com.mysql.jdbc.MysqlParameterMetadata Maven / Gradle / Ivy
/*
Copyright (c) 2005, 2014, Oracle and/or its affiliates. All rights reserved.
The MySQL Connector/J is licensed under the terms of the GPLv2
, like most MySQL Connectors.
There are special exceptions to the terms and conditions of the GPLv2 as it is applied to
this software, see the FLOSS License Exception
.
This program is free software; you can redistribute it and/or modify it under the terms
of the GNU General Public License as published by the Free Software Foundation; version 2
of the License.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with this
program; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth
Floor, Boston, MA 02110-1301 USA
*/
package com.mysql.jdbc;
import java.sql.ParameterMetaData;
import java.sql.SQLException;
import java.sql.Types;
public class MysqlParameterMetadata implements ParameterMetaData {
boolean returnSimpleMetadata = false;
ResultSetMetaData metadata = null;
int parameterCount = 0;
private ExceptionInterceptor exceptionInterceptor;
MysqlParameterMetadata(Field[] fieldInfo, int parameterCount, ExceptionInterceptor exceptionInterceptor) {
this.metadata = new ResultSetMetaData(fieldInfo, false, true, exceptionInterceptor);
this.parameterCount = parameterCount;
this.exceptionInterceptor = exceptionInterceptor;
}
/**
* Used for "fake" basic metadata for client-side prepared statements when
* we don't know the parameter types.
*
* @param parameterCount
*/
MysqlParameterMetadata(int count) {
this.parameterCount = count;
this.returnSimpleMetadata = true;
}
public int getParameterCount() throws SQLException {
return this.parameterCount;
}
public int isNullable(int arg0) throws SQLException {
checkAvailable();
return this.metadata.isNullable(arg0);
}
private void checkAvailable() throws SQLException {
if (this.metadata == null || this.metadata.fields == null) {
throw SQLError.createSQLException("Parameter metadata not available for the given statement", SQLError.SQL_STATE_DRIVER_NOT_CAPABLE,
this.exceptionInterceptor);
}
}
public boolean isSigned(int arg0) throws SQLException {
if (this.returnSimpleMetadata) {
checkBounds(arg0);
return false;
}
checkAvailable();
return (this.metadata.isSigned(arg0));
}
public int getPrecision(int arg0) throws SQLException {
if (this.returnSimpleMetadata) {
checkBounds(arg0);
return 0;
}
checkAvailable();
return (this.metadata.getPrecision(arg0));
}
public int getScale(int arg0) throws SQLException {
if (this.returnSimpleMetadata) {
checkBounds(arg0);
return 0;
}
checkAvailable();
return (this.metadata.getScale(arg0));
}
public int getParameterType(int arg0) throws SQLException {
if (this.returnSimpleMetadata) {
checkBounds(arg0);
return Types.VARCHAR;
}
checkAvailable();
return (this.metadata.getColumnType(arg0));
}
public String getParameterTypeName(int arg0) throws SQLException {
if (this.returnSimpleMetadata) {
checkBounds(arg0);
return "VARCHAR";
}
checkAvailable();
return (this.metadata.getColumnTypeName(arg0));
}
public String getParameterClassName(int arg0) throws SQLException {
if (this.returnSimpleMetadata) {
checkBounds(arg0);
return "java.lang.String";
}
checkAvailable();
return (this.metadata.getColumnClassName(arg0));
}
public int getParameterMode(int arg0) throws SQLException {
return parameterModeIn;
}
private void checkBounds(int paramNumber) throws SQLException {
if (paramNumber < 1) {
throw SQLError.createSQLException("Parameter index of '" + paramNumber + "' is invalid.", SQLError.SQL_STATE_ILLEGAL_ARGUMENT,
this.exceptionInterceptor);
}
if (paramNumber > this.parameterCount) {
throw SQLError.createSQLException("Parameter index of '" + paramNumber + "' is greater than number of parameters, which is '" + this.parameterCount
+ "'.", SQLError.SQL_STATE_ILLEGAL_ARGUMENT, this.exceptionInterceptor);
}
}
/**
* Returns true if this either implements the interface argument or is directly or indirectly a wrapper
* for an object that does. Returns false otherwise. If this implements the interface then return true,
* else if this is a wrapper then return the result of recursively calling isWrapperFor on the wrapped
* object. If this does not implement the interface and is not a wrapper, return false.
* This method should be implemented as a low-cost operation compared to unwrap so that
* callers can use this method to avoid expensive unwrap calls that may fail. If this method
* returns true then calling unwrap with the same argument should succeed.
*
* @param interfaces
* a Class defining an interface.
* @return true if this implements the interface or directly or indirectly wraps an object that does.
* @throws java.sql.SQLException
* if an error occurs while determining whether this is a wrapper
* for an object with the given interface.
* @since 1.6
*/
public boolean isWrapperFor(Class iface) throws SQLException {
// This works for classes that aren't actually wrapping anything
return iface.isInstance(this);
}
/**
* Returns an object that implements the given interface to allow access to non-standard methods,
* or standard methods not exposed by the proxy.
* The result may be either the object found to implement the interface or a proxy for that object.
* If the receiver implements the interface then that is the object. If the receiver is a wrapper
* and the wrapped object implements the interface then that is the object. Otherwise the object is
* the result of calling unwrap recursively on the wrapped object. If the receiver is not a
* wrapper and does not implement the interface, then an SQLException is thrown.
*
* @param iface
* A Class defining an interface that the result must implement.
* @return an object that implements the interface. May be a proxy for the actual implementing object.
* @throws java.sql.SQLException
* If no object found that implements the interface
* @since 1.6
*/
public Object unwrap(Class iface) throws java.sql.SQLException {
try {
// This works for classes that aren't actually wrapping anything
return Util.cast(iface, this);
} catch (ClassCastException cce) {
throw SQLError.createSQLException("Unable to unwrap to " + iface.toString(), SQLError.SQL_STATE_ILLEGAL_ARGUMENT, this.exceptionInterceptor);
}
}
}
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