因项目中有需要需根据MySQL表数据生成INSERT INTO语句,在网上找了些现成的代码,原作者是谁就不知道了,但是发现有BUG,不能适用,遂对他人代码进行了修改。修改后能较好的导出INSERT INTO语句。
代码如下:
package dwz.interaction;
import Java.io.*;
import java.sql.*;
import java.util.ArrayList;
import java.util.List;
/**
* Update by internetroot on 2014-09-06.
*/
public class SqliteSQLGenerator {
private static Connection conn = null;
private static Statement sm = null;
private static String insert = "INSERT INTO";//插入sql
private static String values = "VALUES";//values关键字
private static List<String> tableList = new ArrayList<String>();//全局存放表名列表
private static List<String> insertList = new ArrayList<String>();//全局存放insertsql文件的数据
private static String filePath = "E://insertSQL.txt";//绝对路径 导出数据的文件
public static String generateTableDataSQL(String sql, String[] params) {
return null;
}
public static String executeSelectSQLFile(String file, String[] params) throws Exception {
List<String> listSQL = new ArrayList<String>();
connectSQL("com.mysql.jdbc.Driver", "jdbc:mysql://127.0.0.1:3308/htedu?useUnicode=true&characterEncoding=UTF-8", "root", "");//连接数据库
listSQL = createSQL(file);//创建查询语句
executeSQL(conn, sm, listSQL, tableList);//执行sql并拼装
createFile();//创建文件
return null;
}
/**
* 拼装查询语句
*
* @return 返回select集合
*/
private static List<String> createSQL(String file) throws Exception {
List<String> listSQL = new ArrayList<String>();
BufferedReader br = null;
InputStreamReader fr = null;
InputStream is = null;
int i;//表名的第一个字符位置
int k;//表名单最后一个字符的位置
String tableName;
try {
is = SqliteSQLGenerator.class.getResourceAsStream(file);
fr = new InputStreamReader(is);
br = new BufferedReader(fr);
String rec = null;//一行
while ((rec = br.readLine()) != null) {
rec = rec.toLowerCase();
i = rec.indexOf("from ", 1) + 5;
k = rec.indexOf(" ", i);
if (k == -1) {
k = rec.length();
}
;
tableName = rec.substring(i, k);
tableList.add(tableName);
//获取所有查询语句
listSQL.add(rec.toString());
}
} finally {
if (br != null) {
br.close();
}
if (fr != null) {
fr.close();
}
if (is != null) {
is.close();
}
}
return listSQL;
}
/**
* 创建insertsql.txt并导出数据
*/
private static void createFile() {
File file = new File(filePath);
if (!file.exists()) {
try {
file.createNewFile();
} catch (IOException e) {
System.out.println("创建文件名失败!!");
e.printStackTrace();
}
}
FileWriter fw = null;
BufferedWriter bw = null;
try {
fw = new FileWriter(file);
bw = new BufferedWriter(fw);
if (insertList.size() > 0) {
for (int i = 0; i < insertList.size(); i++) {
bw.append(insertList.get(i));
bw.append("\n");
}
}
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
bw.close();
fw.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}