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(); } } } /** * 连接数据库 创建statement对象 * * @param driver * @param url * @param UserName * @param Password */ public static void connectSQL(String driver, String url, String UserName, String Password) { try { Class.forName(driver).newInstance(); conn = DriverManager.getConnection(url, UserName, Password); sm = conn.createStatement(); } catch (Exception e) { e.printStackTrace(); } } /** * 执行sql并返回插入sql * * @param conn * @param sm * @param listSQL * @throws java.sql.SQLException */ public static void executeSQL(Connection conn, Statement sm, List listSQL, List listTable) throws SQLException { List<String> insertSQL = new ArrayList<String>(); ResultSet rs = null; try { rs = getColumnNameAndColumeValue(sm, listSQL, listTable, rs); } catch (SQLException e) { e.printStackTrace(); } finally { rs.close(); sm.close(); conn.close(); } } /** * 获取列名和列值 * * @param sm * @param listSQL * @param rs * @return * @throws java.sql.SQLException */ private static ResultSet getColumnNameAndColumeValue(Statement sm, List listSQL, List ListTable, ResultSet rs) throws SQLException { for (int j = 0; j < listSQL.size(); j++) { String sql = String.valueOf(listSQL.get(j)); rs = sm.executeQuery(sql); ResultSetMetaData rsmd = rs.getMetaData(); int columnCount = rsmd.getColumnCount(); while (rs.next()) { StringBuffer ColumnName = new StringBuffer(); StringBuffer ColumnValue = new StringBuffer(); for (int i = 1; i <= columnCount; i++) { String value = rs.getString(i); if (i == columnCount) { ColumnName.append(rsmd.getColumnName(i)); if (Types.CHAR == rsmd.getColumnType(i) || Types.VARCHAR == rsmd.getColumnType(i) || Types.LONGVARCHAR == rsmd.getColumnType(i)) { if (value == null) { ColumnValue.append("null"); } else { ColumnValue.append("'").append(value).append("'"); } } else if (Types.SMALLINT == rsmd.getColumnType(i) || Types.INTEGER == rsmd.getColumnType(i) || Types.BIGINT == rsmd.getColumnType(i) || Types.FLOAT == rsmd.getColumnType(i) || Types.DOUBLE == rsmd.getColumnType(i) || Types.NUMERIC == rsmd.getColumnType(i) || Types.DECIMAL == rsmd.getColumnType(i)) { if (value == null) { ColumnValue.append("null"); } else { ColumnValue.append(value); } } else if (Types.DATE == rsmd.getColumnType(i) || Types.TIME == rsmd.getColumnType(i) || Types.TIMESTAMP == rsmd.getColumnType(i)) { if (value == null) { ColumnValue.append("null"); } else { ColumnValue.append("timestamp'").append(value).append("'"); } } else { if (value == null) { ColumnValue.append("null"); } else { ColumnValue.append(value); } } } else { ColumnName.append(rsmd.getColumnName(i) + ","); if (Types.CHAR == rsmd.getColumnType(i) || Types.VARCHAR == rsmd.getColumnType(i) || Types.LONGVARCHAR == rsmd.getColumnType(i)) { if (value == null) { ColumnValue.append("null,"); } else { ColumnValue.append("'").append(value).append("',"); } } else if (Types.SMALLINT == rsmd.getColumnType(i) || Types.INTEGER == rsmd.getColumnType(i) || Types.BIGINT == rsmd.getColumnType(i) || Types.FLOAT == rsmd.getColumnType(i) || Types.DOUBLE == rsmd.getColumnType(i) || Types.NUMERIC == rsmd.getColumnType(i) || Types.DECIMAL == rsmd.getColumnType(i)) { if (value == null) { ColumnValue.append("null,"); } else { ColumnValue.append(value).append(","); } } else if (Types.DATE == rsmd.getColumnType(i) || Types.TIME == rsmd.getColumnType(i) || Types.TIMESTAMP == rsmd.getColumnType(i)) { if (value == null) { ColumnValue.append("null,"); } else { ColumnValue.append("timestamp'").append(value).append("',"); } } else { if (value == null) { ColumnValue.append("null,"); } else { ColumnValue.append(value).append(","); } } } } //System.out.println(ColumnName.toString()); //System.out.println(ColumnValue.toString()); insertSQL(ListTable.get(j).toString(), ColumnName, ColumnValue); } } return rs; } /** * 拼装insertsql 放到全局list里面 * * @param ColumnName * @param ColumnValue */ private static void insertSQL(String TableName, StringBuffer ColumnName, StringBuffer ColumnValue) { StringBuffer insertSQL = new StringBuffer(); insertSQL.append(insert).append(" ").append(TableName).append("(").append(ColumnName.toString()) .append(")").append(values).append("(").append(ColumnValue.toString()).append(");"); insertList.add(insertSQL.toString()); System.out.println(insertSQL.toString()); } public static void main(String[] args) throws Exception { //String file1 = "/config/export_sqlite_data_clear.cfg"; //executeSelectSQLFile(file1, null); String file2 = "/config/export_sqlite_data_select.cfg"; executeSelectSQLFile(file2, null); } }
select * from t_chapter select * from t_question_type
使用中目前未发现什么问题,如有BUG,请各位大神改进。
原文地址:http://blog.csdn.net/internetroot/article/details/39322933