"success":false,"code":500,"message":"nested exception is org.apache.ibatis.exceptions.PersistenceException: \n### Error querying database. Cause: o rg.springframework.jdbc.CannotGetJdbcConnectionException: Failed to obtain JDBC Connection; nested exception is dm.jdbc.driver.DMException: 网络通信...
In this case, ClickHouse proposes Nested data structures. For our case, these can be defined as: MySQL 1 2 3 4 5 6 7 8 9 10 11 CREATETABLEqueries ( PeriodDate, QueryIDUInt32, FingerprintString, ErrorsNested ( ErrorCodeString,
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A method and apparatus for providing access to object data stored in an object server in response to a database query. The method comprises the steps of receiving a database query comprising a relational operation with a data surrogate i... WP Jones,AF Kaufmann,C Luck,... - US 被引量:...
Query Parallel Distributed ProcessingNested QueryPerformance of OLAP queries becomes a critical issue as the amount of data in the data warehouses increases rapidly. To solve this performance issue, we proposed a high performance database cluster system called HyperDB in which many PCs can be ...
In Proc. Int. Conf. on Very Large Data Bases (VLDB), 1989. Google Scholar W. Kim. On optimizing an SQL-like nested query. ACM Trans. on Database Systems,7(3):443–469, Sep 82. Google Scholar M. Muralikrishna. Optimization and dataflow algorithms for nested tree queries. In Proc...
### Error querying database. Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Failed to obtain JDBC Connection; nested exception is java.sql.SQLException: oracle.jdbc.OracleDriver ### The error may exist in file [E:\xxx\xxx\xxx\xxMapper.xml] ...
innerGridData = x.C == true ? (from y in DatabaseContext.Set<YYY>() where y.A == x.A select new InnerGridData() { Q = y.A, W = y.B, E = y.C, R = y.D, T = y.E, Y = y.F }) : (from z in DatabaseContext.Set<ZZZ>() where z.A == x.A ...
This page provides examples of query operations on embedded/nested documents using thedb.collection.find()method inmongosh. The examples on this page use theinventorycollection. Connect to a test database in your MongoDB instance then create theinventorycollection: ...
Error querying database. Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Unknown column 'STATUS' in 'field list' The error may exist in URL jar:file:/F:/workForder/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/xinghe-web/WEB-INF/lib/xinghe-base-0.0.1-...