有什么方法可以得到 iBatis 的执行查询吗？我想将查询重用于 UNION 查询。
例如：
<sqlMap namespace="userSQLMap">
<select id="getUser" resultClass="UserPackage.User">
SELECT username,
password
FROM table
WHERE id=#value#
</select>
</sqlMap>
当我通过执行查询时
int id = 1
List<User> userList = queryDAO.executeForObjectList("userSQLMap.getUser",id)
我想得到SELECT username, password FROM table WHERE id=1
有什么办法可以得到查询吗？
谢谢。
将此添加到您的 log4j.xml 文件中，您可以在控制台上看到输出。
<logger name="java.sql" additivity="false">
<level value="debug" />
<appender-ref ref="console" />
</logger>
您将看到正在传递的参数、正在执行的查询以及查询的输出。
显示这些信息是可能的。iBatis 使用了一些 Logging 框架，包括Log4J.
要在类路径中使用Log4J创建文件log4j.properties。您必须将下一行放入文件中，例如：
log4j.logger.com.ibatis=DEBUG
log4j.logger.com.ibatis.common.jdbc.SimpleDataSource=DEBUG
log4j.logger.com.ibatis.common.jdbc.ScriptRunner=DEBUG
log4j.logger.com.ibatis.sqlmap.engine.impl.SqlMapClientDelegate=DEBUG
log4j.logger.com.ibatis=DEBUG
log4j.logger.java.sql.Connection=DEBUG
log4j.logger.java.sql.Statement=DEBUG
log4j.logger.java.sql.PreparedStatement=DEBUG
log4j.logger.java.sql.ResultSet=DEBUG
有关其他日志记录框架和详细信息，请参阅此链接
从您的 中获取Configuration对象SqlSessionFactory，然后：
MappedStatement ms = configuration.getMappedStatement("MyMappedStatementId");
BoundSql boundSql = ms.getBoundSql(parameters); // pass in parameters for the SQL statement
System.out.println("SQL" + boundSql.getSql());
import java.util.Properties;
import org.apache.ibatis.executor.Executor;
import org.apache.ibatis.mapping.BoundSql;
import org.apache.ibatis.mapping.MappedStatement;
import org.apache.ibatis.mapping.MappedStatement.Builder;
import org.apache.ibatis.mapping.SqlSource;
import org.apache.ibatis.plugin.Interceptor;
import org.apache.ibatis.plugin.Intercepts;
import org.apache.ibatis.plugin.Invocation;
import org.apache.ibatis.plugin.Plugin;
import org.apache.ibatis.plugin.Signature;
import org.apache.ibatis.session.ResultHandler;
import org.apache.ibatis.session.RowBounds;
import com.gm.common.orm.mybatis.dialect.Dialect;
import com.gm.common.utils.PropertiesHelper;
/**
* 为Mybatis提供基于方言(Dialect)的分页查询的插件
*
* 将拦截Executor.query()方法实现分页方言的插入.
*
* 配置文件内容:
*
* <pre>
* <plugins>
* <plugin interceptor="com.gm.common.orm.mybatis.plugin.OffsetLimitInterceptor">
* <property name="dialectClass" value="com.gm.common.orm.mybatis.dialect.MySQLDialect"/>
* </plugin>
* </plugins>
* </pre>
*/
@Intercepts({@Signature(type=Executor.class,method="query",args={MappedStatement.class,Object.class,RowBounds.class,ResultHandler.class})})
public class OffsetLimitInterceptor implements Interceptor {
static int MAPPED_STATEMENT_INDEX = 0;
static int PARAMETER_INDEX = 1;
static int ROWBOUNDS_INDEX = 2;
static int RESULT_HANDLER_INDEX = 3;
Dialect dialect;
public Object intercept(Invocation invocation) throws Throwable {
processIntercept(invocation.getArgs());
return invocation.proceed();
}
void processIntercept(final Object[] queryArgs) {
// queryArgs = query(MappedStatement ms, Object parameter, RowBounds
// rowBounds, ResultHandler resultHandler)
MappedStatement ms = (MappedStatement) queryArgs[MAPPED_STATEMENT_INDEX];
Object parameter = queryArgs[PARAMETER_INDEX];
final RowBounds rowBounds = (RowBounds) queryArgs[ROWBOUNDS_INDEX];
int offset = rowBounds.getOffset();
int limit = rowBounds.getLimit();
if (dialect.supportsLimit()
&& (offset != RowBounds.NO_ROW_OFFSET || limit != RowBounds.NO_ROW_LIMIT)) {
BoundSql boundSql = ms.getBoundSql(parameter);
String sql = boundSql.getSql().trim();
if (dialect.supportsLimitOffset()) {
sql = dialect.getLimitString(sql, offset, limit);
offset = RowBounds.NO_ROW_OFFSET;
} else {
sql = dialect.getLimitString(sql, 0, limit);
}
limit = RowBounds.NO_ROW_LIMIT;
queryArgs[ROWBOUNDS_INDEX] = new RowBounds(offset, limit);
BoundSql newBoundSql = new BoundSql(ms.getConfiguration(),
sql, boundSql.getParameterMappings(), boundSql
.getParameterObject());
MappedStatement newMs = copyFromMappedStatement(ms,
new BoundSqlSqlSource(newBoundSql));
queryArgs[MAPPED_STATEMENT_INDEX] = newMs;
}
}
// see: MapperBuilderAssistant
private MappedStatement copyFromMappedStatement(MappedStatement ms,
SqlSource newSqlSource) {
Builder builder = new MappedStatement.Builder(ms
.getConfiguration(), ms.getId(), newSqlSource, ms
.getSqlCommandType());
builder.resource(ms.getResource());
builder.fetchSize(ms.getFetchSize());
builder.statementType(ms.getStatementType());
builder.keyGenerator(ms.getKeyGenerator());
builder.keyProperty(ms.getKeyProperty());
// setStatementTimeout()
builder.timeout(ms.getTimeout());
// setStatementResultMap()
builder.parameterMap(ms.getParameterMap());
// setStatementResultMap()
builder.resultMaps(ms.getResultMaps());
builder.resultSetType(ms.getResultSetType());
// setStatementCache()
builder.cache(ms.getCache());
builder.flushCacheRequired(ms.isFlushCacheRequired());
builder.useCache(ms.isUseCache());
return builder.build();
}
public Object plugin(Object target) {
return Plugin.wrap(target, this );
}
public void setProperties(Properties properties) {
String dialectClass = new PropertiesHelper(properties)
.getRequiredString("dialectClass");
try {
dialect = (Dialect) Class.forName(dialectClass)
.newInstance();
} catch (Exception e) {
throw new RuntimeException(
"cannot create dialect instance by dialectClass:"
+ dialectClass, e);
}
System.out.println(OffsetLimitInterceptor.class.getSimpleName()
+ ".dialect=" + dialectClass);
}
public static class BoundSqlSqlSource implements SqlSource {
BoundSql boundSql;
public BoundSqlSqlSource(BoundSql boundSql) {
this .boundSql = boundSql;
}
public BoundSql getBoundSql(Object parameterObject) {
return boundSql;
}
}
}
大多数 SQL 引擎允许您“记录”所有执行的查询（通常连同有关查询所用时间、返回的结果数量等信息）。您是否有权访问引擎的日志，并且您可以对其进行配置，以便它记录您需要的所有内容吗？