package org.apache.ibatis.session.defaults;
import org.apache.ibatis.exceptions.ExceptionFactory;
import org.apache.ibatis.exceptions.TooManyResultsException;
import org.apache.ibatis.executor.Executor;
import org.apache.ibatis.executor.ErrorContext;
import org.apache.ibatis.mapping.MappedStatement;
import org.apache.ibatis.session.Configuration;
import org.apache.ibatis.session.ResultHandler;
import org.apache.ibatis.session.RowBounds;
import org.apache.ibatis.session.SqlSession;
import java.sql.Connection;
import java.util.HashMap;
import java.util.List;
public class DefaultSqlSession implements SqlSession {
private Configuration configuration;
private Executor executor;
private boolean autoCommit;
private boolean dirty;
public DefaultSqlSession(Configuration configuration, Executor executor, boolean autoCommit) {
this.configuration = configuration;
this.executor = executor;
this.autoCommit = autoCommit;
this.dirty = false;
}
public Object selectOne(String statement) {
return selectOne(statement, null);
}
public Object selectOne(String statement, Object parameter) {
// Popular vote was to return null on 0 results and throw exception on too many.
List list = selectList(statement, parameter);
if (list.size() == 1) {
return list.get(0);
} else if (list.size() > 1) {
throw new TooManyResultsException("Expected one result (or null) to be returned by selectOne(), but found: " + list.size());
} else {
return null;
}
}
public List selectList(String statement) {
return selectList(statement, null);
}
public List selectList(String statement, Object parameter) {
return selectList(statement, parameter, RowBounds.DEFAULT);
}
public List selectList(String statement, Object parameter, RowBounds rowBounds) {
try {
MappedStatement ms = configuration.getMappedStatement(statement);
return executor.query(ms, wrapCollection(parameter), rowBounds, Executor.NO_RESULT_HANDLER);
} catch (Exception e) {
throw ExceptionFactory.wrapException("Error querying database. Cause: " + e, e);
} finally {
ErrorContext.instance().reset();
}
}
public void select(String statement, Object parameter, ResultHandler handler) {
select(statement, parameter, RowBounds.DEFAULT, handler);
}
public void select(String statement, Object parameter, RowBounds rowBounds, ResultHandler handler) {
try {
MappedStatement ms = configuration.getMappedStatement(statement);
executor.query(ms, wrapCollection(parameter), rowBounds, handler);
} catch (Exception e) {
throw ExceptionFactory.wrapException("Error querying database. Cause: " + e, e);
} finally {
ErrorContext.instance().reset();
}
}
public int insert(String statement) {
return insert(statement, null);
}
public int insert(String statement, Object parameter) {
return update(statement, parameter);
}
public int update(String statement) {
return update(statement, null);
}
public int update(String statement, Object parameter) {
try {
dirty = true;
MappedStatement ms = configuration.getMappedStatement(statement);
return executor.update(ms, wrapCollection(parameter));
} catch (Exception e) {
throw ExceptionFactory.wrapException("Error updating database. Cause: " + e, e);
} finally {
ErrorContext.instance().reset();
}
}
public int delete(String statement) {
return update(statement, null);
}
public int delete(String statement, Object parameter) {
return update(statement, wrapCollection(parameter));
}
public void commit() {
commit(false);
}
public void commit(boolean force) {
try {
executor.commit(isCommitOrRollbackRequired(force));
dirty = false;
} catch (Exception e) {
throw ExceptionFactory.wrapException("Error committing transaction. Cause: " + e, e);
} finally {
ErrorContext.instance().reset();
}
}
public void rollback() {
rollback(false);
}
public void rollback(boolean force) {
try {
executor.rollback(isCommitOrRollbackRequired(force));
dirty = false;
} catch (Exception e) {
throw ExceptionFactory.wrapException("Error rolling back transaction. Cause: " + e, e);
} finally {
ErrorContext.instance().reset();
}
}
public void close() {
try {
try {
rollback(false);
} finally {
executor.close();
}
} catch (Exception e) {
throw ExceptionFactory.wrapException("Error closing transaction. Cause: " + e, e);
} finally {
ErrorContext.instance().reset();
}
}
public Configuration getConfiguration() {
return configuration;
}
public <T> T getMapper(Class<T> type) {
return configuration.getMapper(type, this);
}
public Connection getConnection() {
return executor.getTransaction().getConnection();
}
private boolean isCommitOrRollbackRequired(boolean force) {
return (!autoCommit && dirty) || force;
}
private Object wrapCollection(final Object object) {
if (object instanceof List) {
return new HashMap() {{
put("list", object);
}};
} else if (object != null && object.getClass().isArray()) {
return new HashMap() {{
put("array", object);
}};
}
return object;
}
}
|