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Last active September 11, 2015 02:35
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SQL関連のユーティリティクラス
import android.content.res.AssetManager;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;
public class SqlUtil {
/**
* @param sqlFile
* @param assetManager
* @return
* @throws IOException
*/
public static List<String> parseSqlFile(String sqlFile, AssetManager assetManager) throws IOException {
List<String> sqlIns = null ;
InputStream is = assetManager.open(sqlFile);
try {
sqlIns = parseSqlFile(is);
} finally {
is.close();
}
return sqlIns;
}
/**
* @param is
* @return
* @throws IOException
*/
public static List<String> parseSqlFile(InputStream is) throws IOException {
String script = removeComments(is);
return splitSqlScript(script, ';');
}
/**
* @param is
* @return
* @throws IOException
*/
private static String removeComments(InputStream is) throws IOException {
StringBuilder sql = new StringBuilder();
InputStreamReader isReader = new InputStreamReader(is);
try {
BufferedReader buffReader = new BufferedReader(isReader);
try {
String line;
String multiLineComment = null;
while ((line = buffReader.readLine()) != null) {
line = line.trim();
// Check for start of multi-line comment
if (multiLineComment == null) {
// Check for first multi-line comment type
if (line.startsWith("/*")) {
if (!line.endsWith("*/")) {
multiLineComment = "/*";
}
// Check for second multi-line comment type
} else if (line.startsWith("{")) {
if (!line.endsWith("}")) {
multiLineComment = "{";
}
// Append line if line is not empty or a single line
// comment
} else if (!line.startsWith("--") && !line.equals("")) {
sql.append(line);
} // Check for matching end comment
} else if (multiLineComment.equals("/*")) {
if (line.endsWith("*/")) {
multiLineComment = null;
}
// Check for matching end comment
} else if (multiLineComment.equals("{")) {
if (line.endsWith("}")) {
multiLineComment = null;
}
}
}
} finally {
buffReader.close();
}
} finally {
isReader.close();
}
return sql.toString();
}
/**
* Split an SQL script into separate statements delimited with the provided
* delimiter character. Each individual statement will be added to the
* provided <code>List</code>.
*
* @param script
* the SQL script
* @param delim
* character delimiting each statement - typically a ';'
* character
*/
private static List<String> splitSqlScript(String script, char delim) {
List<String> statements = new ArrayList<>();
StringBuilder sb = new StringBuilder();
boolean inLiteral = false;
char[] content = script.toCharArray();
for (int i = 0; i < script.length(); i++) {
if (content[i] == '\'') {
inLiteral = !inLiteral;
}
if (content[i] == delim && !inLiteral) {
if (sb.length() > 0) {
statements.add(sb.toString().trim());
sb = new StringBuilder();
}
} else {
sb.append(content[i]);
}
}
if (sb.length() > 0) {
statements.add(sb.toString().trim());
}
return statements;
}
}
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