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Listing 4.2 Dynamic result mapping example
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<select id="getAccountRemapExample" remapResults="true" resultClass="java.util.HashMap" > select accountId, username, <dynamic> <isEqual property="includePassword" compareValue="true" > password, </isEqual> </dynamic> firstName, lastName from Account <dynamic prepend=" where "> <isNotEmpty property="city"> city like #city# </isNotEmpty> <isNotNull property="accountId" prepend=" and "> accountId = #accountId# </isNotNull> </dynamic> </select>
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Remaps results when mapped statement executes
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Contains simple Dynamic SQL to demonstrate technique
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Mapping parameters
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The example in listing 4.2 uses the remapResults attribute b combined with Dynamic SQL C to demonstrate how to change the data returned from a mapped statement on the fly. While Dynamic SQL is not covered until chapter 8, this example uses it to create a mapped statement where the value of the includePassword property determines the fields that are in the results. Depending on its value, you may or may not get the password field back in your results. One thing to be aware of is that the performance hit for determining a result map each and every time a statement is run may be prohibitive, so use this feature only when it is an absolute requirement.
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4.2.5 Joining related data
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There are times when you want to join multiple data tables into a single flattened-out structure for reporting or other purposes. The iBATIS framework makes this completely effortless, because it maps SQL statements to objects, not tables to objects. There is literally no difference between mapping a single-table select and a multitable select. In chapter 7, we will look at how to perform more advanced multitable operations for the purpose of providing lists of child objects that are related to their containing objects such as a list of orders details for an order. For now, we will simply restate that there is literally no difference between mapping a single-table select and a multitable select. We have talked about how SQL is similar to a function in that it has input values and, based on those input values, it produces output values. In the next section, let s see how you provide those input values.
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4.3 Mapping parameters
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There are two ways to map parameters into your mapped statements: inline mapping and external mapping. Using inline parameter mapping means that you give iBATIS some hints as to what you want, and let it figure out the details. External parameter mapping, on the other hand, is more explicit you tell iBATIS exactly what you want it to do.
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4.3.1 External parameter maps
You can specify up to six attributes when using an external parameter map. If you do not specify them, iBATIS will try to decide on reasonable values using reflection, but this takes time and may not be as accurate. Table 4.4 lists the attributes that are available for mapping parameters, and briefly describes how each is used.
Working with mapped statements
Table 4.4 Parameter mapping attributes Description The property attribute of the parameter map is the name of a JavaBean property or Map entry of the parameter object passed to a mapped statement. The name can be used more than once, depending on the number of times it is needed in the statement. For example, if the same property is being updated in the set clause of a SQL UPDATE statement, and is also used as part of the key in the WHERE clause, the name can be referenced twice in the mapped statement.
Attribute
property
javaType
The javaType attribute is used to explicitly specify the Java property type of the parameter to be set. Normally this can be derived from a JavaBean property through reflection, but certain mappings such as Map and XML mappings cannot provide the type to the framework. In those cases, if the javaType is not set and the framework cannot otherwise determine the type, the type is assumed to be Object.
jdbcType
The jdbcType attribute is used to explicitly specify the database type of the parameter. Some JDBC drivers are not able to identify the type of a column for certain operations without explicitly telling the driver the column type. A perfect example of this is the PreparedStatement.setNull(int parameterIndex, int sqlType) method. This method requires the type to be specified. Some drivers will allow the type to be implicit by simply sending Types.OTHER or Types.NULL. However, the behavior is inconsistent and some drivers need the exact type to be specified. For such situations, iBATIS allows the type to be specified using the jdbcType attribute of the parameterMap property element. This attribute is normally only required if the column can be set to null. Another reason to use the type attribute is to explicitly specify date types when the Java type may be ambiguous. For example, Java only has one Date value type (java.util.Date), but most SQL databases usually have at least three different types. Because of this you might want to specify explicitly that your column type is DATE versus DATETIME. The jdbcType attribute can be set to any string value that matches a constant in the JDBC Types class.
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