/** 统计数据源的一些信息 */
public void info() {
if (closed) {
Log.w(tag, "DataSource is closed.");
return;
}
pool.staticsInfo();
}
/**
* 创建数据源
*
* @return 创建好的数据源
* @throws SQLException
*/
protected DataSource createDataSource() throws SQLException {
if (closed) throw new SQLException("The DataSource is closed.");
if (dataSource != null) {
return dataSource;
}
synchronized (this) {
if (dataSource != null) return dataSource;
Driver driverToUse = this.driver;
if (driverToUse == null) {
Class<?> driverFromCCL = null;
if (driverClassName != null) {
try {
driverFromCCL = Class.forName(driverClassName);
} catch (ClassNotFoundException e) {
Log.e(e, tag, "Cannot load JDBC driver class " + driverClassName);
throw new SQLException(e);
}
}
try {
if (driverFromCCL == null) {
driverToUse = DriverManager.getDriver(url);
} else {
driverToUse = (Driver) driverFromCCL.newInstance();
if (!driverToUse.acceptsURL(url)) {
throw new SQLException("No suitable driver", "08001");
}
}
} catch (Exception e) {
Log.e(
e,
tag,
"Cannot create JDBC driver of class %s for connection url %s",
driverClassName != null ? driverClassName : "",
url);
throw new SQLException(e);
}
this.driver = driverToUse;
}
String user = userName;
if (user != null) {
props.put("user", user);
} else {
Log.w(tag, "DataSource configured without a 'username'");
}
String pwd = password;
if (pwd != null) {
props.put("password", pwd);
} else {
Log.w(tag, "DataSource configured without a 'password'");
}
try {
connectionFactory = new JdbcConnectionFactory(driver, url, props);
jdbcConnectionValidator = new JdbcConnectionValidator();
pool =
new BoundedBlockingPool<>(maxConnections, jdbcConnectionValidator, connectionFactory);
dataSource = new PooledDataSource<>(pool);
dataSource.setLogWriter(logWriter);
} catch (SQLException e) {
Log.e(e, tag, "Cannot create a datasource.");
throw new SQLException(e);
}
return dataSource;
}
}