Here you can find the source of toSqlType(Class> clazz)
public static int toSqlType(Class<?> clazz) throws IOException
//package com.java2s; /*//from w w w . j a va2 s .c om * Copyright 2013-2015 Makoto YUI * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ import java.io.IOException; import java.sql.Timestamp; import java.sql.Types; public class Main { public static int toSqlType(Class<?> clazz) throws IOException { if (clazz == String.class) { return Types.VARCHAR; } if (clazz == Float.class) { return Types.FLOAT; } if (clazz == Double.class) { return Types.DOUBLE; } if (clazz == Boolean.class) { return Types.BOOLEAN; } if (clazz == Byte.class) { return Types.TINYINT; } if (clazz == Short.class) { return Types.SMALLINT; } if (clazz == Integer.class) { return Types.INTEGER; } if (clazz == Long.class) { return Types.BIGINT; } if (clazz == Timestamp.class) { return Types.TIMESTAMP; } if (clazz == byte[].class) { return Types.BINARY; } if (clazz.isArray()) { return Types.ARRAY; } throw new IOException("Cannot resolve SqlType for + " + clazz.getName()); } }