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org.sqlite.jdbc3.JDBC3ResultSet Maven / Gradle / Ivy
package org.sqlite.jdbc3;
import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.io.Reader;
import java.io.StringReader;
import java.math.BigDecimal;
import java.sql.Date;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.sql.SQLWarning;
import java.sql.Statement;
import java.sql.Time;
import java.sql.Timestamp;
import java.sql.Types;
import java.util.Calendar;
import java.util.GregorianCalendar;
import java.util.Locale;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.sqlite.core.CoreResultSet;
import org.sqlite.core.CoreStatement;
import org.sqlite.core.DB;
import org.sqlite.date.FastDateFormat;
public abstract class JDBC3ResultSet extends CoreResultSet {
// ResultSet Functions //////////////////////////////////////////
protected JDBC3ResultSet(CoreStatement stmt) {
super(stmt);
}
/**
* returns col in [1,x] form
*
* @see java.sql.ResultSet#findColumn(java.lang.String)
*/
public int findColumn(String col) throws SQLException {
checkOpen();
Integer index = findColumnIndexInCache(col);
if (index != null) {
return index;
}
for (int i = 0; i < cols.length; i++) {
if (col.equalsIgnoreCase(cols[i])) {
return addColumnIndexInCache(col, i + 1);
}
}
throw new SQLException("no such column: '" + col + "'");
}
/** @see java.sql.ResultSet#next() */
public boolean next() throws SQLException {
if (!open) {
return false; // finished ResultSet
}
lastCol = -1;
// first row is loaded by execute(), so do not step() again
if (row == 0) {
row++;
return true;
}
// check if we are row limited by the statement or the ResultSet
if (maxRows != 0 && row == maxRows) {
return false;
}
// do the real work
int statusCode = stmt.pointer.safeRunInt(DB::step);
switch (statusCode) {
case SQLITE_DONE:
close(); // agressive closing to avoid writer starvation
return false;
case SQLITE_ROW:
row++;
return true;
case SQLITE_BUSY:
default:
getDatabase().throwex(statusCode);
return false;
}
}
/** @see java.sql.ResultSet#getType() */
public int getType() throws SQLException {
return ResultSet.TYPE_FORWARD_ONLY;
}
/** @see java.sql.ResultSet#getFetchSize() */
public int getFetchSize() throws SQLException {
return limitRows;
}
/** @see java.sql.ResultSet#setFetchSize(int) */
public void setFetchSize(int rows) throws SQLException {
if (0 > rows || (maxRows != 0 && rows > maxRows)) {
throw new SQLException("fetch size " + rows + " out of bounds " + maxRows);
}
limitRows = rows;
}
/** @see java.sql.ResultSet#getFetchDirection() */
public int getFetchDirection() throws SQLException {
checkOpen();
return ResultSet.FETCH_FORWARD;
}
/** @see java.sql.ResultSet#setFetchDirection(int) */
public void setFetchDirection(int d) throws SQLException {
checkOpen();
// Only FORWARD_ONLY ResultSets exist in SQLite, so only FETCH_FORWARD is permitted
if (
/*getType() == ResultSet.TYPE_FORWARD_ONLY &&*/
d != ResultSet.FETCH_FORWARD) {
throw new SQLException("only FETCH_FORWARD direction supported");
}
}
/** @see java.sql.ResultSet#isAfterLast() */
public boolean isAfterLast() throws SQLException {
return !open && !emptyResultSet;
}
/** @see java.sql.ResultSet#isBeforeFirst() */
public boolean isBeforeFirst() throws SQLException {
return open && row == 0;
}
/** @see java.sql.ResultSet#isFirst() */
public boolean isFirst() throws SQLException {
return row == 1;
}
/** @see java.sql.ResultSet#isLast() */
public boolean isLast() throws SQLException { // FIXME
throw new SQLException("function not yet implemented for SQLite");
}
/** @see java.sql.ResultSet#getRow() */
public int getRow() throws SQLException {
return row;
}
/** @see java.sql.ResultSet#wasNull() */
public boolean wasNull() throws SQLException {
return safeGetColumnType(markCol(lastCol)) == SQLITE_NULL;
}
// DATA ACCESS FUNCTIONS ////////////////////////////////////////
/** @see java.sql.ResultSet#getBigDecimal(int) */
public BigDecimal getBigDecimal(int col) throws SQLException {
final int columnType = getColumnType(col);
if (columnType == Types.INTEGER) {
long decimal = getLong(col);
return BigDecimal.valueOf(decimal);
} else if (columnType == Types.FLOAT || columnType == Types.DOUBLE) {
final double decimal = getDouble(col);
if (Double.isNaN(decimal)) {
throw new SQLException("Bad value for type BigDecimal : Not a Number");
} else {
return BigDecimal.valueOf(decimal);
}
} else {
final String stringValue = getString(col);
if (stringValue == null) {
return null;
} else {
try {
return new BigDecimal(stringValue);
} catch (NumberFormatException e) {
throw new SQLException("Bad value for type BigDecimal : " + stringValue);
}
}
}
}
/** @see java.sql.ResultSet#getBigDecimal(java.lang.String) */
public BigDecimal getBigDecimal(String col) throws SQLException {
return getBigDecimal(findColumn(col));
}
/** @see java.sql.ResultSet#getBoolean(int) */
public boolean getBoolean(int col) throws SQLException {
return getInt(col) == 0 ? false : true;
}
/** @see java.sql.ResultSet#getBoolean(java.lang.String) */
public boolean getBoolean(String col) throws SQLException {
return getBoolean(findColumn(col));
}
/** @see java.sql.ResultSet#getBinaryStream(int) */
public InputStream getBinaryStream(int col) throws SQLException {
byte[] bytes = getBytes(col);
if (bytes != null) {
return new ByteArrayInputStream(bytes);
} else {
return null;
}
}
/** @see java.sql.ResultSet#getBinaryStream(java.lang.String) */
public InputStream getBinaryStream(String col) throws SQLException {
return getBinaryStream(findColumn(col));
}
/** @see java.sql.ResultSet#getByte(int) */
public byte getByte(int col) throws SQLException {
return (byte) getInt(col);
}
/** @see java.sql.ResultSet#getByte(java.lang.String) */
public byte getByte(String col) throws SQLException {
return getByte(findColumn(col));
}
/** @see java.sql.ResultSet#getBytes(int) */
public byte[] getBytes(int col) throws SQLException {
return stmt.pointer.safeRun((db, ptr) -> db.column_blob(ptr, markCol(col)));
}
/** @see java.sql.ResultSet#getBytes(java.lang.String) */
public byte[] getBytes(String col) throws SQLException {
return getBytes(findColumn(col));
}
/** @see java.sql.ResultSet#getCharacterStream(int) */
public Reader getCharacterStream(int col) throws SQLException {
String string = getString(col);
return string == null ? null : new StringReader(string);
}
/** @see java.sql.ResultSet#getCharacterStream(java.lang.String) */
public Reader getCharacterStream(String col) throws SQLException {
return getCharacterStream(findColumn(col));
}
/** @see java.sql.ResultSet#getDate(int) */
public Date getDate(int col) throws SQLException {
DB db = getDatabase();
switch (safeGetColumnType(markCol(col))) {
case SQLITE_NULL:
return null;
case SQLITE_TEXT:
try {
return new Date(
getConnectionConfig()
.getDateFormat()
.parse(safeGetColumnText(col))
.getTime());
} catch (Exception e) {
SQLException error = new SQLException("Error parsing date");
error.initCause(e);
throw error;
}
case SQLITE_FLOAT:
return new Date(julianDateToCalendar(safeGetDoubleCol(col)).getTimeInMillis());
default: // SQLITE_INTEGER:
return new Date(safeGetLongCol(col) * getConnectionConfig().getDateMultiplier());
}
}
/** @see java.sql.ResultSet#getDate(int, java.util.Calendar) */
public Date getDate(int col, Calendar cal) throws SQLException {
checkCalendar(cal);
DB db = getDatabase();
switch (safeGetColumnType(markCol(col))) {
case SQLITE_NULL:
return null;
case SQLITE_TEXT:
try {
FastDateFormat dateFormat =
FastDateFormat.getInstance(
getConnectionConfig().getDateStringFormat(), cal.getTimeZone());
return new java.sql.Date(dateFormat.parse(safeGetColumnText(col)).getTime());
} catch (Exception e) {
SQLException error = new SQLException("Error parsing time stamp");
error.initCause(e);
throw error;
}
case SQLITE_FLOAT:
return new Date(julianDateToCalendar(safeGetDoubleCol(col), cal).getTimeInMillis());
default: // SQLITE_INTEGER:
cal.setTimeInMillis(
safeGetLongCol(col) * getConnectionConfig().getDateMultiplier());
return new Date(cal.getTime().getTime());
}
}
/** @see java.sql.ResultSet#getDate(java.lang.String) */
public Date getDate(String col) throws SQLException {
return getDate(findColumn(col), Calendar.getInstance());
}
/** @see java.sql.ResultSet#getDate(java.lang.String, java.util.Calendar) */
public Date getDate(String col, Calendar cal) throws SQLException {
return getDate(findColumn(col), cal);
}
/** @see java.sql.ResultSet#getDouble(int) */
public double getDouble(int col) throws SQLException {
DB db = getDatabase();
if (safeGetColumnType(markCol(col)) == SQLITE_NULL) {
return 0;
}
return safeGetDoubleCol(col);
}
/** @see java.sql.ResultSet#getDouble(java.lang.String) */
public double getDouble(String col) throws SQLException {
return getDouble(findColumn(col));
}
/** @see java.sql.ResultSet#getFloat(int) */
public float getFloat(int col) throws SQLException {
DB db = getDatabase();
if (safeGetColumnType(markCol(col)) == SQLITE_NULL) {
return 0;
}
return (float) safeGetDoubleCol(col);
}
/** @see java.sql.ResultSet#getFloat(java.lang.String) */
public float getFloat(String col) throws SQLException {
return getFloat(findColumn(col));
}
/** @see java.sql.ResultSet#getInt(int) */
public int getInt(int col) throws SQLException {
return stmt.pointer.safeRunInt((db, ptr) -> db.column_int(ptr, markCol(col)));
}
/** @see java.sql.ResultSet#getInt(java.lang.String) */
public int getInt(String col) throws SQLException {
return getInt(findColumn(col));
}
/** @see java.sql.ResultSet#getLong(int) */
public long getLong(int col) throws SQLException {
return safeGetLongCol(col);
}
/** @see java.sql.ResultSet#getLong(java.lang.String) */
public long getLong(String col) throws SQLException {
return getLong(findColumn(col));
}
/** @see java.sql.ResultSet#getShort(int) */
public short getShort(int col) throws SQLException {
return (short) getInt(col);
}
/** @see java.sql.ResultSet#getShort(java.lang.String) */
public short getShort(String col) throws SQLException {
return getShort(findColumn(col));
}
/** @see java.sql.ResultSet#getString(int) */
public String getString(int col) throws SQLException {
return safeGetColumnText(col);
}
/** @see java.sql.ResultSet#getString(java.lang.String) */
public String getString(String col) throws SQLException {
return getString(findColumn(col));
}
/** @see java.sql.ResultSet#getTime(int) */
public Time getTime(int col) throws SQLException {
DB db = getDatabase();
switch (safeGetColumnType(markCol(col))) {
case SQLITE_NULL:
return null;
case SQLITE_TEXT:
try {
return new Time(
getConnectionConfig()
.getDateFormat()
.parse(safeGetColumnText(col))
.getTime());
} catch (Exception e) {
SQLException error = new SQLException("Error parsing time");
error.initCause(e);
throw error;
}
case SQLITE_FLOAT:
return new Time(julianDateToCalendar(safeGetDoubleCol(col)).getTimeInMillis());
default: // SQLITE_INTEGER
return new Time(safeGetLongCol(col) * getConnectionConfig().getDateMultiplier());
}
}
/** @see java.sql.ResultSet#getTime(int, java.util.Calendar) */
public Time getTime(int col, Calendar cal) throws SQLException {
checkCalendar(cal);
DB db = getDatabase();
switch (safeGetColumnType(markCol(col))) {
case SQLITE_NULL:
return null;
case SQLITE_TEXT:
try {
FastDateFormat dateFormat =
FastDateFormat.getInstance(
getConnectionConfig().getDateStringFormat(), cal.getTimeZone());
return new Time(dateFormat.parse(safeGetColumnText(col)).getTime());
} catch (Exception e) {
SQLException error = new SQLException("Error parsing time");
error.initCause(e);
throw error;
}
case SQLITE_FLOAT:
return new Time(julianDateToCalendar(safeGetDoubleCol(col), cal).getTimeInMillis());
default: // SQLITE_INTEGER
cal.setTimeInMillis(
safeGetLongCol(col) * getConnectionConfig().getDateMultiplier());
return new Time(cal.getTime().getTime());
}
}
/** @see java.sql.ResultSet#getTime(java.lang.String) */
public Time getTime(String col) throws SQLException {
return getTime(findColumn(col));
}
/** @see java.sql.ResultSet#getTime(java.lang.String, java.util.Calendar) */
public Time getTime(String col, Calendar cal) throws SQLException {
return getTime(findColumn(col), cal);
}
/** @see java.sql.ResultSet#getTimestamp(int) */
public Timestamp getTimestamp(int col) throws SQLException {
DB db = getDatabase();
switch (safeGetColumnType(markCol(col))) {
case SQLITE_NULL:
return null;
case SQLITE_TEXT:
try {
return new Timestamp(
getConnectionConfig()
.getDateFormat()
.parse(safeGetColumnText(col))
.getTime());
} catch (Exception e) {
SQLException error = new SQLException("Error parsing time stamp");
error.initCause(e);
throw error;
}
case SQLITE_FLOAT:
return new Timestamp(julianDateToCalendar(safeGetDoubleCol(col)).getTimeInMillis());
default: // SQLITE_INTEGER:
return new Timestamp(
safeGetLongCol(col) * getConnectionConfig().getDateMultiplier());
}
}
/** @see java.sql.ResultSet#getTimestamp(int, java.util.Calendar) */
public Timestamp getTimestamp(int col, Calendar cal) throws SQLException {
if (cal == null) {
return getTimestamp(col);
}
switch (safeGetColumnType(markCol(col))) {
case SQLITE_NULL:
return null;
case SQLITE_TEXT:
try {
FastDateFormat dateFormat =
FastDateFormat.getInstance(
getConnectionConfig().getDateStringFormat(), cal.getTimeZone());
return new Timestamp(dateFormat.parse(safeGetColumnText(col)).getTime());
} catch (Exception e) {
SQLException error = new SQLException("Error parsing time stamp");
error.initCause(e);
throw error;
}
case SQLITE_FLOAT:
return new Timestamp(julianDateToCalendar(safeGetDoubleCol(col)).getTimeInMillis());
default: // SQLITE_INTEGER
cal.setTimeInMillis(
safeGetLongCol(col) * getConnectionConfig().getDateMultiplier());
return new Timestamp(cal.getTime().getTime());
}
}
/** @see java.sql.ResultSet#getTimestamp(java.lang.String) */
public Timestamp getTimestamp(String col) throws SQLException {
return getTimestamp(findColumn(col));
}
/** @see java.sql.ResultSet#getTimestamp(java.lang.String, java.util.Calendar) */
public Timestamp getTimestamp(String c, Calendar ca) throws SQLException {
return getTimestamp(findColumn(c), ca);
}
/** @see java.sql.ResultSet#getObject(int) */
public Object getObject(int col) throws SQLException {
switch (safeGetColumnType(markCol(col))) {
case SQLITE_INTEGER:
long val = getLong(col);
if (val > Integer.MAX_VALUE || val < Integer.MIN_VALUE) {
return new Long(val);
} else {
return new Integer((int) val);
}
case SQLITE_FLOAT:
return new Double(getDouble(col));
case SQLITE_BLOB:
return getBytes(col);
case SQLITE_NULL:
return null;
case SQLITE_TEXT:
default:
return getString(col);
}
}
/** @see java.sql.ResultSet#getObject(java.lang.String) */
public Object getObject(String col) throws SQLException {
return getObject(findColumn(col));
}
/** @see java.sql.ResultSet#getStatement() */
public Statement getStatement() {
return (Statement) stmt;
}
/** @see java.sql.ResultSet#getCursorName() */
public String getCursorName() throws SQLException {
return null;
}
/** @see java.sql.ResultSet#getWarnings() */
public SQLWarning getWarnings() throws SQLException {
return null;
}
/** @see java.sql.ResultSet#clearWarnings() */
public void clearWarnings() throws SQLException {}
// ResultSetMetaData Functions //////////////////////////////////
/** Pattern used to extract the column type name from table column definition. */
protected static final Pattern COLUMN_TYPENAME = Pattern.compile("([^\\(]*)");
/** Pattern used to extract the column type name from a cast(col as type) */
protected static final Pattern COLUMN_TYPECAST =
Pattern.compile("cast\\(.*?\\s+as\\s+(.*?)\\s*\\)");
/**
* Pattern used to extract the precision and scale from column meta returned by the JDBC driver.
*/
protected static final Pattern COLUMN_PRECISION = Pattern.compile(".*?\\((.*?)\\)");
// we do not need to check the RS is open, only that colsMeta
// is not null, done with checkCol(int).
/** @see java.sql.ResultSet#getMetaData() */
public ResultSetMetaData getMetaData() throws SQLException {
return (ResultSetMetaData) this;
}
/** @see java.sql.ResultSetMetaData#getCatalogName(int) */
public String getCatalogName(int col) throws SQLException {
return safeGetColumnTableName(col);
}
/** @see java.sql.ResultSetMetaData#getColumnClassName(int) */
public String getColumnClassName(int col) throws SQLException {
checkCol(col);
return "java.lang.Object";
}
/** @see java.sql.ResultSetMetaData#getColumnCount() */
public int getColumnCount() throws SQLException {
checkCol(1);
return colsMeta.length;
}
/** @see java.sql.ResultSetMetaData#getColumnDisplaySize(int) */
public int getColumnDisplaySize(int col) throws SQLException {
return Integer.MAX_VALUE;
}
/** @see java.sql.ResultSetMetaData#getColumnLabel(int) */
public String getColumnLabel(int col) throws SQLException {
return getColumnName(col);
}
/** @see java.sql.ResultSetMetaData#getColumnName(int) */
public String getColumnName(int col) throws SQLException {
return safeGetColumnName(col);
}
/** @see java.sql.ResultSetMetaData#getColumnType(int) */
public int getColumnType(int col) throws SQLException {
String typeName = getColumnTypeName(col);
int valueType = safeGetColumnType(checkCol(col));
if (valueType == SQLITE_INTEGER || valueType == SQLITE_NULL) {
if ("BOOLEAN".equals(typeName)) {
return Types.BOOLEAN;
}
if ("TINYINT".equals(typeName)) {
return Types.TINYINT;
}
if ("SMALLINT".equals(typeName) || "INT2".equals(typeName)) {
return Types.SMALLINT;
}
if ("BIGINT".equals(typeName)
|| "INT8".equals(typeName)
|| "UNSIGNED BIG INT".equals(typeName)) {
return Types.BIGINT;
}
if ("DATE".equals(typeName) || "DATETIME".equals(typeName)) {
return Types.DATE;
}
if ("TIMESTAMP".equals(typeName)) {
return Types.TIMESTAMP;
}
if (valueType == SQLITE_INTEGER
|| "INT".equals(typeName)
|| "INTEGER".equals(typeName)
|| "MEDIUMINT".equals(typeName)) {
return Types.INTEGER;
}
}
if (valueType == SQLITE_FLOAT || valueType == SQLITE_NULL) {
if ("DECIMAL".equals(typeName)) {
return Types.DECIMAL;
}
if ("DOUBLE".equals(typeName) || "DOUBLE PRECISION".equals(typeName)) {
return Types.DOUBLE;
}
if ("NUMERIC".equals(typeName)) {
return Types.NUMERIC;
}
if ("REAL".equals(typeName)) {
return Types.REAL;
}
if (valueType == SQLITE_FLOAT || "FLOAT".equals(typeName)) {
return Types.FLOAT;
}
}
if (valueType == SQLITE_TEXT || valueType == SQLITE_NULL) {
if ("CHARACTER".equals(typeName)
|| "NCHAR".equals(typeName)
|| "NATIVE CHARACTER".equals(typeName)
|| "CHAR".equals(typeName)) {
return Types.CHAR;
}
if ("CLOB".equals(typeName)) {
return Types.CLOB;
}
if ("DATE".equals(typeName) || "DATETIME".equals(typeName)) {
return Types.DATE;
}
if (valueType == SQLITE_TEXT
|| "VARCHAR".equals(typeName)
|| "VARYING CHARACTER".equals(typeName)
|| "NVARCHAR".equals(typeName)
|| "TEXT".equals(typeName)) {
return Types.VARCHAR;
}
}
if (valueType == SQLITE_BLOB || valueType == SQLITE_NULL) {
if ("BINARY".equals(typeName)) {
return Types.BINARY;
}
if (valueType == SQLITE_BLOB || "BLOB".equals(typeName)) {
return Types.BLOB;
}
}
return Types.NUMERIC;
}
/**
* @return The data type from either the 'create table' statement, or CAST(expr AS TYPE)
* otherwise sqlite3_value_type.
* @see java.sql.ResultSetMetaData#getColumnTypeName(int)
*/
public String getColumnTypeName(int col) throws SQLException {
String declType = getColumnDeclType(col);
if (declType != null) {
Matcher matcher = COLUMN_TYPENAME.matcher(declType);
matcher.find();
return matcher.group(1).toUpperCase(Locale.ENGLISH);
}
switch (safeGetColumnType(checkCol(col))) {
case SQLITE_INTEGER:
return "INTEGER";
case SQLITE_FLOAT:
return "FLOAT";
case SQLITE_BLOB:
return "BLOB";
case SQLITE_TEXT:
return "TEXT";
case SQLITE_NULL:
default:
return "NUMERIC";
}
}
/** @see java.sql.ResultSetMetaData#getPrecision(int) */
public int getPrecision(int col) throws SQLException {
String declType = getColumnDeclType(col);
if (declType != null) {
Matcher matcher = COLUMN_PRECISION.matcher(declType);
return matcher.find() ? Integer.parseInt(matcher.group(1).split(",")[0].trim()) : 0;
}
return 0;
}
private String getColumnDeclType(int col) throws SQLException {
String declType = stmt.pointer.safeRun((db, ptr) -> db.column_decltype(ptr, checkCol(col)));
if (declType == null) {
Matcher matcher = COLUMN_TYPECAST.matcher(safeGetColumnName(col));
declType = matcher.find() ? matcher.group(1) : null;
}
return declType;
}
/** @see java.sql.ResultSetMetaData#getScale(int) */
public int getScale(int col) throws SQLException {
String declType = getColumnDeclType(col);
if (declType != null) {
Matcher matcher = COLUMN_PRECISION.matcher(declType);
if (matcher.find()) {
String array[] = matcher.group(1).split(",");
if (array.length == 2) {
return Integer.parseInt(array[1].trim());
}
}
}
return 0;
}
/** @see java.sql.ResultSetMetaData#getSchemaName(int) */
public String getSchemaName(int col) throws SQLException {
return "";
}
/** @see java.sql.ResultSetMetaData#getTableName(int) */
public String getTableName(int col) throws SQLException {
final String tableName = safeGetColumnTableName(col);
if (tableName == null) {
// JDBC specifies an empty string instead of null
return "";
}
return tableName;
}
/** @see java.sql.ResultSetMetaData#isNullable(int) */
public int isNullable(int col) throws SQLException {
checkMeta();
return meta[checkCol(col)][1]
? ResultSetMetaData.columnNoNulls
: ResultSetMetaData.columnNullable;
}
/** @see java.sql.ResultSetMetaData#isAutoIncrement(int) */
public boolean isAutoIncrement(int col) throws SQLException {
checkMeta();
return meta[checkCol(col)][2];
}
/** @see java.sql.ResultSetMetaData#isCaseSensitive(int) */
public boolean isCaseSensitive(int col) throws SQLException {
return true;
}
/** @see java.sql.ResultSetMetaData#isCurrency(int) */
public boolean isCurrency(int col) throws SQLException {
return false;
}
/** @see java.sql.ResultSetMetaData#isDefinitelyWritable(int) */
public boolean isDefinitelyWritable(int col) throws SQLException {
return true;
} // FIXME: check db file constraints?
/** @see java.sql.ResultSetMetaData#isReadOnly(int) */
public boolean isReadOnly(int col) throws SQLException {
return false;
}
/** @see java.sql.ResultSetMetaData#isSearchable(int) */
public boolean isSearchable(int col) throws SQLException {
return true;
}
/** @see java.sql.ResultSetMetaData#isSigned(int) */
public boolean isSigned(int col) throws SQLException {
String typeName = getColumnTypeName(col);
return "NUMERIC".equals(typeName) || "INTEGER".equals(typeName) || "REAL".equals(typeName);
}
/** @see java.sql.ResultSetMetaData#isWritable(int) */
public boolean isWritable(int col) throws SQLException {
return true;
}
/** @see java.sql.ResultSet#getConcurrency() */
public int getConcurrency() throws SQLException {
return ResultSet.CONCUR_READ_ONLY;
}
/** @see java.sql.ResultSet#rowDeleted() */
public boolean rowDeleted() throws SQLException {
return false;
}
/** @see java.sql.ResultSet#rowInserted() */
public boolean rowInserted() throws SQLException {
return false;
}
/** @see java.sql.ResultSet#rowUpdated() */
public boolean rowUpdated() throws SQLException {
return false;
}
/** Transforms a Julian Date to java.util.Calendar object. */
private Calendar julianDateToCalendar(Double jd) {
return julianDateToCalendar(jd, Calendar.getInstance());
}
/**
* Transforms a Julian Date to java.util.Calendar object. Based on Guine Christian's function
* found here:
* http://java.ittoolbox.com/groups/technical-functional/java-l/java-function-to-convert-julian-date-to-calendar-date-1947446
*/
private Calendar julianDateToCalendar(Double jd, Calendar cal) {
if (jd == null) {
return null;
}
int yyyy, dd, mm, hh, mn, ss, ms, A;
double w = jd + 0.5;
int Z = (int) w;
double F = w - Z;
if (Z < 2299161) {
A = Z;
} else {
int alpha = (int) ((Z - 1867216.25) / 36524.25);
A = Z + 1 + alpha - (int) (alpha / 4.0);
}
int B = A + 1524;
int C = (int) ((B - 122.1) / 365.25);
int D = (int) (365.25 * C);
int E = (int) ((B - D) / 30.6001);
// month
mm = E - ((E < 13.5) ? 1 : 13);
// year
yyyy = C - ((mm > 2.5) ? 4716 : 4715);
// Day
double jjd = B - D - (int) (30.6001 * E) + F;
dd = (int) jjd;
// Hour
double hhd = jjd - dd;
hh = (int) (24 * hhd);
// Minutes
double mnd = (24 * hhd) - hh;
mn = (int) (60 * mnd);
// Seconds
double ssd = (60 * mnd) - mn;
ss = (int) (60 * ssd);
// Milliseconds
double msd = (60 * ssd) - ss;
ms = (int) (1000 * msd);
cal.set(yyyy, mm - 1, dd, hh, mn, ss);
cal.set(Calendar.MILLISECOND, ms);
if (yyyy < 1) {
cal.set(Calendar.ERA, GregorianCalendar.BC);
cal.set(Calendar.YEAR, -(yyyy - 1));
}
return cal;
}
public void checkCalendar(Calendar cal) throws SQLException {
if (cal != null) return;
SQLException e = new SQLException("Expected a calendar instance.");
e.initCause(new NullPointerException());
throw e;
}
private int safeGetColumnType(int col) throws SQLException {
return stmt.pointer.safeRunInt((db, ptr) -> db.column_type(ptr, col));
}
private long safeGetLongCol(int col) throws SQLException {
return stmt.pointer.safeRunLong((db, ptr) -> db.column_long(ptr, markCol(col)));
}
private double safeGetDoubleCol(int col) throws SQLException {
return stmt.pointer.safeRunDouble((db, ptr) -> db.column_double(ptr, markCol(col)));
}
private String safeGetColumnText(int col) throws SQLException {
return stmt.pointer.safeRun((db, ptr) -> db.column_text(ptr, markCol(col)));
}
private String safeGetColumnTableName(int col) throws SQLException {
return stmt.pointer.safeRun((db, ptr) -> db.column_table_name(ptr, checkCol(col)));
}
private String safeGetColumnName(int col) throws SQLException {
return stmt.pointer.safeRun((db, ptr) -> db.column_name(ptr, checkCol(col)));
}
}
