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166 lines (149 loc) · 3.86 KB
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package org.ithang;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
/**
* 主要工具类,功能:根据实体类生成SQL
* @author ithang
*
*/
public class MSQL {
//private static boolean cache=false;//是否缓存解析实体类信息 (该功能要主用于生产环境,业务实体类不变的情况下,用于提高解析效率)
private static Map<String,Mod> modelFields=new ConcurrentHashMap<>(50);
public static String select(Class<?> cls,String ...fieldNames){
StringBuilder sb=new StringBuilder();
Mod md=getMod(cls);
sb.append("select ");
if(null!=fieldNames&&fieldNames.length>0){
int i=0;
for(String fieldName:fieldNames){
if(i>0){
sb.append(" , ");
}
sb.append(md.getColumnName(fieldName));
i++;
}
}else{
String[] columnNames=md.getColumnNames();
if(null!=columnNames){
int i=0;
for(String cm:columnNames){
if(i>0){
sb.append(",");
}
sb.append(cm);
i++;
}
}
}
sb.append(" from ").append(md.getTableName());
return sb.toString();
}
public static String insert(Class<?> cls){
StringBuilder sb=new StringBuilder();
Mod md=getMod(cls);
sb.append("insert into ").append(md.getTableName());
String[] columnNames=md.getColumnNames();
String[] fieldNames=md.getFieldNames();
if(null!=columnNames){
int i=0;
sb.append("(");
for(String cm:columnNames){
if(i>0){
sb.append(",");
}
sb.append(cm);
i++;
}
sb.append(")");
}
sb.append("values");
if(null!=fieldNames){
int i=0;
sb.append("(");
for(String cm:fieldNames){
if(i>0){
sb.append(",");
}
sb.append(":").append(cm);
i++;
}
sb.append(")");
}
return sb.toString();
}
public static String update(Class<?> cls,String ...fieldNames){
StringBuilder sb=new StringBuilder();
Mod md=getMod(cls);
String[] primaryFieldNames=md.getPrimaryFieldNames();
sb.append("update ").append(md.getTableName());
if(null==fieldNames){
fieldNames=md.getFieldNames();
}
int i=0;
sb.append(" set ");
for(String fieldName:fieldNames){
for(String pfn:primaryFieldNames){
if(fieldName==pfn){
continue;
}
}
if(i>0){
sb.append(" , ");
}
sb.append(md.getColumnName(fieldName)).append("=:").append(fieldName);
i++;
}
sb.append(" where ");
i=0;
boolean named=primaryFieldNames.length>2?true:false;
for(String fieldName:primaryFieldNames){
if(i>0){
sb.append(" and ");
}
sb.append(fieldName);
if(named){
sb.append("=:").append(md.getColumnName(fieldName));
}else{
sb.append("=?");
}
i++;
}
return sb.toString();
}
public static String delete(Class<?> cls){
StringBuilder sb=new StringBuilder();
Mod md=getMod(cls);
String[] primaryFieldNames=md.getPrimaryFieldNames();
sb.append("delete from ").append(md.getTableName());
if(null!=primaryFieldNames&&primaryFieldNames.length>0){
sb.append(" where ");
boolean named=primaryFieldNames.length>1?true:false;
int i=0;
for(String fieldName:primaryFieldNames){
if(i>0){
sb.append(" and ");
}
sb.append(md.getColumnName(fieldName));
if(named){
sb.append("=:").append(md.getColumnName(fieldName));
}else{
sb.append("=?");
}
i++;
}
}
return sb.toString();
}
private static Mod getMod(Class<?> cls){
if(null!=modelFields){
if(modelFields.containsKey(cls.getName())){
return modelFields.get(cls.getName());
}else{
Mod mod=new Mod(cls);
modelFields.put(cls.getName(), mod);
return mod;
}
}
return new Mod(cls);
}
}