1. 处理 sql server 导出的 datetime 类型的字段
在进行sql server向mysql等其他数据进行迁移数据时，会发现使用sql server导出的datetime类型的结果是16进制表示的二进制的结果，类似于：CAST(0x00009E0E0095524F AS DateTime)，这样形式的datetime是无法向其他数据库插入的，所以需要将这种表现形式进行转换。搜索了很久，才在在stackoverflow上找到正确的转换方法。在网上看到很多人都这个问题都不知道解决办法，本文采用Java语言根据stackoverflow介绍的原理，进行编码实现转换。
注意，因为datetime分为了4字节形式(SmallDateTime)和8字节形式(DateTime)，所有对应的又两种转换方法。另外本转义方法，只能精确到秒级别，毫秒级别是不精确的。如果需要完全精确的转换，请采用其他工具进行转换，比如sqlyog, mysql workbench等工具。
下面是具体的代码：
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* sql server数据库在向mysql等数据库迁移数据时，会遇到一个麻烦，sql server导出的datetime的结果是16进制形式的二进制结果，
* 类似于 CAST(0x00009E0E0095524F AS DateTime)，这样的导出结果是无法直接向mysql数据库中导入的，所以需要对sql server
* 导出的脚本中的所有的 datetime 字段类型进行转换，转换成mysql等数据库认可的结果：2010-10-13 09:03:39
* 才能正确的完成sql server数据向mysql等数据库的迁移。
* 注意本方法只能精确到秒级别，毫秒级别是不精确的。
* 具体转换原理，参见：http://stackoverflow.com/questions/12033598/cast-hex-as-datatime-how-to-get-date
* @author digdeep@126.com
*/
public class SqlServerDateTimeUtils {
private static final Calendar cal = Calendar.getInstance();
static{
cal.set(Calendar.YEAR, 1900);
cal.set(Calendar.MONTH, Calendar.JANUARY);
cal.set(Calendar.DATE, 1);
cal.set(Calendar.HOUR_OF_DAY, 0);
cal.set(Calendar.MINUTE, 0);
cal.set(Calendar.SECOND, 0); // 1900-01-01 00:00:00
}
/**
* 将sql server导出的16进制datetime字段： CAST(0x00009E0E0095524F AS DateTime) 形式转换成字符串形式：
* 2010-10-13 09:03:39 ，以利于 sql server 向 mysql, oracle 迁移数据
* @param rawDateTime
* @return
* reference: http://stackoverflow.com/questions/12033598/cast-hex-as-datatime-how-to-get-date
*/
public static String convertRawDateTimeToStr(String rawDateTime){
return convertRawToStr(rawDateTime, false);
}
/**
* 将sql server导出的datetime字段结果 CAST(0x00009E0E0095524F AS DateTime)，转换成
* 2010-10-13 09:03:39 或者 2010-10-13 09:03:39.394 注意毫秒部分不精确
* @param rawDateTime
* @param millisecondFlag 结果是否需要带毫秒部分
* @return
* reference: http://stackoverflow.com/questions/12033598/cast-hex-as-datatime-how-to-get-date
*/
public static String convertRawToStr(String rawDateTime, boolean millisecondFlag) {
if (rawDateTime == null || rawDateTime.trim().equals(""))
return null;
String rawData = rawDateTime.substring("CAST(".length(), rawDateTime.toUpperCase().indexOf(" AS DATETIME"));
if (rawData == null || rawData.trim().equals(""))
return null;
rawData = rawData.trim();
String result = null;
if(rawData.length() <= 10){ // rowData = "0x993a02CE"
result = getDateTimeStr4Bytes(rawData);
}
if(rawData.length() > 10 && rawData.length() <= 18){ // rowData = "0x00009E0E0095524F"
result = getDateTimeStr8Bytes(rawData, millisecondFlag);
}
return result;
}
/**
* sql server 利用 SmallDateTime 4个字节
* select CAST(0x993902CE as SmallDateTime);
* 2007-05-25 11:58:00 (只精确到分钟？？？)
*
* mysql:
* SELECT "0x993902CE" INTO @raw_data;
* SELECT conv(substr(@raw_data, 3, 4), 16, 10) INTO @days;
* SELECT conv(substr(@raw_data, 7, 4), 16, 10) INTO @minutes;
* SELECT "1900-01-01 00:00:00" INTO @start_date;
* SELECT date_add(@start_date, interval @days DAY) INTO @date_plus_years;
* SELECT date_add(@date_plus_years, interval @minutes MINUTE) INTO @final_date;
* select @final_date;
* 2007-05-25 11:58:00
* @param rawData
* @return
*/
private static String getDateTimeStr4Bytes(String rawData){
String day = rawData.substring(2, 2 + 4); // rowData = "0x993a02CE"
String minutes = rawData.substring(6, 6 + 4);
Calendar calendar = Calendar.getInstance();
calendar.setTimeInMillis(cal.getTimeInMillis()); // 1900-01-01 00:00:00
calendar.add(Calendar.DATE, Integer.parseInt(day, 16));
calendar.add(Calendar.MINUTE, Integer.parseInt(minutes, 16));
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
return sdf.format(calendar.getTime());
}
/**
* sql server DateTime 利用 8 字节表示， 该转换精确到秒，无毫秒部分
* @param rawData
* @param millisecondFlag 结果是否需要带毫秒部分
* @return
*
*/
private static String getDateTimeStr8Bytes(String rawData, boolean millisecondFlag){
String day = rawData.substring(2, 2 + 8); // 4字节表示距离1900年的天数
String fraction = rawData.substring(10, 10 + 8); // 4字节表示剩余的部分 faction
int millis = (int)(Integer.parseInt(fraction, 16) * 3.33333); // faction*3.3333 之后表示的是毫秒数
int seconds= millis / 1000; // 得到秒数
Calendar calendar = Calendar.getInstance();
calendar.setTimeInMillis(cal.getTimeInMillis()); // 1900-01-01 00:00:00
calendar.add(Calendar.DATE, Integer.parseInt(day, 16)); // 加上天数
calendar.add(Calendar.SECOND, seconds); // 加上秒数
// calendar.add(Calendar.MILLISECOND, millis); // 采用 Calendar.MILLISECOND 计算会导致在秒级别的出现误差
SimpleDateFormat sdf = null;
if(millisecondFlag)
sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS"); // 毫秒部分是不精确的，毫秒部分每次运行的结果不相同！
else
sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); // 不带毫秒部分，秒级别是精确的，每次运行的结果相同
return sdf.format(calendar.getTime());
}
public static void main(String[] args) {
//sql server: select CAST(0x00009E0E0095524F AS DateTime) == 2010-10-13 09:03:39.783 正确的日期值
String str = "CAST(0x00009E0E0095524F AS DateTime)";
System.out.println(convertRawToStr(str, true)); // 2010-10-13 09:03:39.374 毫秒部分不精确
System.out.println(convertRawDateTimeToStr(str)); // 2010-10-13 09:03:39 秒级别是精确的
try {
// 这里的字符集一般是 StandardCharsets.UTF_16 或者 StandardCharsets.UTF_8，具体看你导出时采用的是那种字符集
BufferedReader reader = Files.newBufferedReader(Paths.get("F:\Members.sql"), StandardCharsets.UTF_16);
BufferedWriter writer = Files.newBufferedWriter(Paths.get("F:\Members_mysql.sql"), StandardCharsets.UTF_8);
String line = null;
Matcher matcher = null;
String matcherStr = null;
String reg = ".*((?i)CAST\(0x[0-9-a-f-A-F]+ AS DateTime\)).*"; // ( 为特殊字符，表示普通的( 需要用 \( 来转义表示
Pattern pattern = Pattern.compile(reg);
while ((line = reader.readLine()) != null) {
while (line.matches(reg)) {
matcher = pattern.matcher(line);
matcherStr = null;
if (matcher.find()) {
matcherStr = matcher.group(1); // matcherStr = "CAST(0x00009E0E0095524F AS DateTime)"
if (matcherStr != null) {
String mysqlStr = convertRawDateTimeToStr(matcherStr);
if(mysqlStr != null)
line = line.replace(matcherStr, " '"+mysqlStr+"' "); // mysqlStr = '2010-10-13 09:03:39'
}
} else {
break; // break inner while loop
}
}
writer.write(line);
writer.newLine();
}
} catch (Exception e) {
e.printStackTrace();
}
System.out.println("done.");
}
}
正则表达式 String reg = ".*((?i)CAST\(0x[0-9-a-f-A-F]+ AS DateTime\)).*"; 其中的 (?i) 表示不区分字符的大小写，类似于js中的 /xx/i
在 F:\Members.sql 中保存的是sql server导出的insert语句形式的数据：
INSERT [Members] ([g_MemberID], [FK_GroupId], [FK_UserId], [FK_C_UserId], [g_Member_State], [g_Member_Jobtitle], [g_Member_Open], [g_Member_Nickname], [g_Member_FirstnamePY], [g_Member_Firstname], [g_Member_LastnamePY], [g_Member_Lastname], [g_Member_sex], [g_Member_Birthday], [g_Member_MaritalStatus], [FK_City], [g_Member_FacePath], [g_Member_Address], [g_Member_Mobile], [g_Member_hometel], [g_Member_Email], [g_Member_QQ], [g_Member_Wangwang], [g_Member_Msn], [g_Member_Note], [g_Member_JoinTime], [FK_User_AttnUserID], [g_push], [g_Member_Order], [gmt_last_modified]) VALUES (1, 1, 4, 4, 40, NULL, 30, N'大手机', N'', N'', N'总', N'总', N'M', N'2013-11-31', NULL, 11, N'20131231/2013123115MF0DD3.jpg', N'', N'13900000000', N'', N'', N'', N'', N'', N'', NULL, NULL, NULL, NULL, CAST(0x0000A2A500FC2E4F AS DateTime)) INSERT [Members] ([g_MemberID], [FK_GroupId], [FK_UserId], [FK_C_UserId], [g_Member_State], [g_Member_Jobtitle], [g_Member_Open], [g_Member_Nickname], [g_Member_FirstnamePY], [g_Member_Firstname], [g_Member_LastnamePY], [g_Member_Lastname], [g_Member_sex], [g_Member_Birthday], [g_Member_MaritalStatus], [FK_City], [g_Member_FacePath], [g_Member_Address], [g_Member_Mobile], [g_Member_hometel], [g_Member_Email], [g_Member_QQ], [g_Member_Wangwang], [g_Member_Msn], [g_Member_Note], [g_Member_JoinTime], [FK_User_AttnUserID], [g_push], [g_Member_Order], [gmt_last_modified]) VALUES (2, 2, 4, 4, 40, N'锦鲤', 30, N'', N'', N'测试', N'总', N'陈', N'M', N'2013-11-31', 0, 11, N'20140324/2014032409Xva2Ix.jpg', N'', N'13900000000', N'', N'', N'', N'', N'', N'', NULL, NULL, NULL, NULL, CAST(0x0000A2F80095DF52 AS DateTime))
转换之后的结果保存在 F:\Members_mysql.sql 中，类似于：
INSERT [Members] ([g_MemberID], [FK_GroupId], [FK_UserId], [FK_C_UserId], [g_Member_State], [g_Member_Jobtitle], [g_Member_Open], [g_Member_Nickname], [g_Member_FirstnamePY], [g_Member_Firstname], [g_Member_LastnamePY], [g_Member_Lastname], [g_Member_sex], [g_Member_Birthday], [g_Member_MaritalStatus], [FK_City], [g_Member_FacePath], [g_Member_Address], [g_Member_Mobile], [g_Member_hometel], [g_Member_Email], [g_Member_QQ], [g_Member_Wangwang], [g_Member_Msn], [g_Member_Note], [g_Member_JoinTime], [FK_User_AttnUserID], [g_push], [g_Member_Order], [gmt_last_modified]) VALUES (1, 1, 4, 4, 40, NULL, 30, N'大手机', N'', N'', N'总', N'总', N'M', N'2013-11-31', NULL, 11, N'20131231/2013123115MF0DD3.jpg', N'', N'13900000000', N'', N'', N'', N'', N'', N'', NULL, NULL, NULL, NULL, '2013-12-31 15:18:09' ) INSERT [Members] ([g_MemberID], [FK_GroupId], [FK_UserId], [FK_C_UserId], [g_Member_State], [g_Member_Jobtitle], [g_Member_Open], [g_Member_Nickname], [g_Member_FirstnamePY], [g_Member_Firstname], [g_Member_LastnamePY], [g_Member_Lastname], [g_Member_sex], [g_Member_Birthday], [g_Member_MaritalStatus], [FK_City], [g_Member_FacePath], [g_Member_Address], [g_Member_Mobile], [g_Member_hometel], [g_Member_Email], [g_Member_QQ], [g_Member_Wangwang], [g_Member_Msn], [g_Member_Note], [g_Member_JoinTime], [FK_User_AttnUserID], [g_push], [g_Member_Order], [gmt_last_modified]) VALUES (2, 2, 4, 4, 40, N'锦鲤', 30, N'', N'', N'测试', N'总', N'陈', N'M', N'2013-11-31', 0, 11, N'20140324/2014032409Xva2Ix.jpg', N'', N'13900000000', N'', N'', N'', N'', N'', N'', NULL, NULL, NULL, NULL, '2014-03-24 09:05:40.358' )
可以看到
CAST(0x0000A2A500FC2E4F AS DateTime) 被转换成了：'2013-12-31 15:18:09'
CAST(0x0000A2F80095DF52 AS DateTime) 被转换成了：'2014-03-24 09:05:40'
当然要达到直接运行插入mysql数据库中，还要去掉 [g_MemberID] 中的 [] 中括号，还有每一行的末尾要加上逗号 , 再者 INSERT [Members] ([g_MemberID], [FK_GroupId], ...) 语句只需要出现一次，采用 insert into tab(col_a,col_b,col_c) values (1,2,3), (4,5,6) ... 这样的插入形式，可以明显提高插入速度。
另外，如果sql server导出时，如果选择导出到excel时，datetime字段的值是不需要进行转换的。在数据量很小时，可以选择这种方式。
2. 处理 sql server 导出的 decimal 类型字段 和 insert 语句
sql server在导出 decimal 类型的字段时，导出的结果是类似于：CAST(5.00 AS Decimal(6, 2)) 这样的形式，我们需要将其转换成 5.00，还有上面说到的要去掉[g_MemberID] 中的 [] 中括号, 每一行的末尾要加上逗号，还有要转换成 insert into tab(col_a,col_b,col_c) values (1,2,3), (4,5,6), ....; 形式的结果。下面给出一个相对完整的处理代码：
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* sql server数据库在向mysql等数据库迁移数据时，会遇到几个麻烦
* 1) datetime 类型字段的导出结果需要转换；
* 2) decimal 类型的字段的导出结果需要转换；
* 3) insert 语句需要去掉 [和 ], 去掉多余的 insert, 最后变成 insert into user(id,name) values(1,'aa'), (2,'bb'); 的形式
* @author digdeep@126.com
*/
public class SqlServerConverter {
private static final int insertSQLcount = 10;
private static String reg = ".*((?i)CAST\(0x[0-9-a-f-A-F]+ AS DateTime\)).*"; // CAST(0x00009E0E0095524F AS DateTime)
private static Pattern pattern = Pattern.compile(reg);
private static String sqlInertReg = ".*((?i)INSERT .* \(.*\) VALUES )\(.*\).*"; //insert member (id,name) values (xxx)
private static Pattern sqlInertPattern = Pattern.compile(sqlInertReg);
private static String decimalReg = ".*((?i)CAST\(.* AS Decimal\(.*\)\)).*";; //CAST(5.00 AS Decimal(6, 2))
private static Pattern decimalPattern = Pattern.compile(decimalReg);
/**
* 将每一条insert语句中的 "CAST(0x00009E0E0095524F AS DateTime)" 转换成对应的：'2010-10-13 09:03:39'
* @param line
* @return
*/
public static String dealWithDateTime(String line){
Matcher matcher = null;
String matcherStr = null;
while (line.matches(reg)) {
matcher = pattern.matcher(line);
matcherStr = null;
if (matcher.find()) {
matcherStr = matcher.group(1); // matcherStr = "CAST(0x00009E0E0095524F AS DateTime)"
if (matcherStr != null) {
String mysqlStr = SqlServerDateTimeUtils.convertRawDateTimeToStr(matcherStr);
if(mysqlStr != null)
line = line.replace(matcherStr, " '"+mysqlStr+"' "); // mysqlStr = '2010-10-13 09:03:39'
}
} else {
break; // break inner while loop
}
}
return line;
}
/**
* 将每一条insert语句中的 "CAST(5.00 AS Decimal(6, 2))" 转换成对应的：5.00
* @param line
* @return
*/
public static String dealWithDecimal(String line){
Matcher matcher = null;
String matcherStr = null;
while (line.matches(decimalReg)) {
matcher = decimalPattern.matcher(line);
matcherStr = null;
if (matcher.find()) {
matcherStr = matcher.group(1); // matcherStr = CAST(5.00 AS Decimal(6, 2))
if (matcherStr != null) {
String result = matcherStr.substring("CAST(".length(),
matcherStr.toUpperCase().indexOf(" AS DECIMAL("));
line = line.replace(matcherStr, result);
}
} else {
break; // break inner while loop
}
}
return line;
}
/**
* @param sqlServerPath 输入文件
* @param sqlCharset 输入文件的编码
* @param mysqlPath 输出文件，以utf-8格式输出
* @return
*/
public static boolean converterSqlServerToMySQL(String sqlServerFile, Charset sqlServerCharset, String mysqlFile){
Path inPath = Paths.get(sqlServerFile);
Path outPath = Paths.get(mysqlFile);
// writer 采用 StandardCharsets.UTF_8
try(BufferedReader reader = Files.newBufferedReader(inPath, sqlServerCharset);
BufferedWriter writer = Files.newBufferedWriter(outPath, StandardCharsets.UTF_8);){
String line = null;
Matcher matcher = null;
String matcherStr = null;
int i = 0;
while ((line = reader.readLine()) != null) {
// 1. 转换 datetime: CAST(0x00009E0E0095524F AS DateTime) 转换成 '2010-10-13 09:03:39'
line = dealWithDateTime(line);
// 2. 转换decimal: CAST(5.00 AS Decimal(6, 2)) 转换成 5.00
line = dealWithDecimal(line);
// 3. 去掉 [ 和 ], 去掉多余的 insert, 最后变成 insert into user(id,name) values(1,'aa'), (2,'bb'); 的形式
matcher = sqlInertPattern.matcher(line);
if(matcher.find()){
i++;
matcherStr = matcher.group(1); // matcherStr == insert [user]([id], [name]) values (1,'aa')
if(i % insertSQLcount == 1){ // 每 insertSQLcount 条 insert 作为一组进行提交
if(i > 1){
writer.write(";"); // 加入 ; 进行提交
writer.newLine();
}
line = line.replace(matcherStr, " "); // line == (1,'aa')
matcherStr = matcherStr.replace("[", "");
matcherStr = matcherStr.replace("]", "");
matcherStr = matcherStr.toLowerCase().replace("insert", "insert into ");
line = matcherStr + "
" + line; // line == insert into user(id,name)
values(1,'aa')
}else{
line = line.replace(matcherStr, ","); // line == ,values(2,'aa')
}
writer.write(line);
writer.newLine();
}
}
if(i % insertSQLcount != 1 && i > 0) // 当末尾没有封号(;)， 时才添加一个封号(;)，避免在末尾出现两个封号(;;)
writer.write(";");
writer.newLine();
writer.flush(); // 注意这里一定要 flush ，不然文档的最后面的最后一两条数据不会完整写到文件中的！！！
} catch (Exception e) {
e.printStackTrace();
return false;
}
System.out.println("OK.");
return true;
}
public static void main(String[] args) {
// 这里的字符集一般是 StandardCharsets.UTF_16 或者 StandardCharsets.UTF_8，具体看你导出时采用的是那种字符集
// 如果sql server导出时选择了 unicode，那么这里就应该使用 StandardCharsets.UTF_16
SqlServerConverter.converterSqlServerToMySQL("F:\Members.sql", StandardCharsets.UTF_16,
"F:\Members_mysql.sql");
System.out.println("-------------------------------------------------");
SqlServerConverter.converterSqlServerToMySQL("F:\model_choise.sql", StandardCharsets.UTF_16,
"F:\model_choise_mysql.sql");
System.out.println("done.");
}
}
转换之前 F:\model_choise.sql 的文件内容如下所示：
SET IDENTITY_INSERT [model_choise] ON INSERT [model_choise] ([id], [gid], [member_id], [user_id], [model_id], [status], [choise_time], [item_id], [pay_amount], [accuracy], [g_name], [g_mobile], [reation_id]) VALUES (992, NULL, NULL, 736, 481, 1, CAST(0x0000A49500C0DE5F AS DateTime), NULL, NULL, NULL, NULL, NULL, NULL) INSERT [model_choise] ([id], [gid], [member_id], [user_id], [model_id], [status], [choise_time], [item_id], [pay_amount], [accuracy], [g_name], [g_mobile], [reation_id]) VALUES (993, NULL, NULL, 737, 559, 1, CAST(0x0000A49501420847 AS DateTime), NULL, NULL, NULL, NULL, NULL, NULL) INSERT [model_choise] ([id], [gid], [member_id], [user_id], [model_id], [status], [choise_time], [item_id], [pay_amount], [accuracy], [g_name], [g_mobile], [reation_id]) VALUES (1009, NULL, NULL, 9, 528, 1, CAST(0x0000A496013F1119 AS DateTime), NULL, NULL, CAST(5.00 AS Decimal(6, 2)), NULL, NULL, NULL) INSERT [model_choise] ([id], [gid], [member_id], [user_id], [model_id], [status], [choise_time], [item_id], [pay_amount], [accuracy], [g_name], [g_mobile], [reation_id]) VALUES (1010, NULL, NULL, 4, 528, 1, CAST(0x0000A496013F9F76 AS DateTime), NULL, NULL, CAST(5.00 AS Decimal(6, 2)), NULL, NULL, NULL) // ... ...
转换之后 F:\model_choise_mysql.sql 内容如下所示：
insert into model_choise (id, gid, member_id, user_id, model_id, status, choise_time, item_id, pay_amount, accuracy, g_name, g_mobile, reation_id) values (992, NULL, NULL, 736, 481, 1, '2015-05-11 11:42:12' , NULL, NULL, NULL, NULL, NULL, NULL) ,(993, NULL, NULL, 737, 559, 1, '2015-05-11 19:32:28' , NULL, NULL, NULL, NULL, NULL, NULL) ,(1009, NULL, NULL, 9, 528, 1, '2015-05-12 19:21:41' , NULL, NULL, 5.00, NULL, NULL, NULL) ,(1010, NULL, NULL, 4, 528, 1, '2015-05-12 19:23:42' , NULL, NULL, 5.00, NULL, NULL, NULL) ,(1011, NULL, NULL, 4, 495, 1, '2015-05-12 19:24:38' , NULL, NULL, NULL, NULL, NULL, NULL) ,(1012, NULL, NULL, 4, 554, 1, '2015-05-12 19:25:23' , NULL, NULL, NULL, NULL, NULL, NULL) ,(1013, NULL, NULL, 566, 528, -1, '2015-05-12 20:33:24' , NULL, NULL, 5.00, NULL, NULL, NULL) ,(1014, NULL, NULL, 8, 495, -1, '2015-05-12 21:03:45' , NULL, NULL, 5.00, NULL, NULL, NULL) ,(1015, NULL, NULL, 8, 498, -1, '2015-05-12 21:04:15' , NULL, NULL, 5.00, NULL, NULL, NULL) ,(1016, NULL, NULL, 8, 558, -1, '2015-05-12 21:04:39' , NULL, NULL, 5.00, NULL, NULL, NULL) ; insert into model_choise (id, gid, member_id, user_id, model_id, status, choise_time, item_id, pay_amount, accuracy, g_name, g_mobile, reation_id) values (1017, NULL, NULL, 8, 417, -1, '2015-05-12 21:05:29' , NULL, NULL, 5.00, NULL, NULL, NULL) ,(1018, NULL, NULL, 8, 494, -1, '2015-05-12 21:29:20' , NULL, NULL, 4.00, NULL, NULL, NULL) ,(1019, NULL, NULL, 8, 528, -1, '2015-05-12 21:31:41' , NULL, NULL, 5.00, NULL, NULL, NULL) ,(1026, NULL, NULL, 566, 493, 1, '2015-05-13 02:14:09' , NULL, NULL, 5.00, NULL, NULL, NULL) ,(1027, NULL, NULL, 566, 532, 1, '2015-05-13 02:14:17' , NULL, NULL, 5.00, NULL, NULL, NULL) ,(1028, NULL, NULL, 566, 459, 1, '2015-05-13 09:16:44' , NULL, NULL, 5.00, NULL, NULL, NULL) ,(1029, NULL, NULL, 566, 421, -1, '2015-05-13 10:03:52' , NULL, NULL, 5.00, NULL, NULL, NULL) ,(1032, NULL, NULL, 9, 495, 1, '2015-05-13 13:27:32' , NULL, NULL, 5.00, NULL, NULL, NULL) ,(1033, NULL, NULL, 9, 554, 1, '2015-05-13 13:28:21' , NULL, NULL, 5.00, NULL, NULL, NULL) ,(1034, NULL, NULL, 9, 560, -1, '2015-05-13 17:10:21' , NULL, NULL, NULL, NULL, NULL, NULL) ;
// ... ...
可以看到 CAST(0x0000A496013F1119 AS DateTime), 和 CAST(5.00 AS Decimal(6, 2)) 都被正确的转换了。insert 语句的转换也是完全正确的。所以转换之后的文件 F:\model_choise_mysql.sql 是可以如下使用 source 命令来直接插入mysql数据库中:
mysql> source F:\model_choise_mysql.sql Query OK, 10 rows affected (0.03 sec) Records: 10 Duplicates: 0 Warnings: 0 Query OK, 10 rows affected (0.05 sec) Records: 10 Duplicates: 0 Warnings: 0 Query OK, 10 rows affected (0.04 sec) Records: 10 Duplicates: 0 Warnings: 0 Query OK, 10 rows affected (0.04 sec) Records: 10 Duplicates: 0 Warnings: 0 Query OK, 10 rows affected (0.05 sec) Records: 10 Duplicates: 0 Warnings: 0 Query OK, 10 rows affected (0.02 sec) Records: 10 Duplicates: 0 Warnings: 0 Query OK, 10 rows affected (0.02 sec) Records: 10 Duplicates: 0 Warnings: 0 Query OK, 10 rows affected (0.02 sec) Records: 10 Duplicates: 0 Warnings: 0 Query OK, 8 rows affected (0.03 sec) Records: 8 Duplicates: 0 Warnings: 0 mysql> select count(*) from model_choise; +----------+ | count(*) | +----------+ | 88 | +----------+ 1 row in set (0.00 sec)
实际使用时，private static final int insertSQLcount = 10; insertSQLcount 应该调大一点，几百，上千都是可以的。
另外上面使用了 Java 1.7 中新引入的 try-with-recourse 的自动关闭资源的使用方法:
try(BufferedReader reader = Files.newBufferedReader(inPath, StandardCharsets.UTF_16);
BufferedWriter writer = Files.newBufferedWriter(outPath, StandardCharsets.UTF_8);)