根据数据库表生成实体类PO

在实际开发中经常会先设计表，在根据表设计生成对应数据库表，再根据数据库表来编写对应实体代码。为了减少手动开发工作量已经维护表与实体对应一致性，一般使用自动生成实体。一般常用模板工具生成。这里使用Java代码生成，也是一种办法。

1、MySQL数据库

import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Date;

/**
 * 根据数据库表结构生成相应的JavaBean 思路 1、创建数据库连接 2、获取数据库表、表注释 3、获取数据库表中字段名、字段类型、字段注释
 * 4、构建StringBuffer缓存 5、写入文件 6、关闭连接、输入流等等
 */
public class GenEntityMySql {
	private String packageOutPath = "com.gtafe.dorm.po";// 指定实体生成所在包的路径
	private String dirPath = "";// 输出文件地址
	private String authorName = "**";// 作者名字
	private String[] tablePre = { "w_" };//表前缀【为空时输出库中所有表】
	private String[] tableNames;// 表名
	private String[] colsPre = {};
	private String[] colnames; // 列名数组
	private String[] colTypes; // 列名类型数组
	private int[] colSizes; // 列名大小数组
	private boolean f_util = false; // 是否需要导入包java.util.*
	private boolean f_sql = false; // 是否需要导入包java.sql.*

	// 数据库连接
	private static final String URL = "jdbc:mysql://192.168.21.236:3307/ecloud";
	private static final String NAME = "root";
	private static final String PASS = "root";
	private static final String DRIVER = "com.mysql.jdbc.Driver";
	private Connection con = null;
	private Statement pStemt = null;
	private ResultSet rs = null;
	private ResultSetMetaData rsmd = null;

	/**
	 * 出口
	 */
	public static void main(String[] args) {
		new GenEntityMySql();
	}

	public GenEntityMySql() {
		connect();
		getAllTables();
		System.out.println("success");
	}

	/**
	 * 1、创建数据库连接
	 */
	private void connect() {
		try {
			Class.forName(DRIVER);
			con = DriverManager.getConnection(URL, NAME, PASS);
			pStemt = (Statement) con.createStatement();
		} catch (ClassNotFoundException | SQLException e) {
			e.printStackTrace();
		}
	}

	private void colseConnect() {
		try {
			if (con != null) {
				con.close();
				con = null;
			}
			if (pStemt != null) {
				pStemt.close();
				pStemt = null;
			}
		} catch (SQLException e) {
			e.printStackTrace();
		}

	}

	/**
	 * 获取所有表名
	 */
	private void getAllTables() {
		String sql = "SELECT TABLE_NAME FROM information_schema.tables where table_schema='"
				+ URL.substring(URL.lastIndexOf("/") + 1) + "'";
		try {
			rs = pStemt.executeQuery(sql);
			String s = "";
			while (rs.next()) {
				s = s + rs.getString("TABLE_NAME") + ",";
			}
			tableNames = s.substring(0, s.length() - 1).split(",");
			for (String tableName : tableNames) {
				// 如果设置了表开头，则仅处理表开头的
				if (tablePre.length > 0) {
					boolean flag = false;
					for (String pre : tablePre) {
						if (tableName.startsWith(pre)) {
							flag = true;
						}
					}
					if (flag) {
						getTableInfo(tableName);
					}
				} else {
					getTableInfo(tableName);
				}
                f_util = false; 
				f_sql = false;
			}
		} catch (SQLException e) {
			e.printStackTrace();
		} finally {
			colseConnect();
		}
	}

	/**
	 * 获取单个数据库表信息
	 */
	private void getTableInfo(String tableName) {
		int size = 0;
		String sql = "SELECT * FROM " + tableName;
		try {
			rs = pStemt.executeQuery(sql);
			rsmd = rs.getMetaData();
			size = rsmd.getColumnCount();
			colnames = new String[size];
			colTypes = new String[size];
			colSizes = new int[size];
			for (int i = 0; i < size; i++) {
				colnames[i] = rsmd.getColumnName(i + 1);
				colTypes[i] = rsmd.getColumnTypeName(i + 1);

				if (colTypes[i].equalsIgnoreCase("date") || colTypes[i].equalsIgnoreCase("timestamp")) {
					f_util = true;
				}
				if (colTypes[i].equalsIgnoreCase("blob") || colTypes[i].equalsIgnoreCase("char")) {
					f_sql = true;
				}
				colSizes[i] = rsmd.getColumnDisplaySize(i + 1);
			}
			// 规范化表名
			String normTableName = normTableName(tableName);
			// 获取单张数据库表注释
			String tableComment = getTableComment(tableName);
			// 获取单张数据库表的所有列信息
			StringBuffer tempSb = getColsInfo(tableName);
			// 生成JavaBean文件
			genFile(normTableName, getSb(tableName, normTableName, tableComment, tempSb));
		} catch (SQLException e) {
			e.printStackTrace();
		}
	}

	/**
	 * 规范类名
	 *
	 * @param tableName
	 * @return
	 */
	public String normTableName(String tableName) {
		String result = "";
		for (String temp : tablePre) {
			int index = tableName.indexOf(temp);
			if (index == 0) {
				if(!temp.equals(tableName)){//(单名字与前缀相同时，按默认处理)
					tableName = tableName.substring(index + temp.length());
				}
				String[] names = tableName.split("_");
				if (null != names && names.length > 0) {
					for (String name : names) {
						result += captureName(name.toLowerCase());
					}
				}
			}
		}
		return result;
	}

	/**
	 * 获取单张数据库表注释
	 *
	 * @param tableName
	 * @return
	 */
	private String getTableComment(String tableName) {
		String str = "";
		String sql = "SELECT table_comment FROM information_schema.tables where table_schema='"
				+ URL.substring(URL.lastIndexOf("/") + 1) + "' and table_name = '" + tableName + "'";
		try {
			rs = pStemt.executeQuery(sql);
			while (rs.next()) {
				str = rs.getString("table_comment");
				if (null != str && str.indexOf("\r\n") != -1) {
					str = str.replace("\r\n", "");
				}
				if (null != str && str.indexOf("\n") != -1) {
					str = str.replace("\n", "");
				}
			}
		} catch (SQLException e) {
			e.printStackTrace();
		}
		return str;
	}

	/**
	 * 获取单张数据库表的所有列信息
	 *
	 * @param tableName
	 */
	private StringBuffer getColsInfo(String tableName) {
		StringBuffer temp = new StringBuffer();

		processAllAttrs(tableName, temp);// 属性
		processAllMethod(temp);// get set方法

		return temp;
	}

	/**
	 * 生成所有属性
	 */
	private void processAllAttrs(String tableName, StringBuffer sb) {
		for (int i = 0; i < colnames.length; i++) {
			// 获取注释
			if (i == 0) {
				sb.append("\t@Id\r\n");
				sb.append("\t@GenericGenerator(name = \"session_info_uuid_gen\", strategy = \"assigned\")\r\n");
				sb.append("\t@GeneratedValue(generator = \"session_info_uuid_gen\")\r\n");
			}
			sb.append("\t//" + getColComment(tableName, colnames[i]) + "\r\n");
			// 添加注解
			sb.append("\t@Column(name = \"" + colnames[i] + "\")\r\n");
			// 获取属性
			sb.append("\tprivate " + sqlType2JavaType(colTypes[i]) + " " + getColsName(colnames[i]) + ";\r\n");

			sb.append("\t\r\n");
		}
	}

	/**
	 * 生成所有方法
	 */
	private void processAllMethod(StringBuffer sb) {
		for (int i = 0; i < colnames.length; i++) {
			sb.append("\tpublic void set" + captureName(getColsName(colnames[i])) + "(" + sqlType2JavaType(colTypes[i])
					+ " " + getColsName(colnames[i]) + "){\r\n");
			sb.append("\t\tthis." + getColsName(colnames[i]) + "=" + getColsName(colnames[i]) + ";\r\n");
			sb.append("\t}\r\n");
			sb.append("\tpublic " + sqlType2JavaType(colTypes[i]) + " get" + captureName(getColsName(colnames[i]))
					+ "(){\r\n");
			sb.append("\t\treturn " + getColsName(colnames[i]) + ";\r\n");
			sb.append("\t}\r\n");
		}
	}

	/**
	 * 获取列类型
	 *
	 * @param sqlType
	 * @return
	 */
	private String sqlType2JavaType(String sqlType) {
		if (sqlType.equalsIgnoreCase("bit")) {
			return "Boolean";
		} else if (sqlType.equalsIgnoreCase("tinyint")) {
			return "Byte";
		} else if (sqlType.equalsIgnoreCase("smallint")) {
			return "Short";
		} else if (sqlType.equalsIgnoreCase("int")) {
			return "Integer";
		} else if (sqlType.equalsIgnoreCase("bigint")) {
			return "Long";
		} else if (sqlType.equalsIgnoreCase("float")) {
			return "Float";
		} else if (sqlType.equalsIgnoreCase("decimal") || sqlType.equalsIgnoreCase("numeric")
				|| sqlType.equalsIgnoreCase("real") || sqlType.equalsIgnoreCase("money")
				|| sqlType.equalsIgnoreCase("smallmoney")) {
			return "Double";
		} else if (sqlType.equalsIgnoreCase("varchar") || sqlType.equalsIgnoreCase("char")
				|| sqlType.equalsIgnoreCase("nvarchar") || sqlType.equalsIgnoreCase("nchar")
				|| sqlType.equalsIgnoreCase("text")) {
			return "String";
		} else if (sqlType.equalsIgnoreCase("datetime")) {
			return "Date";
		} else if (sqlType.equalsIgnoreCase("image")) {
			return "Blod";
		}
		return "String";
	}

	/**
	 * 获取列名及驼峰处理
	 *
	 * @param str
	 * @return
	 */
	private String getColsName(String str) {
		if (colsPre.length > 0) {
			for (String temp : colsPre) {
				int preIndex = str.indexOf(temp);
				if (preIndex >= 0) {
					str = str.substring(preIndex + temp.length());
				}
			}
		}
		return UnderlineToHump(str);
	}

	/**
	 * 获取列注释
	 *
	 * @param tableName
	 * @param columnName
	 * @return
	 */
	private String getColComment(String tableName, String columnName) {
		String str = "";
		String sql = "select column_comment from  information_schema.columns where table_schema='"
				+ URL.substring(URL.lastIndexOf("/") + 1) + "' and table_name='" + tableName + "' and column_name= '"
				+ columnName + "'";
		try {
			rs = pStemt.executeQuery(sql);
			while (rs.next()) {
				str = rs.getString("column_comment");
				if (null != str && str.indexOf("\r\n") != -1) {
					str = str.replace("\r\n", "");
				}
				if (null != str && str.indexOf("\n") != -1) {
					str = str.replace("\n", "");
				}
			}
		} catch (SQLException e) {
			e.printStackTrace();
		}
		return str;
	}

	/**
	 * 构建StringBuffer缓存
	 *
	 * @param tableName
	 * @param tableComment
	 * @param colSb
	 * @return
	 */
	private StringBuffer getSb(String tableName, String normTableName, String tableComment, StringBuffer colSb) {
		StringBuffer sb = new StringBuffer();
		sb.append("package " + this.packageOutPath + ";\r\n");
		// 判断是否导入工具包
		if (f_util) {
			sb.append("import java.util.Date;\r\n");
		}
		if (f_sql) {
			sb.append("import java.sql.*;\r\n");
		}
		// 添加通用引用
		sb.append("import javax.persistence.Column;\r\n");
		sb.append("import javax.persistence.Entity;\r\n");
		sb.append("import javax.persistence.GeneratedValue;\r\n");
		sb.append("import javax.persistence.Id;\r\n");
		sb.append("import javax.persistence.Table;\r\n");
		sb.append("import org.hibernate.annotations.GenericGenerator;\r\n");
		sb.append("import java.io.Serializable;\r\n");

		sb.append("\r\n");
		// 注释部分
		sb.append("/**\r\n");
		sb.append("* " + normTableName + " 实体类        " + tableComment + "\r\n");
		sb.append("* " + new Date() + "\r\n");
		sb.append("* @author " + this.authorName + "\r\n");
		sb.append("*/ \r\n");
		// 注解
		sb.append("@Entity\r\n");
		sb.append("@Table(name = \"" + tableName + "\")\r\n");
		// 实体部分
		sb.append("public class " + normTableName + " implements Serializable {\r\n");
		sb.append("\tprivate static final long serialVersionUID = 1L;\r\n");
		sb.append(colSb);
		sb.append("}\r\n");
		return sb;
	}

	/**
	 * 生成JavaBean文件
	 *
	 * @param content
	 */
	private void genFile(String tableName, StringBuffer content) {
		try {
			File directory = new File("");
			String path = "".equals(dirPath) ? directory.getAbsolutePath() + "/src/main/java/" : dirPath;
			path = path + this.packageOutPath.replace(".", "/") + "/";

			GenEntityMySql.dirExists(path);

			String outputPath = path + tableName + ".java";
			// GenEntityMySql.fileExists(outputPath);
			FileWriter fw = new FileWriter(outputPath);
			PrintWriter pw = new PrintWriter(fw);
			pw.println(content);
			pw.flush();
			pw.close();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

	/**
	 * 首字母大写
	 * 
	 * @param name
	 * @return
	 */
	public static String captureName(String name) {
		char[] cs = name.toCharArray();
		if (cs[0] >= 'a' && cs[0] <= 'z') {
			cs[0] -= 32;
		}
		return String.valueOf(cs);
	}

	/**
	 * 判断文件是否存在
	 */
	public static void fileExists(String path) {
		File file = new File(path);
		if (file.exists()) {
			// System.out.println("file exists");
		} else {
			System.out.println("file not exists, create it ...");
			try {
				file.createNewFile();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
	}

	/**
	 * 判断文件夹是否存在
	 */
	public static void dirExists(String path) {
		File file = new File(path);
		if (file.exists()) {
			if (file.isDirectory()) {
				// System.out.println("dir exists");
			} else {
				System.out.println("the same name file exists, can not create dir");
			}
		} else {
			System.out.println("dir not exists, create it ...");
			file.mkdirs();
		}
	}

	/**
	 * 下划线命名转为驼峰命名
	 */
	public static String UnderlineToHump(String para) {
		StringBuilder result = new StringBuilder();
		String a[] = para.split("_");
		for (String s : a) {
			if (result.length() == 0) {
				result.append(s.toLowerCase());
			} else {
				result.append(s.substring(0, 1).toUpperCase());
				result.append(s.substring(1).toLowerCase());
			}
		}
		return result.toString();
	}

	/**
	 * 驼峰命名转为下划线命名
	 */
	public static String HumpToUnderline(String para) {
		StringBuilder sb = new StringBuilder(para);
		int temp = 0;// 定位
		for (int i = 0; i < para.length(); i++) {
			if (Character.isUpperCase(para.charAt(i))) {
				sb.insert(i + temp, "_");
				temp += 1;
			}
		}
		return sb.toString().toUpperCase();
	}
}

 

2、Oracle数据库

import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Date;

/**
 * 根据数据库表结构生成相应的JavaBean
 *
 * 思路 1、创建数据库连接 2、获取数据库表、表注释 3、获取数据库表中字段名、字段类型、字段注释 4、构建StringBuffer缓存 5、写入文件
 * 6、关闭连接、输入流等等
 */
public class GenEntityOracle {
	private String packageOutPath = "com.gtafe.dorm.po";// 指定实体生成所在包的路径
	private String dirPath = "";// 输出文件地址
	private String authorName = "**";// 作者名字
	private String[] tableNames;
	private String[] tablePre = { "TJOB_" };//表前缀【为空时输出库中所有表】
	private String[] colsPre = {};
	private String[] colnames; // 列名数组
	private String[] colTypes; // 列名类型数组
	private int[] colSizes; // 列名大小数组
	private boolean f_util = false; // 是否需要导入包java.util.*
	private boolean f_sql = false; // 是否需要导入包java.sql.*

	// 数据库连接
	private static final String URL = "jdbc:oracle:thin:@10.1.137.12:1521:orcl";
	private static final String NAME = "UGTA_NEW";
	private static final String PASS = "GTAgta123";
	private static final String DRIVER = "oracle.jdbc.driver.OracleDriver";
	private Connection con = null;
	private Statement pStemt = null;
	private ResultSet rs = null;
	private ResultSetMetaData rsmd = null;

	/**
	 * 出口
	 */
	public static void main(String[] args) {
		new GenEntityOracle();
	}

	public GenEntityOracle() {
		connect();
		getAllTables();
		System.out.println("success");
	}

	/**
	 * 1、创建数据库连接
	 */
	private void connect() {
		try {
			Class.forName(DRIVER);
			con = DriverManager.getConnection(URL, NAME, PASS);
			pStemt = (Statement) con.createStatement();
		} catch (ClassNotFoundException | SQLException e) {
			e.printStackTrace();
		}
	}

	private void colseConnect() {
		try {
			if (con != null) {
				con.close();
				con = null;
			}
			if (pStemt != null) {
				pStemt.close();
				pStemt = null;
			}
		} catch (SQLException e) {
			e.printStackTrace();
		}

	}

	/**
	 * 获取所有表名
	 */
	private void getAllTables() {
		String sql = "SELECT TABLE_NAME FROM USER_TABLES";
		try {
			rs = pStemt.executeQuery(sql);
			String s = "";
			while (rs.next()) {
				s = s + rs.getString("TABLE_NAME") + ",";
			}
			tableNames = s.substring(0, s.length() - 1).split(",");
			for (String tableName : tableNames) {
				// 如果设置了表开头，则仅处理表开头的
				if (tablePre.length > 0) {
					boolean flag = false;
					for (String pre : tablePre) {
						if (tableName.startsWith(pre)) {
							flag = true;
						}
					}
					if (flag) {
						getTableInfo(tableName);
					}
				} else {
					getTableInfo(tableName);
				}
				f_util = false; 
				f_sql = false;
			}
		} catch (SQLException e) {
			e.printStackTrace();
		} finally {
			colseConnect();
		}
	}

	/**
	 * 获取单个数据库表信息
	 */
	private void getTableInfo(String tableName) {
		int size = 0;
		String sql = "SELECT * FROM " + tableName;
		try {
			rs = pStemt.executeQuery(sql);
			rsmd = rs.getMetaData();
			size = rsmd.getColumnCount();
			colnames = new String[size];
			colTypes = new String[size];
			colSizes = new int[size];
			for (int i = 0; i < size; i++) {
				colnames[i] = rsmd.getColumnName(i + 1);
				colTypes[i] = rsmd.getColumnTypeName(i + 1);

				if (colTypes[i].equalsIgnoreCase("date") || colTypes[i].equalsIgnoreCase("timestamp")) {
					f_util = true;
				}
				if (colTypes[i].equalsIgnoreCase("blob") || colTypes[i].equalsIgnoreCase("char")) {
					f_sql = true;
				}
				colSizes[i] = rsmd.getColumnDisplaySize(i + 1);
			}
			// 规范化表名
			String normTableName = normTableName(tableName);
			// 获取单张数据库表注释
			String tableComment = getTableComment(tableName);
			// 获取单张数据库表的所有列信息
			StringBuffer tempSb = getColsInfo(tableName);
			// 生成JavaBean文件
			genFile(normTableName, getSb(tableName, normTableName, tableComment, tempSb));
		} catch (SQLException e) {
			e.printStackTrace();
		}
	}

	/**
	 * 规范类名
	 *
	 * @param tableName
	 * @return
	 */
	public String normTableName(String tableName) {
		String result = "";
		for (String temp : tablePre) {
			int index = tableName.indexOf(temp);
			if (index >= 0) {
				if(!temp.equals(tableName)){//(单名字与前缀相同时，按默认处理)
					tableName = tableName.substring(index + temp.length());
				}
				String[] names = tableName.split("_");
				if (null != names && names.length > 0) {
					for (String name : names) {
						result += captureName(name.toLowerCase());
					}
				}
			}
		}
		return result;
	}

	/**
	 * 获取单张数据库表注释
	 *
	 * @param tableName
	 * @return
	 */
	private String getTableComment(String tableName) {
		String str = "";
		String sql = "select * from user_tab_comments where table_name = '" + tableName + "'";
		try {
			rs = pStemt.executeQuery(sql);
			while (rs.next()) {
				str = rs.getString("comments");
				if (null != str && str.indexOf("\r\n") != -1) {
					str = str.replace("\r\n", "");
				}
				if (null != str && str.indexOf("\n") != -1) {
					str = str.replace("\n", "");
				}
			}
		} catch (SQLException e) {
			e.printStackTrace();
		}
		return str;
	}

	/**
	 * 获取单张数据库表的所有列信息
	 *
	 * @param tableName
	 */
	private StringBuffer getColsInfo(String tableName) {
		StringBuffer temp = new StringBuffer();

		processAllAttrs(tableName, temp);// 属性
		processAllMethod(temp);// get set方法

		return temp;
	}

	/**
	 * 生成所有属性
	 */
	private void processAllAttrs(String tableName, StringBuffer sb) {
		for (int i = 0; i < colnames.length; i++) {
			// 获取注释
			if (i == 0) {
				sb.append("\t@Id\r\n");
				sb.append("\t@GenericGenerator(name = \"session_info_uuid_gen\", strategy = \"assigned\")\r\n");
				sb.append("\t@GeneratedValue(generator = \"session_info_uuid_gen\")\r\n");
			}
			sb.append("\t//" + getColComment(tableName, colnames[i]) + "\r\n");
			// 添加注解
			sb.append("\t@Column(name = \"" + colnames[i] + "\")\r\n");
			// 获取属性
			sb.append("\tprivate " + sqlType2JavaType(colTypes[i]) + " " + getColsName(colnames[i]) + ";\r\n");

			sb.append("\t\r\n");
		}
	}

	/**
	 * 生成所有方法
	 */
	private void processAllMethod(StringBuffer sb) {
		for (int i = 0; i < colnames.length; i++) {
			sb.append("\tpublic void set" + captureName(getColsName(colnames[i])) + "(" + sqlType2JavaType(colTypes[i])
					+ " " + getColsName(colnames[i]) + "){\r\n");
			sb.append("\t\tthis." + getColsName(colnames[i]) + "=" + getColsName(colnames[i]) + ";\r\n");
			sb.append("\t}\r\n");
			sb.append("\tpublic " + sqlType2JavaType(colTypes[i]) + " get" + captureName(getColsName(colnames[i]))
					+ "(){\r\n");
			sb.append("\t\treturn " + getColsName(colnames[i]) + ";\r\n");
			sb.append("\t}\r\n");
		}
	}

	/**
	 * 获取列类型
	 *
	 * @param sqlType
	 * @return
	 */
	private String sqlType2JavaType(String sqlType) {
		if (sqlType.equalsIgnoreCase("binary_double")) {
			return "Double";
		} else if (sqlType.equalsIgnoreCase("binary_float")) {
			return "Float";
		} else if (sqlType.equalsIgnoreCase("blob")) {
			return "Byte[]";
		} else if (sqlType.equalsIgnoreCase("char") || sqlType.equalsIgnoreCase("nvarchar2")
				|| sqlType.equalsIgnoreCase("varchar2")) {
			return "String";
		} else if (sqlType.equalsIgnoreCase("date") || sqlType.equalsIgnoreCase("timestamp")
				|| sqlType.equalsIgnoreCase("timestamp with local time zone")
				|| sqlType.equalsIgnoreCase("timestamp with time zone")) {
			return "Date";
		} else if (sqlType.equalsIgnoreCase("number")) {
			return "Long";
		}
		return "String";
	}

	/**
	 * 获取列名及驼峰处理
	 *
	 * @param str
	 * @return
	 */
	private String getColsName(String str) {
		if (colsPre.length > 0) {
			for (String temp : colsPre) {
				int preIndex = str.indexOf(temp);
				if (preIndex >= 0) {
					str = str.substring(preIndex + temp.length());
				}
			}
		}
		return UnderlineToHump(str);
	}

	/**
	 * 获取列注释
	 *
	 * @param tableName
	 * @param columnName
	 * @return
	 */
	private String getColComment(String tableName, String columnName) {
		String str = "";
		String sql = "select comments from USER_COL_COMMENTS where table_name= '" + tableName + "' and column_name= '"
				+ columnName + "'";
		try {
			rs = pStemt.executeQuery(sql);
			while (rs.next()) {
				str = rs.getString("comments");
				if (null != str && str.indexOf("\r\n") != -1) {
					str = str.replace("\r\n", "");
				}
				if (null != str && str.indexOf("\n") != -1) {
					str = str.replace("\n", "");
				}
			}
		} catch (SQLException e) {
			e.printStackTrace();
		}
		return str;
	}

	/**
	 * 构建StringBuffer缓存
	 *
	 * @param tableName
	 * @param tableComment
	 * @param colSb
	 * @return
	 */
	private StringBuffer getSb(String tableName, String normTableName, String tableComment, StringBuffer colSb) {
		StringBuffer sb = new StringBuffer();
		sb.append("package " + this.packageOutPath + ";\r\n");
		// 判断是否导入工具包
		if (f_util) {
			sb.append("import java.util.Date;\r\n");
		}
		if (f_sql) {
			sb.append("import java.sql.*;\r\n");
		}
		// 添加通用引用
		sb.append("import javax.persistence.Column;\r\n");
		sb.append("import javax.persistence.Entity;\r\n");
		sb.append("import javax.persistence.GeneratedValue;\r\n");
		sb.append("import javax.persistence.Id;\r\n");
		sb.append("import javax.persistence.Table;\r\n");
		sb.append("import org.hibernate.annotations.GenericGenerator;\r\n");
		sb.append("import java.io.Serializable;\r\n");

		sb.append("\r\n");
		// 注释部分
		sb.append("/**\r\n");
		sb.append("* " + normTableName + " 实体类        " + tableComment + "\r\n");
		sb.append("* " + new Date() + "\r\n");
		sb.append("* @author " + this.authorName + "\r\n");
		sb.append("*/ \r\n");
		// 注解
		sb.append("@Entity\r\n");
		sb.append("@Table(name = \"" + tableName + "\")\r\n");
		// 实体部分
		sb.append("public class " + normTableName + " implements Serializable {\r\n");
		sb.append("\tprivate static final long serialVersionUID = 1L;\r\n");
		sb.append(colSb);
		sb.append("}\r\n");
		return sb;
	}

	/**
	 * 生成JavaBean文件
	 *
	 * @param content
	 */
	private void genFile(String tableName, StringBuffer content) {
		try {
			File directory = new File("");
			String path = "".equals(dirPath) ? directory.getAbsolutePath() + "/src/main/java/" : dirPath;
			path = path + this.packageOutPath.replace(".", "/") + "/";

			GenEntityOracle.dirExists(path);

			String outputPath = path + tableName + ".java";
			// GenEntityOracle.fileExists(outputPath);
			FileWriter fw = new FileWriter(outputPath);
			PrintWriter pw = new PrintWriter(fw);
			pw.println(content);
			pw.flush();
			pw.close();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

	/**
	 * 首字母大写
	 * 
	 * @param name
	 * @return
	 */
	public static String captureName(String name) {
		char[] cs = name.toCharArray();
		if (cs[0] >= 'a' && cs[0] <= 'z') {
			cs[0] -= 32;
		}
		return String.valueOf(cs);
	}

	/**
	 * 判断文件是否存在
	 */
	public static void fileExists(String path) {
		File file = new File(path);
		if (file.exists()) {
			// System.out.println("file exists");
		} else {
			System.out.println("file not exists, create it ...");
			try {
				file.createNewFile();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
	}

	/**
	 * 判断文件夹是否存在
	 */
	public static void dirExists(String path) {
		File file = new File(path);
		if (file.exists()) {
			if (file.isDirectory()) {
				// System.out.println("dir exists");
			} else {
				System.out.println("the same name file exists, can not create dir");
			}
		} else {
			System.out.println("dir not exists, create it ...");
			file.mkdirs();
		}
	}

	/**
	 * 下划线命名转为驼峰命名
	 */
	public static String UnderlineToHump(String para) {
		StringBuilder result = new StringBuilder();
		String a[] = para.split("_");
		for (String s : a) {
			if (result.length() == 0) {
				result.append(s.toLowerCase());
			} else {
				result.append(s.substring(0, 1).toUpperCase());
				result.append(s.substring(1).toLowerCase());
			}
		}
		return result.toString();
	}

	/**
	 * 驼峰命名转为下划线命名
	 */
	public static String HumpToUnderline(String para) {
		StringBuilder sb = new StringBuilder(para);
		int temp = 0;// 定位
		for (int i = 0; i < para.length(); i++) {
			if (Character.isUpperCase(para.charAt(i))) {
				sb.insert(i + temp, "_");
				temp += 1;
			}
		}
		return sb.toString().toUpperCase();
	}
}