在Java中使用SQLite數據庫

一、安裝

下載最新的 Sqlite Jdbc 驅動程序jar文件，並添加到Java工程的class路徑下；

二、使用

以 sqlite Jdbc 驅動版本為 sqlitejdbc-v56.jar 為例

SqliteHelper.java 類

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
* sqlite幫助類，直接創建該類示例，並調用相應的借口即可對sqlite數據庫進行操作
*
* 本類基於 sqlite jdbc v56
*
* @author haoqipeng
*/
public class SqliteHelper {
final static Logger logger = LoggerFactory.getLogger(SqliteHelper.class);

private Connection connection;
private Statement statement;
private ResultSet resultSet;
private String dbFilePath;

/**
* 構造函數
* @param dbFilePath sqlite db 文件路徑
* @throws ClassNotFoundException
* @throws SQLException
*/
public SqliteHelper(String dbFilePath) throws ClassNotFoundException, SQLException {
this.dbFilePath = dbFilePath;
connection = getConnection(dbFilePath);
}

/**
* 獲取數據庫連接
* @param dbFilePath db文件路徑
* @return 數據庫連接
* @throws ClassNotFoundException
* @throws SQLException
*/
public Connection getConnection(String dbFilePath) throws ClassNotFoundException, SQLException {
Connection conn = null;
Class.forName("org.sqlite.JDBC");
conn = DriverManager.getConnection("jdbc:sqlite:" + dbFilePath);
return conn;
}

/**
* 執行sql查詢
* @param sql sql select 語句
* @param rse 結果集處理類對象
* @return 查詢結果
* @throws SQLException
* @throws ClassNotFoundException
*/
public <T> T executeQuery(String sql, ResultSetExtractor<T> rse) throws SQLException, ClassNotFoundException {
try {
resultSet = getStatement().executeQuery(sql);
T rs = rse.extractData(resultSet);
return rs;
} finally {
destroyed();
}
}

/**
* 執行select查詢，返回結果列表
*
* @param sql sql select 語句
* @param rm 結果集的行數據處理類對象
* @return
* @throws SQLException
* @throws ClassNotFoundException
*/
public <T> List<T> executeQuery(String sql, RowMapper<T> rm) throws SQLException, ClassNotFoundException {
List<T> rsList = new ArrayList<T>();
try {
resultSet = getStatement().executeQuery(sql);
while (resultSet.next()) {
rsList.add(rm.mapRow(resultSet, resultSet.getRow()));
}
} finally {
destroyed();
}
return rsList;
}

/**
* 執行數據庫更新sql語句
* @param sql
* @return 更新行數
* @throws SQLException
* @throws ClassNotFoundException
*/
public int executeUpdate(String sql) throws SQLException, ClassNotFoundException {
try {
int c = getStatement().executeUpdate(sql);
return c;
} finally {
destroyed();
}

}

/**
* 執行多個sql更新語句
* @param sqls
* @throws SQLException
* @throws ClassNotFoundException
*/
public void executeUpdate(String...sqls) throws SQLException, ClassNotFoundException {
try {
for (String sql : sqls) {
getStatement().executeUpdate(sql);
}
} finally {
destroyed();
}
}

/**
* 執行數據庫更新 sql List
* @param sqls sql列表
* @throws SQLException
* @throws ClassNotFoundException
*/
public void executeUpdate(List<String> sqls) throws SQLException, ClassNotFoundException {
try {
for (String sql : sqls) {
getStatement().executeUpdate(sql);
}
} finally {
destroyed();
}
}

private Connection getConnection() throws ClassNotFoundException, SQLException {
if (null == connection) connection = getConnection(dbFilePath);
return connection;
}

private Statement getStatement() throws SQLException, ClassNotFoundException {
if (null == statement) statement = getConnection().createStatement();
return statement;
}

/**
* 數據庫資源關閉和釋放
*/
public void destroyed() {
try {
if (null != connection) {
connection.close();
connection = null;
}

if (null != statement) {
statement.close();
statement = null;
}

if (null != resultSet) {
resultSet.close();
resultSet = null;
}
} catch (SQLException e) {
logger.error("Sqlite數據庫關閉時異常", e);
}
}
}

ResltSetExtractor.java 結果集處理類

import java.sql.ResultSet;

public interface ResultSetExtractor<T> {

public abstract T extractData(ResultSet rs);

}

RowMapper.java 結果集行數據處理類

import java.sql.ResultSet;
import java.sql.SQLException;

public interface RowMapper<T> {
public abstract T mapRow(ResultSet rs, int index) throws SQLException;
}

SqliteTest.java 測試類

import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.List;

import org.junit.Test;

public class SqliteTest {

@Test
public void testHelper() {
try {
SqliteHelper h = new SqliteHelper("testHelper.db");
h.executeUpdate("drop table if exists test;");
h.executeUpdate("create table test(name varchar(20));");
h.executeUpdate("insert into test values('sqliteHelper test');");
List<String> sList = h.executeQuery("select name from test", new RowMapper<String>() {
@Override
public String mapRow(ResultSet rs, int index)
throws SQLException {
return rs.getString("name");
}
});
System.out.println(sList.get(0));
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
}
}
}

測試輸出結果

sqliteHelper test

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