- <hibernate-mapping>
- <class name="com.hhkj.workflow.bean.AllTablePb" table="V_ALLTAB_PB" schema="CANP">
- <composite-id name="id" class="com.hhkj.workflow.bean.AllTablePbId">
- <key-property name="owner" type="string">
- <column name="OWNER" length="30" />
- </key-property>
- <key-property name="tableName" type="string">
- <column name="TABLE_NAME" length="30" />
- </key-property>
- <key-property name="columnName" type="string">
- <column name="COLUMN_NAME" length="30" />
- </key-property>
- </composite-id>
- </class>
- </hibernate-mapping>
既然 視圖就是表,那麼在寫類和映射文件的時候,無需有什麼特別的地方,按照正常寫就可以了,
只是主鍵需要處理一下,如上如果複合主鍵中有一個值爲NULL,則 from view查詢出來的集合中都是
NULL值.此時可以採用如下配置文件方式:
- <hibernate-mapping>
- <class name="com.hhkj.workflow.bean.AllTablePbId" table="V_ALLTAB_PB">
- <id name="id" type="java.lang.String" column="ID" length="50" >
- <generator class="assigned"></generator>
- </id>
- <property name="OWNER" type="java.util.Date">
- <column name="OWNER" length="30" />
- </property>
- <property name="TABLE_NAME" type="java.lang.String">
- <column name="TABLE_NAME" length="30" />
- </property>
- <property name="COLUMN_NAME" type="java.lang.String">
- <column name="COLUMN_NAME" length="30" />
- </property>
- </class>
- </hibernate-mapping>
此處保證id爲表中唯一字段,並且不爲null。
所以在用Hibernate對視圖進行操作的時候應該注意:要確定好複合主鍵的個數,如果將所有字段
都作爲複合主鍵.當一個爲NULL時候,from view查詢出來的集合中都是NULL值.其他操作類似Hibernate
對錶的操作。
聯合主鍵不爲NULL時,可以這樣做:
public class AllTablePb implements Serializable {
// Fields
private AllTablePbId id; //**********生成id的getter,setter方法
// Property accessors
public AllTablePbId getId() {
return this.id;
}
public void setId(AllTablePbId id) {
this.id = id;
}
}
public class AllTablePbId implements java.io.Serializable {
// Fields
private String owner;
private String tableName;
private String columnName;
private String dataType;
private String pbcCnam;
private String pbcCmnt;
// Property accessors
public String getOwner() {
return this.owner;
}
public void setOwner(String owner) {
this.owner = owner;
}
public String getTableName() {
return this.tableName;
}
public void setTableName(String tableName) {
this.tableName = tableName;
}
public String getColumnName() {
return this.columnName;
}
public void setColumnName(String columnName) {
this.columnName = columnName;
}
public String getDataType() {
return this.dataType;
}
public void setDataType(String dataType) {
this.dataType = dataType;
}
public String getPbcCnam() {
return this.pbcCnam;
}
public void setPbcCnam(String pbcCnam) {
this.pbcCnam = pbcCnam;
}
public String getPbcCmnt() {
return this.pbcCmnt;
}
public void setPbcCmnt(String pbcCmnt) {
this.pbcCmnt = pbcCmnt;
}
}
配置文件:
<hibernate-mapping>
<class name="com.hhkj.workflow.bean.AllTablePb" table="V_ALLTAB_PB" schema="CANP">
<composite-id name="id" class="com.hhkj.workflow.bean.AllTablePbId">
<key-property name="owner" type="string">
<column name="OWNER" length="30" />
</key-property>
<key-property name="tableName" type="string">
<column name="TABLE_NAME" length="30" />
</key-property>
<key-property name="columnName" type="string">
<column name="COLUMN_NAME" length="30" />
</key-property>
<key-property name="dataType" type="string">
<column name="DATA_TYPE" length="106" />
</key-property>
<key-property name="pbcCnam" type="string">
<column name="PBC_CNAM" length="30" />
</key-property>
<key-property name="pbcCmnt" type="string">
<column name="PBC_CMNT" length="254" />
</key-property>
</composite-id>
</class>
</hibernate-mapping>
這樣就可以通過AllTablePb.getId()取得相關的信息。