DbTemplate
package com.me.dbComponent; import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.*;
import java.util.function.Consumer;
import java.util.function.Function; /**
* Created by zgj on 2017/7/27.
*/
public abstract class DbTemplate { private <T> T execute(Function<Connection, T> function) {
Connection connection = getConnection();
try {
return function.apply(connection);
} finally {
releaseConnection(connection);
}
} protected void releaseConnection(Connection connection) {
throw new RuntimeException("the method releaseConnection not implements");
} protected Connection getConnection() {
throw new RuntimeException("the method getConnection not implements");
} public int insert(String sql, Object... args) {
return insert(sql, preparedStatement -> setParameter(preparedStatement, args));
} public int insert(String sql, Iterable<?> args) {
return insert(sql, preparedStatement -> setParameter(preparedStatement, args));
} public int insert(String sql, Map<String, Object> args) {
return insert(sql, preparedStatement -> setParameter(preparedStatement, args));
} private int insert(String sql, Consumer<PreparedStatement> statementSetter) {
return execute(connection -> {
try (PreparedStatement pst = connection.prepareStatement(sql)) {
connection.setAutoCommit(false);
if (statementSetter != null) {
statementSetter.accept(pst);
}
int count = pst.executeUpdate();
connection.commit();
return count;
} catch (SQLException e) {
try {
connection.rollback();
} catch (SQLException e1) {
throw new RuntimeException("transaction rollback occurred exception", e);
}
throw new RuntimeException(e);
}
}); } public <T> T queryObject(String sql , Function<ResultSet, T> resultSet, Object... args) {
return (T)query(sql, preparedStatement -> setParameter(preparedStatement, args), resultSet);
} private <T> T query(String sql, Consumer<PreparedStatement> consumer, Function<ResultSet, T> resultSetExtractor) {
return execute(connection -> {
try (PreparedStatement pst = connection.prepareStatement(sql)) {
if (consumer != null) {
consumer.accept(pst);
}
try (ResultSet resultSet = pst.executeQuery()) {
return resultSetExtractor.apply(resultSet);
}
} catch (SQLException e) {
throw new RuntimeException(e);
}
}); } public <T> T queryObject(String sql, Object... args) {
return (T)query(sql, preparedStatement -> setParameter(preparedStatement, args), DbTemplate::toOne);
} private <T> List<T> queryList(String sql, Consumer<PreparedStatement> statementConsumer, Function<ResultSet, T> rowMapper) {
return query(sql, statementConsumer, resultSet -> {
try {
int size = getRowSize(resultSet);
if (size == 0)
return Collections.<T>emptyList();
List<T> list = new ArrayList<>();
while (resultSet.next()) {
T t = rowMapper.apply(resultSet);
if (!Objects.isNull(t)) {
list.add(t);
}
}
return list;
} catch (SQLException e) {
throw new RuntimeException(e);
}
});
} public <T> List<T> queryList(String sql, Object[] args, Function<ResultSet, T> rowMapper) {
return queryList(sql, preparedStatement -> setParameter(preparedStatement, args), rowMapper);
} public long queryCount(String sql) {
return queryCount(sql, "");
} public long queryCount(String sql, Object... args) {
Number number = queryObject(sql,args);
return number == null ? 0L : number.longValue();
} public boolean isExist(String sql) {
return isExist(sql, "");
} public boolean isExist(String sql, Object... args) {
long count = queryCount(sql, args);
return count > 0L;
} private static Object toOne(ResultSet resultSet) {
if (getRowSize(resultSet) > 1) {
throw new RuntimeException("the result set is more than 1 row");
}
try {
int colAmount = resultSet.getMetaData().getColumnCount();
if (colAmount == 1 && resultSet.next()) {
return resultSet.getObject(1);
} else if (colAmount > 1 && resultSet.next()) {
Object[] temp = new Object[colAmount];
for (int i = 0; i < colAmount; i++) {
temp[i] = resultSet.getObject(i + 1);
}
return temp;
}
return null;
} catch (SQLException e) {
throw new RuntimeException(e);
}
} private static int getRowSize(ResultSet resultSet) {
int rows = 0;
try {
if (resultSet.last()) {
rows = resultSet.getRow();
resultSet.beforeFirst();
}
return rows;
} catch (SQLException e) {
throw new RuntimeException(e);
}
} private static void setParameter(PreparedStatement preparedStatement, Object[] args) {
if (args == null || args.length == 0) {
return;
}
try {
for (int i = 0; i < args.length; i++) {
preparedStatement.setObject(i + 1, args[i]);
}
} catch (SQLException e) {
throw new RuntimeException(e);
} } private static void setParameter(PreparedStatement preparedStatement, Iterable<?> args) {
if (args == null) {
return;
}
int index = 0;
try {
for (Iterator i = args.iterator(); i.hasNext(); ) {
preparedStatement.setObject(++index, i.next());
}
} catch (SQLException e) {
throw new RuntimeException(e);
} } private static void setParameter(PreparedStatement preparedStatement, Map<String, Object> map) {
if (map == null) {
return;
}
int index = 0;
try {
for (String key : map.keySet()) {
preparedStatement.setObject(++index, map.get(key));
}
} catch (SQLException e) {
throw new RuntimeException(e);
} } }
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