biuaxia

/* This example implements basic operations such as inserting data, modifying data, deleting data, and querying data. */
package main

// Import relevant packages
import (
	"database/sql"
	"dm"
	"fmt"
	"io/ioutil"
	"time"
)

var db *sql.DB
var err error

func main() {
	driverName := "dm"
	dataSourceName := "dm://SYSDBA:SYSDBA@localhost:5236"
	if db, err = connect(driverName, dataSourceName); err != nil {
		fmt.Println(err)
		return
	}
	if err = insertTable(); err != nil {
		fmt.Println(err)
		return
	}
	if err = updateTable(); err != nil {
		fmt.Println(err)
		return
	}
	if err = queryTable(); err != nil {
		fmt.Println(err)
		return
	}
	if err = deleteTable(); err != nil {
		fmt.Println(err)
		return
	}
	if err = disconnect(); err != nil {
		fmt.Println(err)
		return
	}
}

/* Create a database connection */
func connect(driverName string, dataSourceName string) (*sql.DB, error) {
	var db *sql.DB
	var err error
	if db, err = sql.Open(driverName, dataSourceName); err != nil {
		return nil, err
	}
	if err = db.Ping(); err != nil {
		return nil, err
	}
	fmt.Printf("connect to \"%s\" succeed.\n", dataSourceName)
	return db, nil
}

/* Insert data into the product information table */
func insertTable() error {
	var inFileName = "D:\\三国演义.jpg"
	var sql = `INSERT INTO production.product(name,author,publisher,publishtime,
product_subcategoryid,productno,satetystocklevel,originalprice,nowprice,discount,
description,photo,type,papertotal,wordtotal,sellstarttime,sellendtime)
VALUES(:1,:2,:3,:4,:5,:6,:7,:8,:9,:10,:11,:12,:13,:14,:15,:16,:17);`
	data, err := ioutil.ReadFile(inFileName)
	if err != nil {
		return err
	}
	t1, _ := time.Parse("2006-Jan-02", "2005-Apr-01")
	t2, _ := time.Parse("2006-Jan-02", "2006-Mar-20")
	t3, _ := time.Parse("2006-Jan-02", "1900-Jan-01")
	_, err = db.Exec(sql, "三国演义", "罗贯中", "中华书局", t1, 4, "9787101046126", 10, 19.0000, 15.2000,
		8.0,
		"《三国演义》是中国第一部长篇章回体小说，中国小说由短篇发展至长篇的原因与说书有关。",
		data, "25", 943, 93000, t2, t3)
	if err != nil {
		return err
	}
	fmt.Println("insertTable succeed")
	return nil
}

/* Modify data in the product information table */
func updateTable() error {
	var sql = "UPDATE production.product SET name = :name WHERE productid = 11;"
	if _, err := db.Exec(sql, "三国演义（上）"); err != nil {
		return err
	}
	fmt.Println("updateTable succeed")
	return nil
}

/* Query the product information table */
func queryTable() error {
	var productid int
	var name string
	var author string
	var description dm.DmClob
	var photo dm.DmBlob
	var sql = "SELECT productid,name,author,description,photo FROM production.product WHERE productid=11"
	rows, err := db.Query(sql)
	if err != nil {
		return err
	}
	defer rows.Close()
	fmt.Println("queryTable results:")
	for rows.Next() {
		if err = rows.Scan(&productid, &name, &author, &description, &photo); err != nil {
			return err
		}
		blobLen, _ := photo.GetLength()
		fmt.Printf("%v %v %v %v %v\n", productid, name, author, description, blobLen)
	}
	return nil
}

/* Delete data from the product information table */
func deleteTable() error {
	var sql = "DELETE FROM production.product WHERE productid = 12;"
	if _, err := db.Exec(sql); err != nil {
		return err
	}
	fmt.Println("deleteTable succeed")
	return nil
}

/* Close the database connection */
func disconnect() error {
	if err := db.Close(); err != nil {
		fmt.Printf("db close failed: %s.\n", err)
		return err
	}
	fmt.Println("disconnect succeed")
	return nil
}