collectiontable

There have been a few previous problems with using JPA to map members in entity, and some annotations are easy to confuse, so keep this in mind. 1. Mapping of Map The key and value of this map are both string types, or other underlying types, and can be mapped using the following method: @ElementCollection @CollectionTable (name= "table_name") @MapKeyColumn (name= "Propkey") @Column (name= "PropValue") private map 2. Mapping of Map Key is the un

satisfy the paradigm "union": Join, based on index, algorithm "DataSet": a library, a schema, a collectionTable: Define column first, then rowThere can be no row, there must be columnStructure:SQL Engine: Perform [scan], analyze [parsing], solve [solution], optimize [Select Path | Modify path result unchanged] "transaction: Multiple operations are complete or not complete (atomicity atomicity, consistency consistency, isolating isolation Durability p

() not NULL,' skill_group_id ' int (one) not NULL) Engine=innodb DEFAULT Charset=utf8;Configured on the main table in model (Tskillgroup):Private map@ElementCollection (Fetch=fetchtype.eager)@MapKeyColumn (name = "Config_key")//The KEY value of the configuration property@Column (name = "Config_value", length = 290)//The value of the configuration property@CollectionTable (name = "Skill_configuration",//Configure table table nameJoincolumns = @JoinCol

that they are returned by the iterators that specify collectionTable. If the specified collection is modified while the operation is in progress, the behavior of the operation is indeterminate (note that if the specified collectionIs this list, and it is non-empty, this behavior can occur. ）E get (int index);returns the element at the specified position in the list. e Set (int index, e element);replaces the element in the specified position in the li

JS Object Table Table object (excerpt) Table Object CollectionTable object: Represents the tables in an HTML document, and the browser creates a Table object for each Collection Describe Cells[] Get an array that contains all the cells in a table JS fetch row in column Copy Code code as follows: var tbodyobj = document.getElementById (Tbodyid); Tbodyobj.rows[rowid].cells[colid].i