生成ibatis配置文件SqlMap中的各项语句 -

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生成ibatis配置文件SqlMap中的各项语句

博客分类：

JAVA

java ibatis

由于项目使用ibatis，众所周知的原因，配置文件很是烦琐，尤其是数据库字段通常情况下又不与实体中的变量名相同，所以进行数据操作时就要进行映射。这东西配置起来还是比较烦，于是写了个工具类来生成一下，留着备用。

例如，数据库的表名及部分字段是这样的

都是大写的且使用下划线分割，然后我是使用myeclipse DB Browser连接数据库并通过hibernate 反向生成实体类，部分如下

public class CnfFeesConfig implements java.io.Serializable {

	private static final long serialVersionUID = -5883040369836437293L;
	private String sysConfigId;
	private String versionId;
	private String itemId;
	private String itemNameCn;
	private String itemNameEn;
        //get、set
}

接下来就是转换的工具类了，代码很简单，就是通过类全路径装载类，取得类的信息，比如类名，变量列表等，然后做转换，组装。最后输出在控制台，拷过去小做修改就行。

package test.ibatis;

import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.dom4j.Document;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;

/**
 * 用于生成ibatis对应的各项语句,输出到控制台
 */
public class GenerateIbatisSql {

	/**
	 * 生成别名及resultMap 
	 * @param getSqlClassName 完整的类名称
	 * @param extendMap 父map
	 */
	public static void generateMap(String getSqlClassName, String extendMap)
		throws InstantiationException, IllegalAccessException,
		ClassNotFoundException {

		Class<?> cls = Class.forName(getSqlClassName);
		
		Document document = DocumentHelper.createDocument();
		Element rootElement = document.addElement("sqlMap");
		
		String className = cls.getName();
		String clsName = cls.getSimpleName();
	
		Element typeElement = rootElement.addElement("typeAlias");
		typeElement.addAttribute("alias", clsName + "Class");
		typeElement.addAttribute("type", className);
	
		Element subElement = rootElement.addElement("resultMap");
		subElement.addAttribute("id", clsName + "Map");
		subElement.addAttribute("class", clsName + "Class");
		
		if (null != extendMap)
			subElement.addAttribute("extends", extendMap);
	
		Field[] fields = cls.getDeclaredFields();
		for (Field field : fields) {
			if (!field.getName().equals("serialVersionUID")) {
				Element resultElement = subElement.addElement("result");
	
				String name = field.getName();
				name = trandslate(name);
				
				resultElement.addAttribute("property", field.getName());
				resultElement.addAttribute("column", name);
			}
		}
		
		System.out.println(document.asXML());
	}

	/**
	 * 生成选择语句,只生成了字段
	 */
	public static void generateSelectSql(String getSqlClassName,
			String tableAlias) throws ClassNotFoundException,
			InstantiationException, IllegalAccessException {

		Class<?> cls = Class.forName(getSqlClassName);

		Field[] fields = cls.getDeclaredFields();
		for (Field field : fields) {
			if (!field.getName().equals("serialVersionUID")) {
				
				String name = field.getName();
				name = trandslate(name);
				
				System.out.println(tableAlias + "." + name + ",");
			}
		}
	}

	
	/**
	 * 生成update语句
	 */
	public static void generateUpdateSql(String className, String symbol)
			throws ClassNotFoundException,
			InstantiationException, IllegalAccessException {
		
		Class<?> cls = Class.forName(className);
		String clsName = cls.getSimpleName();

		StringBuilder build = new StringBuilder();
		build.append("<update id=\"update").append(clsName).append("\">\n");
		clsName = trandslate(clsName);
		build.append("UPDATE ").append(clsName.toUpperCase()).append(" SET \n");
		
		//转换变量名
		Field[] fields = cls.getDeclaredFields();
		for (Field field : fields) {
			if (!field.getName().equals("serialVersionUID")) {
				
				String name = field.getName();
				name = trandslate(name);
				
				build.append(name.toUpperCase()).append("=").append(symbol)
					.append(field.getName()).append(symbol).append(",");
			}
		}
		String result = build.toString();
		result = result.substring(0, result.length()-1);
		result += "\n</update>";
		
		System.out.println(result);
	}

	/**
	 * 生成insert语句
	 */
	public static void generateInsertSql(String className, String symbol) 
			throws ClassNotFoundException, InstantiationException, 
			IllegalAccessException {
		
		Class<?> cls = Class.forName(className);
		String clsName = cls.getSimpleName();	//类名
		
		StringBuilder build = new StringBuilder();
		
		build.append("<insert id=\"insert").append(clsName).append("\">\n");
		
		clsName = trandslate(clsName);
		
		build.append("INSERT INTO ").append(clsName.toUpperCase());
		
		List<String> fieldList = new ArrayList<String>();
		List<String> valueList = new ArrayList<String>();

		Field[] fields = cls.getDeclaredFields();
		for (Field field : fields) {
			if (!field.getName().equals("serialVersionUID")) {
				
				String name = field.getName();
				name = trandslate(name);
				
				fieldList.add(name);
				valueList.add(field.getName());
			}
		}

		build.append(" (\n");
		for (int i=0,size=fieldList.size(); i<size; i++) {
			build.append( fieldList.get(i).toUpperCase() );
			if( i < size-1 )
				build.append(",");
		}

		build.append("\n) values (\n");
		for (int i=0,size=valueList.size(); i<size; i++) {
			build.append(symbol).append(valueList.get(i)).append(symbol);
			if( i < size-1 )
				build.append(",");
		}
		build.append("\n)\n</insert>");
		
		System.out.println(build.toString());
	}

	/**变量名的转换，转成表的字段名*/
	private static String trandslate(String name){
		
		//匹配大写
		Pattern pattern = Pattern.compile("[A-Z]");
		Matcher matcher = pattern.matcher(name);
		while (matcher.find()) {
			if (matcher.start() == 0)
				name = name.replace(matcher.group(), matcher.group().toLowerCase());
			else
				name = name.replace(matcher.group(), "_" + matcher.group().toLowerCase());//替换下划线
		}
		return name;
	}

	public static void main(String[] args) {

		//类的全路径名
		String className = "com.cmhit.szps.model.cnf.CnfFeesConfig";
		//标识符号
		String symbol = "";
		
		try {
			generateMap(className, null);			//生成别名及resultMap
			
//			symbol = "t";
//			generateSelectSql(className, symbol);	//生成查询语句
			
//			symbol = "#";
//			generateInsertSql(className, symbol);	//生成插入语句
//			generateUpdateSql(className,symbol);	//生成更新语句
			
		} catch (ClassNotFoundException e) {
			e.printStackTrace();
		} catch (InstantiationException e) {
			e.printStackTrace();
		} catch (IllegalAccessException e) {
			e.printStackTrace();
		}

	}

}

结果

<?xml version="1.0" encoding="UTF-8"?>
<sqlMap>
<typeAlias alias="CnfFeesConfigClass" type="com.cmhit.szps.model.cnf.CnfFeesConfig"/>
<resultMap id="CnfFeesConfigMap" class="CnfFeesConfigClass">
<result property="sysConfigId" column="sys_config_id"/>
<result property="versionId" column="version_id"/>
<result property="itemId" column="item_id"/>
</resultMap>
</sqlMap>