Java SQL Table Column isColumnNullable(Connection conn, String table, String column)

Description

is Column Nullable

License

Apache License

Declaration

public static boolean isColumnNullable(Connection conn, String table, String column) throws SQLException 

Method Source Code

//package com.java2s;
/**/*from w w  w  .j ava2  s  .c  o m*/
 * Copyright 2015 Confluent Inc.
 *
 * 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.sql.Connection;

import java.sql.ResultSet;

import java.sql.SQLException;

public class Main {
    private static final int GET_COLUMNS_IS_NULLABLE = 18;

    public static boolean isColumnNullable(Connection conn, String table, String column) throws SQLException {
        ResultSet rs = conn.getMetaData().getColumns(null, null, table, column);
        if (rs.getMetaData().getColumnCount() > GET_COLUMNS_IS_NULLABLE) {
            // Should only be one match
            if (!rs.next()) {
                return false;
            }
            String val = rs.getString(GET_COLUMNS_IS_NULLABLE);
            return rs.getString(GET_COLUMNS_IS_NULLABLE).equals("YES");
        }

        return false;
    }
}

Related

1. hasColumn(String columnName, ResultSet resultSet)
2. hasColumn(String field, ResultSet rs)
3. hasColumns(Connection conn, String tableName, Collection colNames)
4. hasTableAndColumns(Connection conn, String tableName, String... colNames)
5. indent_DisplayBanner(PrintWriter out, ResultSetMetaData rsmd, int indentLevel, int[] displayColumns, int[] displayColumnWidths)
6. isColumnNullable(Connection conn, String table, String column)
7. isNull(ResultSet resultSet, String columnName)
8. lookupColumnIndex(final ResultSetMetaData resultSetMetaData, final String columnName)
9. lookupColumnIndex(ResultSetMetaData resultSetMetaData, String name)