TableMapping数据库表实体类对应代码,Java代码库,德仔网

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【Java】 TableMapping数据库表实体类对应
作者:jiucheng / 发布于2014/10/8/ 451

	package org.jiucheng.util;
	
	import java.io.Serializable;
	import java.lang.reflect.Method;
	import java.util.ArrayList;
	import java.util.HashMap;
	import java.util.List;
	import java.util.Map;
	
	import org.jiucheng.entity.BaseEntity;
	
	/**
	*
	* @author 旧城(jiucheng.org@gmail.com)
	*
	*/
	public class TableMapping implements Serializable{
	
	 private static final long serialVersionUID = -3319792150302540890L;
	
	 public final static String DEFAULT_PRIMARY_KEY = "id";
	 private final static Map<Integer, String> strs = new HashMap<Integer, String>();
	 private final static Map<Class<? extends BaseEntity>, TableMapping> pools = new HashMap<Class<? extends BaseEntity>, TableMapping>();
	 public final static String SET = "set";
	 public final static String GET = "get";
	
	 @SuppressWarnings("unused")
	 private Class<? extends BaseEntity> clazz;
	 private String tableName;
	 private String primaryKey;
	 private List<ColumnMapping> columns;
	
	 public static class ColumnMapping implements Serializable{
	
	 private static final long serialVersionUID = -1042725024561237385L;
	
	 private String tableColumn;
	 private String clazzColumn;
	 private String getMethodName;
	 private String setMethodName;
	 private Class<?> clazzType;
	
	 public String getTableColumn() {
	 return tableColumn;
	 }
	
	 public String getGetMethodName() {
	 return getMethodName;
	 }
	
	 public String getSetMethodName() {
	 return setMethodName;
	 }
	
	 public Class<?> getClazzType() {
	 return clazzType;
	 }
	
	 public String getClazzColumn() {
	 return clazzColumn;
	 }
	 }
	
	 public static String getCacheStr(String str) {
	 String s = strs.get(str.hashCode());
	 if(s == null) {
	 strs.put(str.hashCode(), str);
	 s = str;
	 }
	 return s;
	 }
	
	 /**
	 * 获取GetMethod
	 * @param clazz
	 * @param columnName
	 * @return
	 */
	 public static Method getGetMethod(Class<? extends BaseEntity> clazz, String columnName) {
	 TableMapping tm = getTableMapping(clazz);
	 for(ColumnMapping col : tm.columns) {
	 if(col.tableColumn.equals(columnName)) {
	 try {
	 return clazz.getMethod(col.getMethodName);
	 }catch(Exception e) {}
	 }
	 }
	 return null;
	 }
	
	 /**
	 * 获取SetMethod
	 * @param clazz
	 * @param columnName
	 * @return
	 */
	 public static Method getSetMethod(Class<? extends BaseEntity> clazz, String columnName) {
	 TableMapping tm = getTableMapping(clazz);
	 for(ColumnMapping col : tm.columns) {
	 if(col.tableColumn.equals(columnName)) {
	 try {
	 return clazz.getMethod(col.setMethodName, col.clazzType);
	 }catch(Exception e) {}
	 }
	 }
	 return null;
	 }
	
	 /**
	 * 获取table.column
	 * @param clazz
	 * @param m
	 * @return
	 */
	 public static String getColumn(Class<? extends BaseEntity> clazz, Method m) {
	 TableMapping tm = getTableMapping(clazz);
	 String methodName = m.getName();
	 for(ColumnMapping col : tm.columns) {
	 if(col.getMethodName.equals(methodName) || col.setMethodName.equals(methodName)) {
	 return col.tableColumn;
	 }
	 }
	 return null;
	 }
	
	 /**
	 * 获取表名
	 * @param clazz
	 * @return
	 */
	 public static String getTableName(Class<? extends BaseEntity> clazz) {
	 return getTableMapping(clazz).tableName;
	 }
	
	 /**
	 * 获取表中主键字段
	 * @param clazz
	 * @return
	 */
	 public static String getPrimaryKey(Class<? extends BaseEntity> clazz) {
	 return getTableMapping(clazz).primaryKey;
	 }
	
	 private static TableMapping getTableMapping(Class<? extends BaseEntity> clazz) {
	 TableMapping tm = pools.get(clazz);
	 if(tm == null) {
	 tm = load(clazz);
	 }
	 return tm;
	 }
	
	 private static TableMapping load(Class<? extends BaseEntity> clazz) {
	 TableMapping tm = new TableMapping(clazz);
	 TableMapping.pools.put(clazz, tm);
	 return tm;
	 }
	
	 private TableMapping(Class<? extends BaseEntity> clazz) {
	 init(clazz);
	 }
	
	 private void init(Class<? extends BaseEntity> clazz) {
	 this.columns = new ArrayList<ColumnMapping>();
	 this.clazz = clazz;
	 this.tableName = getCacheStr(TableUtil.clazzToTableName(clazz));
	 this.primaryKey = getCacheStr(TableUtil.clazzToTableKey(clazz));
	 initColumns(clazz);
	 }
	
	 private void initColumns(Class<? extends BaseEntity> clazz) {
	 List<Method> ms = TableUtil.listMethod(clazz, "^set.+");
	
	 ColumnMapping col;
	 for(Method m : ms) {
	 col = new ColumnMapping();
	 col.tableColumn = getCacheStr(TableUtil.methodToColumnName(m));
	 col.clazzColumn = getCacheStr(TableUtil.setOrGetmethodToHump(m));
	 col.getMethodName = getCacheStr(m.getName().replaceFirst("set", "get"));
	 col.setMethodName = getCacheStr(m.getName());
	 col.clazzType = m.getParameterTypes()[0];
	 columns.add(col);
	 }
	 }
	
	 public static List<ColumnMapping> getColumnMappings(Class<? extends BaseEntity> clazz) {
	 return getTableMapping(clazz).columns;
	 }
	}
试试其它关键字
　TableMapping　　实体类　　数据库表　
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.TableMapping数据库表实体类对应