替换字符串中的“独立字符”

package com.metasoft.framework.si.eai.db;

import java.util.HashSet;
import java.util.Iterator;

import com.metasoft.framework.si.eai.parse.FieldMapping;
import com.metasoft.framework.si.eai.parse.TableMapping;
import com.metasoft.framework.si.eai.parse.TableMappingHelper;
/**
 * 
 * @author zr.peng
 * @deprecated
 * @since 2008-4-14
 */
public class MetaDataToU8Helper {
	/**
	 * 把metasql中的SQL替换成U8系统中的SQl
	 * @param sql 
	 * 			Meta中的处理SQL 语句
	 * @param map
	 * 			表间映射关系对象
	 * @return 
	 */
	public static String transformMetaSqlToU8Sql(String sql, TableMapping map) {
		String sqlTrans;
		sqlTrans = replace(sql, map.getFrom_table(), map.getTo_table());
		HashSet fieldMappings = map.getFieldMapping();
		Iterator it = fieldMappings.iterator();
		while (it.hasNext()) {
			FieldMapping fieldMapping = (FieldMapping) it.next();
			String from_field = fieldMapping.getFrom_field();
			String to_field = fieldMapping.getTo_field();
			sqlTrans = replace(sqlTrans, from_field, to_field);
		}
		return sqlTrans;
	}
	/**
	 * 替换
	 * @param sql 要处理的字符串
	 * @param from_field 被替换的字符
	 * @param to_field   替换的字符
	 * @return
	 */
	private static String replace(String sql, String from_field, String to_field) {
		String sqlTrans = sql;
		int sqlLen = sqlTrans.length();
		int from_fieldLen = from_field.length();
		int top = sqlLen - from_fieldLen;
		for (int i = 0; i < top;) {
			/*if (sqlTrans.substring(i, i + 6).equalsIgnoreCase("values")) {
				break;
			}*/
			String temp = sqlTrans.substring(i, from_fieldLen + i);
			if (temp.equals(from_field)) {
				if (leftAndRightAllOK(sqlTrans, temp,i)) {
					String left = sqlTrans.substring(0, i);
					String right = sqlTrans.substring(i + from_fieldLen);
					sqlTrans = left.concat(to_field).concat(right);
					top = sqlTrans.length() - from_fieldLen;
					i = i + to_field.length();
				} else {
					i++;
				}
			} else {
				i++;
			}
		}
		return sqlTrans;
	}
	/**
	 * 判断指定sql字符串 中subStr 子串前后是否是合适的字符，用以判断他是否是一个独立的串
	 * @param sql
	 * @param subStr 
	 * @param subFirstIndex 	
	 *  		子串subStr第一个字符在 字串串sql中的位置
	 * @return
	 */
	private static boolean leftAndRightAllOK(String sql, String subStr,int subFirstIndex) {
		boolean leftAndRightOK = false;	
		char leftChar = sql.charAt(subFirstIndex-1);
		String left = Character.toString(leftChar);

		char rightChar = sql.charAt(subFirstIndex+subStr.length());
		String right = Character.toString(rightChar);

		if (left.matches("[^a-zA-Z]") && right.matches("[^a-zA-Z]")) {
			leftAndRightOK = true;
		}
		return leftAndRightOK;
	} 
	//单元测试
	public static void main(String[] args) {
		
		TableMapping map = (TableMapping) TableMappingHelper.getTablMapping(
				"purchaseorder_SO_SOMain",
				"src/com/metasoft/framework/si/eai/t2txml/purchaseorderdetail_SO_SODetails_table.xml",
				"src/com/metasoft/framework/si/eai/t2txml/purchaseorderdetail_SO_SODetails_field.xml");
		
		String insrtSql = "insert into purchaseorder (id,created,sname,updatedby," +
		"emaudit,updated,jfgl,scode,iddep,createdby,idowner,ckzh) " +
		"values('402880d8193bfb4a01193bfeef400328','2008-04-11 13:39:52.734','bbbbbbbb'," +
		"'402881e618ffd8d80119006f110d1983','402880900bb2d155010bb2fcd9ec04ec'," +
		"'2008-04-11 13:39:52.734','402881d8192d101201192d6fba267dcc','bb'," +
		"'402881e618ffd8d80119002f148b0ae5','402881e618ffd8d80119006f110d1983'," +
		"'402881e618ffd8d80119006f110d1983','402881d8192dbda401192e3f1b814403');";
		String sqlTrans = MetaDataToU8Helper.transformMetaSqlToU8Sql(insrtSql, map);
		System.out.println(insrtSql);
		System.out.println(sqlTrans);
		
		String selctSql="select purchaseorder.id purchaseorder_id , " +
				" purchaseorder.scode purchaseorder_scode, " +
				" purchaseorder.sname purchaseorder_sname, " +
				" purchaseorder.chmc purchaseorder_chmc, " +
				" purchaseorder.idowner purchaseorder_idowner," +
				" idowner_ref.sname purchaseorder_idowner_ref, " +
				" purchaseorder.dbtotalmoney purchaseorder_dbtotalmoney, " +
				" purchaseorder.insurance purchaseorder_insurance, " +
				" purchaseorder.total purchaseorder_total, " +
				" purchaseorder.zjf purchaseorder_zjf, purchaseorder.iddep " +
				" purchaseorder_iddep, iddep_ref.sname purchaseorder_iddep_ref" +
				" from purchaseorder purchaseorder ";
		String sqlTrans2 = MetaDataToU8Helper.transformMetaSqlToU8Sql(selctSql, map);
		System.out.println(selctSql);
		System.out.println(sqlTrans2);
	}
}

评论

1 楼 laitaogood 2010-01-27  

这代码看着真舒服