如何设置mysql系统变量 让excel导入更快

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首先，设置mysql的环境变量（在path中添加%MYSQL_HOME%\bin），重启电脑。

完整代码：

备份：

public static void main(String[] args) {

backup()

load()

}

public static void backup() {

try {

Runtime rt = Runtime.getRuntime()

// 调用 mysql 的 cmd:

Process child = rt

.exec("mysqldump -u root --set-charset=utf8 bjse act_obj")// 设置导出编码为utf8。这里必须是utf8

// 把进程执行中的控制台输出信息写入.sql文件，即生成了备份文件。注：如果不对控制台信息进行读出，则会导致进程堵塞无法运行

InputStream in = child.getInputStream()// 控制台的输出信息作为输入流

InputStreamReader xx = new InputStreamReader(in, "utf8")// 设置输出流编码为utf8。这里必须是utf8，否则从流中读入的是乱码

String inStr

StringBuffer sb = new StringBuffer("")

String outStr

// 组合控制台输出信息字符串

BufferedReader br = new BufferedReader(xx)

while ((inStr = br.readLine()) != null) {

sb.append(inStr + "\r\n")

}

outStr = sb.toString()

// 要用来做导入用的sql目标文件：

FileOutputStream fout = new FileOutputStream(

"e:/mysql-5.0.27-win32/bin/bjse22.sql")

OutputStreamWriter writer = new OutputStreamWriter(fout, "utf8")

writer.write(outStr)

// 注：这里如果用缓冲方式写入文件的话，会导致中文乱码，用flush()方法则可以避免

writer.flush()

// 别忘记关闭输入输出流

in.close()

xx.close()

br.close()

writer.close()

fout.close()

System.out.println("")

} catch (Exception e) {

e.printStackTrace()

}

}

public static void load() {

try {

String fPath = "e:/mysql-5.0.27-win32/bin/bjse22.sql"

Runtime rt = Runtime.getRuntime()

// 调用 mysql 的 cmd:

Process child = rt.exec("mysql -u root bjse ")

OutputStream out = child.getOutputStream()//控制台的输入信息作为输出流

String inStr

StringBuffer sb = new StringBuffer("")

String outStr

BufferedReader br = new BufferedReader(new InputStreamReader(

new FileInputStream(fPath), "utf8"))

while ((inStr = br.readLine()) != null) {

sb.append(inStr + "\r\n")

}

outStr = sb.toString()

OutputStreamWriter writer = new OutputStreamWriter(out, "utf8")

writer.write(outStr)

// 注：这里如果用缓冲方式写入文件的话，会导致中文乱码，用flush()方法则可以避免

writer.flush()

// 别忘记关闭输入输出流

out.close()

br.close()

writer.close()

System.out.println("")

} catch (Exception e) {

e.printStackTrace()

}

}

备份语句：

mysql>SELECT * INTO OUTFILE "D:\\data\\db_testtemp.txt" fields terminated by ',

' from db_testtemp where std_state='1'

Query OK, 1 row affected (0.00 sec)

mysql>SELECT * INTO OUTFILE "D:\\data\\db_testtemp.txt" fields terminated by ',

' from db_testtemp

Query OK, 2 rows affected (0.00 sec)

只生成一个只有数据的.txt:SELECT * INTO OUTFILE "D:\\data\\db_testtemp.txt" fields terminated by ',' lines terminated by '\r\n' from db_testtemp

只生成一个只有数据的.txt:mysqldump -uroot -pncae2010 -w "std_state='1'" -T D:\data --no-create-info --fields-terminated-by=, exam db_testtemp

生成一个创建数据库语句的.sql,一个只有数据的.txt:mysqldump -uroot -pncae2010 -w "std_state='1'" -T D:\data --fields-terminated-by=, exam db_testtemp

只生成insert语句：mysqldump -uroot -pncae2010 -w "std_state='1'" -t exam db_testtemp >D:\data\a.sql

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