@Override
public ArrayList<Relation> queryRelation(
Class class1, Class class2, List<String> key1List, List<String> key2List) {
acquireReference();
try {
SQLStatement stmt = SQLBuilder.buildQueryRelationSql(class1, class2, key1List, key2List);
final EntityTable table1 = TableManager.getTable(class1);
final EntityTable table2 = TableManager.getTable(class2);
final ArrayList<Relation> list = new ArrayList<Relation>();
Querier.doQuery(
mHelper.getReadableDatabase(),
stmt,
new Querier.CursorParser() {
@Override
public void parseEachCursor(SQLiteDatabase db, Cursor c) throws Exception {
Relation relation = new Relation();
relation.key1 = c.getString(c.getColumnIndex(table1.name));
relation.key2 = c.getString(c.getColumnIndex(table2.name));
list.add(relation);
}
});
return list;
} finally {
releaseReference();
}
}
/**
* 数据库分析 通过读数据库得到一张表的全部列名
*
* @param db
* @param tableName
* @return
*/
public ArrayList<String> getAllColumnsFromSQLite(SQLiteDatabase db, final String tableName) {
final EntityTable table = getTable(SQLiteColumn.class, false);
final ArrayList<String> list = new ArrayList<String>();
SQLStatement st = SQLBuilder.buildColumnsObtainAll(tableName);
Querier.doQuery(
db,
st,
new Querier.CursorParser() {
@Override
public void parseEachCursor(SQLiteDatabase db, Cursor c) throws Exception {
SQLiteColumn col = new SQLiteColumn();
DataUtil.injectDataToObject(c, col, table);
list.add(col.name);
}
});
return list;
}
/**
* 初始化全部表及其列名,初始化失败，则无法进行下去。
*
* @param db
*/
private void initAllTablesFromSQLite(SQLiteDatabase db) {
synchronized (mSqlTableMap) {
if (Checker.isEmpty(mSqlTableMap)) {
if (Log.isPrint) {
Log.i(TAG, "Initialize SQL table start--------------------->");
}
SQLStatement st = SQLBuilder.buildTableObtainAll();
final EntityTable table = getTable(SQLiteTable.class, false);
Querier.doQuery(
db,
st,
new Querier.CursorParser() {
@Override
public void parseEachCursor(SQLiteDatabase db, Cursor c) throws Exception {
SQLiteTable sqlTable = new SQLiteTable();
DataUtil.injectDataToObject(c, sqlTable, table);
ArrayList<String> colS = getAllColumnsFromSQLite(db, sqlTable.name);
if (Checker.isEmpty(colS)) {
// 如果读数据库失败了，那么解析建表语句
Log.e(TAG, "读数据库失败了，开始解析建表语句");
colS = transformSqlToColumns(sqlTable.sql);
}
sqlTable.columns = new HashMap<String, Integer>();
for (String col : colS) {
sqlTable.columns.put(col, 1);
}
if (Log.isPrint) {
Log.d(TAG, "Find One SQL Table: " + sqlTable);
}
mSqlTableMap.put(sqlTable.name, sqlTable);
}
});
if (Log.isPrint) {
Log.i(TAG, "Initialize SQL table end ---------------------> " + mSqlTableMap.size());
}
}
}
}