sqlite数据处理工具
1，在定义变量名称时，使用实体属性和数据库列名一致，方便后续处理2，工具类通过java反射技术编写
3，在使用数据库操作，查询时Cursor封装实体属性值，修改时实体对象转换为ContentValues
4，方法中提供两种方式转换，使用public 属性，private 属性 通过getset方法使值对象话
import java.io.Serializable;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.lang.reflect.Type;
import android.content.ContentValues;
import android.database.Cursor;
/**
*
*@date 2015-7-8
*@author zhengshijun
*
*/
public class SqliteUtils
{
public static <T> T cursorToEntity(Cursor cursor,Class<T> classEntity) throws InstantiationException, IllegalAccessException{
T o = null;
o = classEntity.newInstance();
Class<?> entity = o.getClass();
Field[] fields = entity.getFields();
for(Field field:fields){
if(Modifier.isStatic(field.getModifiers()))continue;
String name = field.getName();
int index = cursor.getColumnIndex(name);
if(index==-1)continue;
Class<?> type = field.getType();
if(type == String.class){
field.set(o, cursor.getString(index));
}else if(type == Integer.class||type==int.class){
field.setInt(o, cursor.getInt(index));
}else if(type == Double.class||type == double.class ){
field.setDouble(o, cursor.getDouble(index));
}else if(type == Float.class|| type==float.class){
field.setFloat(o, cursor.getFloat(index));
}else if(type == Long.class||type == long.class){
field.setLong(o, cursor.getLong(index));
}
}
return o;
}
public static ContentValues entityToValues(Serializable entity) throws IllegalArgumentException, IllegalAccessException{
ContentValues values =null;
if(entity!=null){
values = new ContentValues();
Class<?> classEntity = entity.getClass();
Field[] fields =classEntity.getFields();
for(Field field:fields){
if(Modifier.isStatic(field.getModifiers()))continue;
String name = field.getName();
Class<?> type = field.getType();
if(type == String.class){
Object value = field.get(entity);
if(value==null)continue;
values.put(name, value.toString());
}else if(type == Integer.class||type==int.class){
Integer value = field.getInt(entity);
if(value==null)continue;
values.put(name, value);
}else if(type == Double.class||type == double.class ){
Double value = field.getDouble(entity);
if(value==null)continue;
values.put(name, value);
}else if(type == Float.class|| type==float.class){
Float value = field.getFloat(entity);
if(value==null)continue;
values.put(name, value);
}else if(type == Long.class||type == long.class){
Long value = field.getLong(entity);
if(value==null)continue;
values.put(name, value);
}
}
}
return values;
}
public static <T> T cursorToEntity2(Cursor cursor,Class<T> classEntity) throws InstantiationException, IllegalAccessException, IllegalArgumentException, InvocationTargetException{
T o = null;
o = classEntity.newInstance();
Class<?> entity = o.getClass();
Method methods[] = entity.getMethods();
for(Method method:methods){
if(Modifier.isStatic(method.getModifiers()))continue;
String methodName = method.getName();
if(methodName.startsWith("set")){
Type types[] = method.getGenericParameterTypes();
if(method.getGenericReturnType().equals(void.class)&&types.length==1){
String name = Character.toLowerCase(methodName.charAt(3))+methodName.substring(4);
int index = cursor.getColumnIndex(name);
if(index==-1)continue;
Type type = types;
if(type == String.class){
method.invoke(o, cursor.getString(index));
}else if(type == Integer.class||type==int.class){
method.invoke(o, cursor.getInt(index));
}else if(type == Double.class||type == double.class ){
method.invoke(o, cursor.getDouble(index));
}else if(type == Float.class|| type==float.class){
method.invoke(o, cursor.getFloat(index));
}else if(type == Long.class||type == long.class){
method.invoke(o, cursor.getLong(index));
}else if(type==java.util.Date.class){
}else if(type ==java.sql.Date.class){
}
}
}
}
return o;
}
public static ContentValues entityToValues2(Serializable entity) throws IllegalArgumentException, IllegalAccessException, InvocationTargetException{
ContentValues values =null;
if(entity!=null){
values = new ContentValues();
Class<?> classEntity = entity.getClass();
Method methods[] = classEntity.getMethods();
for(Method method:methods){
if(Modifier.isStatic(method.getModifiers()))continue;
String methodName = method.getName();
if(methodName.startsWith("get")){
Type types[] = method.getGenericParameterTypes();
Type type = method.getReturnType();
if(types.length==0&&!type.equals(void.class)){
String name = Character.toLowerCase(methodName.charAt(3))+methodName.substring(4);
if(type == String.class){
Object value =method.invoke(entity);
if(value==null)continue;
values.put(name, value.toString());
}else if(type == Integer.class||type==int.class){
Integer value = (Integer) method.invoke(entity);
if(value==null)continue;
values.put(name, value);
}else if(type == Double.class||type == double.class ){
Double value = (Double) method.invoke(entity);
if(value==null)continue;
values.put(name, value);
}else if(type == Float.class|| type==float.class){
Float value = (Float) method.invoke(entity);
if(value==null)continue;
values.put(name, value);
}else if(type == Long.class||type == long.class){
Long value = (Long) method.invoke(entity);
if(value==null)continue;
values.put(name, value);
}
}
}
}
}
return values;
}
}
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