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190 lines (169 loc) · 5.73 KB
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package org.ithang.tools;
import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;
import org.apache.log4j.Logger;
import org.ithang.Model;
import org.ithang.tools.lang.StrUtils;
import org.ithang.tools.mate.Column;
import org.ithang.tools.mate.Ignore;
import org.ithang.tools.mate.Primary;
import org.ithang.tools.mate.Table;
public final class ModelTools {
private final static Random r=new Random(System.currentTimeMillis());
private final static String[] tableLabels=new String[]{"a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","x","y","z","A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","X","Y","Z"};
private final static Logger logger=Logger.getLogger(ModelTools.class);
/**
* 解析class对象，获得所有字段属性的相关信息
* @param cls
* @return List<Model> 每个字段对应一个Model对象
*/
public static List<Model> parseCls(Class<?> cls){
String tableName=null;
String tableLabel=null;
Model m=null;
Field[] fields=null;
List<Model> mds=null;
try{
tableName=getTableName(cls);
//为表创建一个别名,用于字段前缀
tableLabel=tableLabels[r.nextInt(tableLabels.length)]+String.valueOf(r.nextInt(36));
fields=cls.getDeclaredFields();
if(null==fields||0==fields.length){
logger.error("无效Class对象,得不到任何字段信息!");
return null;
}
mds=new ArrayList<Model>(fields.length);
for(Field field:fields){
//不处理序列化字段
if("serialVersionUID".equals(field.getName())){
continue;
}
//如果存在ignore注解，则表示不处理该字段，该字段不对应表中任何列
if(field.isAnnotationPresent(Ignore.class)){
continue;
}
m=new Model();
m.setTableName(tableName);
m.setFieldName(field.getName());
m.setFieldType(field.getType().getSimpleName());
m.setTableLabel(tableLabel);
//判断是否存在column注解，如果存在则用注解值作为列名
if(field.isAnnotationPresent(Column.class)){
Column column=field.getAnnotation(Column.class);
m.setColumnName(column.value());
if(StrUtils.isNotBlank(column.defaultValue())){
m.setValue(column.defaultValue());
}else{
m.setValue("NULL");
}
}else{
m.setColumnName(StrUtils.addUnderline(field.getName()));
m.setValue("NULL");
}
//判断是不是主键
if(field.isAnnotationPresent(Primary.class)){
Primary pri=field.getAnnotation(Primary.class);
if(null!=pri&&null!=pri.Seq()&&pri.Seq().trim().length()>0){//设置主键sequence
m.setSequence(pri.Seq());
}
m.setPrimary(true);
}else{
m.setPrimary(false);
}
mds.add(m);
}
}catch(Exception e){
e.printStackTrace();
}
return mds;
}
/**
* 得到表名
* @param cls
* @return
*/
public static String getTableName(Class<?> cls){
if(cls.isAnnotationPresent(Table.class)){
Table table=cls.getAnnotation(Table.class);
if(null!=table&&StrUtils.isNotBlank(table.value())){
return table.value();
}
}
return StrUtils.addUnderline(cls.getSimpleName());
}
public static Field getField(Class<?> cls,String fieldName){
Field field=null;
try{
field=cls.getDeclaredField(fieldName);
}catch(Exception e){
e.printStackTrace();
}
return field;
}
public static String getFieldValue(Object bean,String fieldName){
Field field=null;
try{
field=getField(bean.getClass(),fieldName);
Class<?> fieldType=field.getType();
Object v=bean.getClass().getMethod("get"+StrUtils.headUpper(fieldName)).invoke(bean);
if(fieldType==String.class){
return "'"+(v==null?"":v)+"'";
}else{
return v==null?"0":String.valueOf(v);
}
}catch(Exception e){
e.printStackTrace();
}
return null;
}
public static String[] getFieldNames(Class<?> cls){
String[] fieldNames=null;
try{
Field[] fields=cls.getDeclaredFields();
if(null!=fields&&fields.length>0){
fieldNames=new String[fields.length];
int i=0;
for(Field field:fields){
fieldNames[i++]=field.getName();
}
}
}catch(Exception e){
e.printStackTrace();
}
return fieldNames;
}
public static String[] getColumnNames(Class<?> cls){
String[] columnNames=null;
try{
Field[] fields=cls.getDeclaredFields();
if(null!=fields&&fields.length>0){
columnNames=new String[fields.length];
int i=0;
for(Field field:fields){
if(field.isAnnotationPresent(Column.class)){
columnNames[i++]=field.getAnnotation(Column.class).value();
}else{
columnNames[i++]=StrUtils.addUnderline(field.getName());
}
}
}
}catch(Exception e){
e.printStackTrace();
}
return columnNames;
}
/*public static void generBeanFromMySQL(Connection conn,String schema) throws SQLException{
QueryRunner qr=new QueryRunner();
List<String> tables=qr.query(conn,"select table_name from information_schema.columns where table_schema='"+schema+"'", new ColumnListHandler<String>());
if(null!=tables&&tables.size()>0){
for(String table:tables){
List<Column> columns=qr.query(conn, "select table_name,column_name,is_nullable,data_type,column_key,character_maximum_length len from information_schema.columns where table_schema='"+schema+"'", new BeanListHandler<Column>(Column.class));
}
}
}
private static List<Model> parseModelFromTable(List<Column> columns){
return null;
}*/
}