本次更新测试基于反射和注解：暂时不允许主键的更改
@Override
public void onUpgrade(sqliteDatabase db,int oldVersion,int newVersion) {
try {
List<Class<?>> list = new ArrayList<>();
TableScaner.scan(mContext,IConfig.tablePackageName,list);//扫描beans包下的类
for(Class clazz : list){
if(clazz.isAnnotationPresent(Table.class) && clazz.isAnnotationPresent(TabLeversion.class)){//是表才操作
TabLeversion tabLeversion = (TabLeversion) clazz.getAnnotation(TabLeversion.class);
boolean newTable = false;
if(tabLeversion.newTableCode() > oldVersion){//新增版本大于旧版本,保证先有表
db.execsql(DBTools.getCreatesql(clazz));
newTable = true;
}
if(tabLeversion.modifyTableCode() > tabLeversion.newTableCode()){//修改版本大于新增版本
Field[] fields = clazz.getDeclaredFields();
for(Field field : fields){
FieldVersion fieldVersion = field.getAnnotation(FieldVersion.class);
if(fieldVersion.newColumnCode() > tabLeversion.newTableCode()){//新增列
if(!newTable){//如果刚执行了新建表true,表明用户跨版本升级,则这里不再操作新增
try {
String sqlString = "ALTER TABLE " + DBTools.getTableName(clazz)+" ADD COLUMN "+ field.getName()+ getColumnType(field);
db.execsql(sqlString);
}catch (Exception e){//已经存在该列
Log.d("hjh",e.getMessage());
}
}
}
if(fieldVersion.deleteColumnCode() > fieldVersion.newColumnCode()){//删除版本必然大于新增版本
// db.execsql("insert into "+DBTools.getTableName(clazz)+" (test,userid) values("+System.currentTimeMillis()+",1)");
// db.execsql("insert into "+DBTools.getTableName(clazz)+" (test,2)");//测试
db.execsql("ALTER TABLE " + DBTools.getTableName(clazz)+" RENAME TO "+ "app_temp_table");//将原表重命名
db.execsql(createsqlExceptDelete(clazz));//重新创建
db.execsql("INSERT INTO " + DBTools.getTableName(clazz) + " SELECT "+getAllColumnsExceptDelete(clazz.getDeclaredFields())+" FROM app_temp_table");//插入数据
db.execsql("DROP TABLE app_temp_table");//删除临时表
}
}
}
}
}
} catch (Exception e) {
e.printstacktrace();
Log.d("hjh",e.getMessage());
}
}
//减少字段查找时使用
private String getAllColumnsExceptDelete(Field[] fields){
String content = "";
List<Field> list = new ArrayList<>();
for(Field field : fields){
field.setAccessible(true);
if(field.isAnnotationPresent(ColumnInt.class) || field.isAnnotationPresent(ColumnText.class) ||
field.isAnnotationPresent(ColumnFloat.class) || field.isAnnotationPresent(ColumnDouble.class)||
field.isAnnotationPresent(ColumnString.class)|| field.isAnnotationPresent(ColumnDate.class) ||
field.isAnnotationPresent(ColumnBinary.class) || field.isAnnotationPresent(ColumnLong.class)||
field.isAnnotationPresent(ColumnBoolean.class)){
if(field.isAnnotationPresent(FieldVersion.class)){
FieldVersion fieldVersion = field.getAnnotation(FieldVersion.class);
if(fieldVersion.deleteColumnCode() > fieldVersion.newColumnCode()) {
continue;//排除删除字段
}else {
list.add(field);
}
}
}
}
for(int index = 0; index < list.size();index ++){
if(index != list.size() -1){//非最后一个
content += list.get(index).getName()+",";
}else {
content += list.get(index).getName();
}
}
return content;
}
//增加字段时使用
private String getColumnType(Field field){
field.setAccessible(true);
String content = "";
if(field.isAnnotationPresent(ColumnInt.class) && !field.isAnnotationPresent(ColumnPrimaryKey.class)) {
content = " integer";
} else if(field.isAnnotationPresent(ColumnText.class)) {
content = " text";
} else if(field.isAnnotationPresent(ColumnFloat.class)) {
content = " float";
} else if(field.isAnnotationPresent(ColumnDouble.class)) {
content = " double";
} else if(field.isAnnotationPresent(ColumnString.class)) {
content = " varchar(" + ((ColumnString)ColumnString.class.cast(field.getAnnotation(ColumnString.class))).length() + ")";
} else if(field.isAnnotationPresent(ColumnDate.class)) {
content = " date";
} else if(field.isAnnotationPresent(ColumnBinary.class)) {
content = " blob";
} else if(field.isAnnotationPresent(ColumnBoolean.class)) {
content = " boolean";
} else if(field.isAnnotationPresent(ColumnLong.class)) {
content = " NUMBER";
}
return content;
}
private String createsqlExceptDelete(Class clazz){
String sql = "";
if(clazz.isAnnotationPresent(Table.class)){
Table annotationType = (Table) clazz.getAnnotation(Table.class);
String tableName = annotationType.TableName();
Field[] fields = clazz.getDeclaredFields();
String content =getContentExceptDelete(fields);
content = content.substring(0,content.lastIndexOf(","));
sql = "create table "+tableName+" ("+content+" )";
}
return sql;
}
private String getContentExceptDelete(Field[] fields){
String content="";
//先设置主键
for(Field field : fields){
field.setAccessible(true);
if(field.isAnnotationPresent(FieldVersion.class)){
FieldVersion fieldVersion = field.getAnnotation(FieldVersion.class);
if(fieldVersion.deleteColumnCode() > fieldVersion.newColumnCode())continue;
}
if(field.isAnnotationPresent(ColumnPrimaryKey.class) && field.isAnnotationPresent(ColumnInt.class)){
ColumnPrimaryKey primaryKey = field.getAnnotation(ColumnPrimaryKey.class);
content += field.getName()+primaryKey.TYPE().getContent()+",";
break;
}
}
for(Field field : fields){
field.setAccessible(true);
if(field.isAnnotationPresent(FieldVersion.class)){
FieldVersion fieldVersion = field.getAnnotation(FieldVersion.class);
if(fieldVersion.deleteColumnCode() > fieldVersion.newColumnCode())continue;
}
if(field.isAnnotationPresent(ColumnInt.class) && !field.isAnnotationPresent(ColumnPrimaryKey.class)){
content += field.getName()+" integer,";
continue;
}
if(field.isAnnotationPresent(ColumnText.class)){
content += field.getName()+" text,";
continue;
}
if(field.isAnnotationPresent(ColumnFloat.class)){
content += field.getName()+" float,";
continue;
}
if(field.isAnnotationPresent(ColumnDouble.class)){
content += field.getName()+" double,";
continue;
}
if(field.isAnnotationPresent(ColumnString.class)){
content += field.getName()+" varchar("+ColumnString.class.cast( field.getAnnotation(ColumnString.class)).length()+"),";
continue;
}
if(field.isAnnotationPresent(ColumnDate.class)){
content += field.getName()+" date,";
continue;
}
if(field.isAnnotationPresent(ColumnBinary.class)){
content += field.getName()+" blob,";
continue;
}
if(field.isAnnotationPresent(ColumnBoolean.class)){
content += field.getName()+" boolean,";
continue;
}
if(field.isAnnotationPresent(ColumnLong.class)){
content += field.getName()+" NUMBER,";
}
}
return content;
}
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