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/*
* Copyright 2002-2017 the original author or authors.
*
* 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.
*/
package org.springframework.test.jdbc;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.SqlParameterValue;
import org.springframework.util.StringUtils;
/**
* {@code JdbcTestUtils} is a collection of JDBC related utility functions
* intended to simplify standard database testing scenarios.
*
* @author Thomas Risberg
* @author Sam Brannen
* @author Juergen Hoeller
* @author Phillip Webb
* @author Chris Baldwin
* @since 2.5.4
* @see org.springframework.jdbc.core.JdbcTemplate
* @see org.springframework.jdbc.datasource.init.ScriptUtils
* @see org.springframework.jdbc.datasource.init.ResourceDatabasePopulator
* @see org.springframework.jdbc.datasource.init.DatabasePopulatorUtils
*/
public class JdbcTestUtils {
private static final Log logger = LogFactory.getLog(JdbcTestUtils.class);
/**
* Count the rows in the given table.
* @param jdbcTemplate the JdbcTemplate with which to perform JDBC operations
* @param tableName name of the table to count rows in
* @return the number of rows in the table
*/
public static int countRowsInTable(JdbcTemplate jdbcTemplate, String tableName) {
Integer result = jdbcTemplate.queryForObject("SELECT COUNT(0) FROM " + tableName, Integer.class);
return (result != null ? result : 0);
}
/**
* Count the rows in the given table, using the provided {@code WHERE} clause.
* If the provided {@code WHERE} clause contains text, it will be prefixed
* with {@code " WHERE "} and then appended to the generated {@code SELECT}
* statement. For example, if the provided table name is {@code "person"} and
* the provided where clause is {@code "name = 'Bob' and age > 25"}, the
* resulting SQL statement to execute will be
* {@code "SELECT COUNT(0) FROM person WHERE name = 'Bob' and age > 25"}.
* @param jdbcTemplate the JdbcTemplate with which to perform JDBC operations
* @param tableName the name of the table to count rows in
* @param whereClause the {@code WHERE} clause to append to the query
* @return the number of rows in the table that match the provided
* {@code WHERE} clause
*/
public static int countRowsInTableWhere(JdbcTemplate jdbcTemplate, String tableName, String whereClause) {
String sql = "SELECT COUNT(0) FROM " + tableName;
if (StringUtils.hasText(whereClause)) {
sql += " WHERE " + whereClause;
}
Integer result = jdbcTemplate.queryForObject(sql, Integer.class);
return (result != null ? result : 0);
}
/**
* Delete all rows from the specified tables.
* @param jdbcTemplate the JdbcTemplate with which to perform JDBC operations
* @param tableNames the names of the tables to delete from
* @return the total number of rows deleted from all specified tables
*/
public static int deleteFromTables(JdbcTemplate jdbcTemplate, String... tableNames) {
int totalRowCount = 0;
for (String tableName : tableNames) {
int rowCount = jdbcTemplate.update("DELETE FROM " + tableName);
totalRowCount += rowCount;
if (logger.isInfoEnabled()) {
logger.info("Deleted " + rowCount + " rows from table " + tableName);
}
}
return totalRowCount;
}
/**
* Delete rows from the given table, using the provided {@code WHERE} clause.
*
If the provided {@code WHERE} clause contains text, it will be prefixed
* with {@code " WHERE "} and then appended to the generated {@code DELETE}
* statement. For example, if the provided table name is {@code "person"} and
* the provided where clause is {@code "name = 'Bob' and age > 25"}, the
* resulting SQL statement to execute will be
* {@code "DELETE FROM person WHERE name = 'Bob' and age > 25"}.
*
As an alternative to hard-coded values, the {@code "?"} placeholder can
* be used within the {@code WHERE} clause, binding to the given arguments.
* @param jdbcTemplate the JdbcTemplate with which to perform JDBC operations
* @param tableName the name of the table to delete rows from
* @param whereClause the {@code WHERE} clause to append to the query
* @param args arguments to bind to the query (leaving it to the PreparedStatement
* to guess the corresponding SQL type); may also contain {@link SqlParameterValue}
* objects which indicate not only the argument value but also the SQL type and
* optionally the scale.
* @return the number of rows deleted from the table
*/
public static int deleteFromTableWhere(
JdbcTemplate jdbcTemplate, String tableName, String whereClause, Object... args) {
String sql = "DELETE FROM " + tableName;
if (StringUtils.hasText(whereClause)) {
sql += " WHERE " + whereClause;
}
int rowCount = (args.length > 0 ? jdbcTemplate.update(sql, args) : jdbcTemplate.update(sql));
if (logger.isInfoEnabled()) {
logger.info("Deleted " + rowCount + " rows from table " + tableName);
}
return rowCount;
}
/**
* Drop the specified tables.
* @param jdbcTemplate the JdbcTemplate with which to perform JDBC operations
* @param tableNames the names of the tables to drop
*/
public static void dropTables(JdbcTemplate jdbcTemplate, String... tableNames) {
for (String tableName : tableNames) {
jdbcTemplate.execute("DROP TABLE " + tableName);
if (logger.isInfoEnabled()) {
logger.info("Dropped table " + tableName);
}
}
}
}