
+}
+ 
+/*
+Function：SQL query concatenation string encoding
+ 
+Parameter：
+str -- The string to be encode
+ 
+Return：
+Return encoded string
+ 
+*/
+ 
+func sql_data_encode(str string) string {
+    return strings.Replace(str, "'", "''", -1)
+}
+ 
+/*
+Function：Write log process
+ 
+Parameter：
+log_level -- level of log，only `Error` or `Log`
+error_msg -- content of log
+ 
+Return：none
+*/
+ 
+func write_log(log_level string, error_msg string) {
+    //print error message
+    fmt.Println("Time：", time.Now().Format("2006-01-02 15:04:05"))
+    fmt.Println("Log level：", log_level)
+    fmt.Println("Details：", error_msg)
+}
+ 
+/*
+Function：Connect database
+ 
+Parameter：none
+ 
+Return：
+conn *pgx.Conn -- connection information
+err error -- error message
+ 
+*/
+ 
+func db_connect() (conn *pgx.Conn, err error) {
+    var config pgx.ConnConfig
+    config.Host = "127.0.0.1"    //localhost or ip
+    config.User = "opentenbase"         //username
+    config.Password = "pgsql"    //password
+    config.Database = "postgres" //database name
+    config.Port = 15432          //port
+    conn, err = pgx.Connect(config)
+    return conn, err
+}
+```  
+
+``` 
+[root@VM_0_29_centos opentenbase]# go run insert.go 
+Time： 2018-04-03 21:05:51
+Log level： Log
+Details： Connected to database successful！
+Time： 2018-04-03 21:05:51
+Log level： Log
+Details： Insert data successful!
+Time： 2018-04-03 21:05:51
+Log level： Log
+Details： Insert data successful!
+Time： 2018-04-03 21:05:51
+Log level： Log
+Details： Insert data successful!
+```  
+
+### 6.4、Query data
+```
+package main
+ 
+import (
+    "fmt"
+    "strings"
+    "time"
+ 
+    "github.com/jackc/pgx"
+)
+ 
+func main() {
+    var error_msg string
+    var sql string
+ 
+    //Connect database
+    conn, err := db_connect()
+    if err != nil {
+        error_msg = "Failed to connect database，details: " + err.Error()
+        write_log("Error", error_msg)
+        return
+    }
+    //Close connection
+    defer conn.Close()
+    write_log("Log", "Connected to database successful!")
+ 
+    sql = "SELECT id,nickname FROM public.opentenbase LIMIT 2"
+    rows, err := conn.Query(sql)
+    if err != nil {
+        error_msg = "Failed to query data, details: " + err.Error()
+        write_log("Error", error_msg)
+        return
+    } else {
+        write_log("Log", "Query data successful!")
+    }
+ 
+    var nickname string
+    var id string
+ 
+    for rows.Next() {
+        err = rows.Scan(&id, &nickname)
+        if err != nil {
+            error_msg = "Failed to query data, details: " + err.Error()
+            write_log("Error", error_msg)
+            return
+        }
+        error_msg = fmt.Sprintf("id：%s nickname：%s", id, nickname)
+        write_log("Log", error_msg)
+    }
+    rows.Close()
+ 
+    nickname = "opentenbase"
+ 
+    sql = "SELECT id,nickname FROM public.opentenbase WHERE nickname ='" + sql_data_encode(nickname) + "' "
+    rows, err = conn.Query(sql)
+    if err != nil {
+        error_msg = "Failed to query data, details: " + err.Error()
+        write_log("Error", error_msg)
+        return
+    } else {
+        write_log("Log", "Query data successful!")
+    }
+    defer rows.Close()
+ 
+    for rows.Next() {
+        err = rows.Scan(&id, &nickname)
+        if err != nil {
+            error_msg = "Failed to query data, details: " + err.Error()
+            write_log("Error", error_msg)
+            return
+        }
+        error_msg = fmt.Sprintf("id：%s nickname：%s", id, nickname)
+        write_log("Log", error_msg)
+    }
+}
+ 
+/*
+Function：SQL query concatenation string encoding
+ 
+Parameter：
+str -- The string to be encode
+ 
+Return：
+Return encoded string
+ 
+*/
+ 
+func sql_data_encode(str string) string {
+    return strings.Replace(str, "'", "''", -1)
+}
+ 
+/*
+Function：Write log process
+ 
+Parameter：
+log_level -- level of log，only `Error` or `Log`
+error_msg -- content of log
+ 
+Return：none
+*/
+ 
+func write_log(log_level string, error_msg string) {
+    //print error message
+    fmt.Println("Time：", time.Now().Format("2006-01-02 15:04:05"))
+    fmt.Println("Log level：", log_level)
+    fmt.Println("Details：", error_msg)
+}
+ 
+/*
+Function：Connect database
+ 
+Parameter：none
+ 
+Return：
+conn *pgx.Conn -- connection information
+err error -- error message
+ 
+*/
+ 
+func db_connect() (conn *pgx.Conn, err error) {
+    var config pgx.ConnConfig
+    config.Host = "127.0.0.1"    //localhost or ip
+    config.User = "opentenbase"         //username
+    config.Password = "pgsql"    //password
+    config.Database = "postgres" //database name
+    config.Port = 15432          //port
+    conn, err = pgx.Connect(config)
+    return conn, err
+}
+```  
+``` 
+[root@VM_0_29_centos opentenbase]# go run select.go
+Time： 2018-04-09 10:35:50
+Log level： Log
+Details： Connected to database successful！
+Time： 2018-04-09 10:35:50
+Log level： Log
+Details： Query data successful!
+Time： 2018-04-09 10:35:50
+Log level： Log
+Details： id：2 nickname：opentenbase
+Time： 2018-04-09 10:35:50
+Log level： Log
+Details： id：3 nickname：postgresql
+Time： 2018-04-09 10:35:50
+Log level： Log
+Details： Query data successful!
+Time： 2018-04-09 10:35:50
+Log level： Log
+Details： id：1 nickname：opentenbase
+```  
+
+### 6.5、Copy Stream data into table
+```
+package main
+ 
+import (
+    "fmt"
+    "math/rand"
+    "time"
+ 
+    "github.com/jackc/pgx"
+)
+ 
+func main() {
+    var error_msg string
+ 
+    //Connect database
+    conn, err := db_connect()
+    if err != nil {
+        error_msg = "Failed to connect database，details: " + err.Error()
+        write_log("Error", error_msg)
+        return
+    }
+    //Close connection
+    defer conn.Close()
+    write_log("Log", "Connected to database successful!")
+ 
+    //create 5000 data
+    inputRows := [][]interface{}{}
+    var id string
+    var nickname string
+    for i := 0; i < 5000; i++ {
+        id = fmt.Sprintf("%d", rand.Intn(10000))
+        nickname = fmt.Sprintf("%d", rand.Intn(10000))
+        inputRows = append(inputRows, []interface{}{id, nickname})
+    }
+    copyCount, err := conn.CopyFrom(pgx.Identifier{"opentenbase"}, []string{"id", "nickname"}, pgx.CopyFromRows(inputRows))
+    if err != nil {
+        error_msg = "Failed to use copyfrom, details: " + err.Error()
+        write_log("Error", error_msg)
+        return
+    }
+    if copyCount != len(inputRows) {
+        error_msg = fmt.Sprintf("Failed to use copyfrom，copy lines：%d Return lines：%d", len(inputRows), copyCount)
+        write_log("Error", error_msg)
+        return
+    } else {
+        error_msg = "Copy successful!"
+        write_log("Log", error_msg)
+    }
+ 
+}
+ 
+/*
+Function：Write log process
+ 
+Parameter：
+log_level -- level of log，only `Error` or `Log`
+error_msg -- content of log
+ 
+Return：none
+*/
+ 
+func write_log(log_level string, error_msg string) {
+    //print error message
+    fmt.Println("Time：", time.Now().Format("2006-01-02 15:04:05"))
+    fmt.Println("Log level：", log_level)
+    fmt.Println("Details：", error_msg)
+}
+ 
+/*
+Function：Connect database
+ 
+Parameter：none
+ 
+Return：
+conn *pgx.Conn -- connection information
+err error -- error message
+ 
+*/
+ 
+func db_connect() (conn *pgx.Conn, err error) {
+    var config pgx.ConnConfig
+    config.Host = "127.0.0.1"    //localhost or ip
+    config.User = "opentenbase"         //username
+    config.Password = "pgsql"    //password
+    config.Database = "postgres" //database name
+    config.Port = 15432          //port
+    conn, err = pgx.Connect(config)
+    return conn, err
+}
+``` 
+``` 
+[root@VM_0_29_centos opentenbase]# go run copy_from.go 
+Time： 2018-04-09 10:36:40
+Log level： Log
+Details： Connected to database successful！
+Time： 2018-04-09 10:36:40
+Log level： Log
+Details： Copy successful!
+```
+
+### 6.6、Packages for golang
+Needs to clone from git:  
+https://github.com/jackc/pgx  
+https://github.com/pkg/errors  
diff --git a/docs/guide/02-access.md b/docs/guide/02-access.md
index 4a0b267..d3bfd73 100644
--- a/docs/guide/02-access.md
+++ b/docs/guide/02-access.md
@@ -786,7 +786,7 @@ if (!$result){
     echo "查询数据出错，详情：".$error_msg."\n";
     exit;
 }else{
-    echo "插入数据成功"."\n";      
+    echo "查询数据成功"."\n";      
 }
 $record_num = pg_numrows($result);  
 echo "返回记录数".$record_num."\n"; 
@@ -805,7 +805,7 @@ pg_close($conn);
 ``` 
 [root@VM_0_47_centos ~]# curl http://127.0.0.1:8080/dbsta/test/select.php
 连接数据库成功
-插入数据成功
+查询数据成功
 返回记录数2
 记录数#1
 id：1
@@ -937,7 +937,7 @@ func main() {
 功能描述：写入日志处理
  
 参数说明：
-log_level -- 日志级别，只能是是Error或Log
+log_level -- 日志级别，只能是`Error`或`Log`
 error_msg -- 日志内容
  
 返回值说明：无
@@ -957,7 +957,7 @@ func write_log(log_level string, error_msg string) {
  
 返回值说明：
 conn *pgx.Conn -- 连接信息
-err error --错误信息
+err error -- 错误信息
  
 */
  
@@ -1032,7 +1032,7 @@ func main() {
 功能描述：写入日志处理
  
 参数说明：
-log_level -- 日志级别，只能是是Error或Log
+log_level -- 日志级别，只能是`Error`或`Log`
 error_msg -- 日志内容
  
 返回值说明：无