mirror of
https://github.com/moparisthebest/JdbcMapper
synced 2024-11-22 00:52:16 -05:00
Initial CompilingResultSetMapper implementation
This commit is contained in:
parent
9d131e13ce
commit
2e6fce9786
@ -0,0 +1,27 @@
|
||||
package com.moparisthebest.jdbc;
|
||||
|
||||
import com.moparisthebest.classgen.Compiler;
|
||||
|
||||
import java.sql.ResultSet;
|
||||
import java.util.Calendar;
|
||||
import java.util.HashMap;
|
||||
import java.util.Map;
|
||||
|
||||
public class CompilingResultSetMapper extends ResultSetMapper {
|
||||
|
||||
protected final Compiler compiler = new Compiler();
|
||||
protected final Map<CachingRowToObjectMapper.ResultSetKey, CompilingRowToObjectMapper.ResultSetToObject<?>> cache = new HashMap<CachingRowToObjectMapper.ResultSetKey, CompilingRowToObjectMapper.ResultSetToObject<?>>();
|
||||
|
||||
public CompilingResultSetMapper(Calendar cal, int arrayMaxLength) {
|
||||
super(cal, arrayMaxLength);
|
||||
}
|
||||
|
||||
public CompilingResultSetMapper() {
|
||||
super();
|
||||
}
|
||||
|
||||
@Override
|
||||
protected <T> RowToObjectMapper<T> getRowMapper(ResultSet resultSet, Class<T> returnTypeClass, Calendar cal, Class<?> mapValType) {
|
||||
return new CompilingRowToObjectMapper<T>(compiler, cache, resultSet, returnTypeClass, cal, mapValType);
|
||||
}
|
||||
}
|
||||
@ -0,0 +1,332 @@
|
||||
package com.moparisthebest.jdbc;
|
||||
|
||||
import com.moparisthebest.classgen.Compiler;
|
||||
|
||||
import java.lang.reflect.AccessibleObject;
|
||||
import java.lang.reflect.Field;
|
||||
import java.lang.reflect.Method;
|
||||
import java.sql.ResultSet;
|
||||
import java.sql.ResultSetMetaData;
|
||||
import java.sql.SQLException;
|
||||
import java.util.Calendar;
|
||||
import java.util.Map;
|
||||
|
||||
/**
|
||||
* Created by mopar on 5/16/17.
|
||||
*/
|
||||
public class CompilingRowToObjectMapper<T> extends RowToObjectMapper<T> {
|
||||
protected final Compiler compiler;
|
||||
protected final ResultSetToObject<T> resultSetToObject;
|
||||
|
||||
protected String[] keys = null; // for caching if we must generate class
|
||||
|
||||
public CompilingRowToObjectMapper(final Compiler compiler, final Map<CachingRowToObjectMapper.ResultSetKey, ResultSetToObject<?>> cache, ResultSet resultSet, Class<T> returnTypeClass, Calendar cal, Class<?> mapValType) {
|
||||
super(resultSet, returnTypeClass, cal, mapValType);
|
||||
this.compiler = compiler;
|
||||
try {
|
||||
final CachingRowToObjectMapper.ResultSetKey keys = new CachingRowToObjectMapper.ResultSetKey(super.getKeysFromResultSet(), _returnTypeClass);
|
||||
//System.out.printf("keys: %s\n", keys);
|
||||
@SuppressWarnings("unchecked")
|
||||
final ResultSetToObject<T> resultSetToObject = (ResultSetToObject<T>) cache.get(keys);
|
||||
if (resultSetToObject == null) {
|
||||
//System.out.printf("cache miss, keys: %s\n", keys);
|
||||
// generate and put into cache
|
||||
this.keys = keys.keys;
|
||||
cache.put(keys, this.resultSetToObject = genClass());
|
||||
this.keys = null;
|
||||
this._fields = null;
|
||||
this._fieldTypes = null;
|
||||
} else {
|
||||
//System.out.printf("cache hit, keys: %s\n", keys);
|
||||
// load from cache
|
||||
this.resultSetToObject = resultSetToObject;
|
||||
}
|
||||
} catch (SQLException e) {
|
||||
throw new MapperException("CachingRowToObjectMapper: SQLException: " + e.getMessage(), e);
|
||||
}
|
||||
}
|
||||
|
||||
@Override
|
||||
public T mapRowToReturnType() {
|
||||
try {
|
||||
return resultSetToObject.toObject(_resultSet, _cal);
|
||||
} catch (SQLException e) {
|
||||
throw new MapperException(e.getMessage(), e);
|
||||
}
|
||||
}
|
||||
|
||||
@Override
|
||||
protected String[] getKeysFromResultSet() throws SQLException {
|
||||
if (keys == null)
|
||||
throw new MapperException("not supported here");
|
||||
return keys;
|
||||
}
|
||||
|
||||
@Override
|
||||
protected void getFieldMappings() throws SQLException {
|
||||
throw new MapperException("not supported here");
|
||||
}
|
||||
|
||||
public interface ResultSetToObject<T> {
|
||||
T toObject(final ResultSet rs, final Calendar cal) throws SQLException;
|
||||
}
|
||||
|
||||
protected String typeFromName(final Class<?> type) {
|
||||
return type.getName(); // todo: naive for now
|
||||
}
|
||||
|
||||
protected String escapeJavaString(final String s) {
|
||||
// todo: escape key string, newlines, double quotes, backslashes...
|
||||
return s;
|
||||
}
|
||||
|
||||
// code generation down here
|
||||
protected ResultSetToObject<T> genClass() {
|
||||
final String className = "CompilingMapper";
|
||||
final String tType = typeFromName(_returnTypeClass);
|
||||
final String header =
|
||||
"import static com.moparisthebest.jdbc.util.ResultSetUtil.*;\n\n" +
|
||||
"public final class " + className +
|
||||
" implements com.moparisthebest.jdbc.CompilingRowToObjectMapper.ResultSetToObject<" + tType + "> {\n" +
|
||||
" public " + tType + " toObject(final java.sql.ResultSet rs, final java.util.Calendar cal) throws java.sql.SQLException {\n";
|
||||
final String footer = " }\n" +
|
||||
"}\n";
|
||||
|
||||
final StringBuilder java = new StringBuilder(header);
|
||||
//java.append("return null;\n");
|
||||
gen(java, tType);
|
||||
java.append(footer);
|
||||
//System.out.println(java);
|
||||
return compiler.compile(className, java);
|
||||
}
|
||||
|
||||
protected void gen(final StringBuilder java, final String tType) {
|
||||
|
||||
if (resultSetConstructor) {
|
||||
java.append("return new ").append(tType).append("(rs);\n");
|
||||
return;
|
||||
}
|
||||
|
||||
if (returnMap) // we want a map
|
||||
try {
|
||||
// todo: does not call getMapImplementation, I think that's fine
|
||||
java.append("final Map<String, Object> ret = new ").append(tType).append("<String, Object>();\n");
|
||||
final ResultSetMetaData md = _resultSet.getMetaData();
|
||||
final int columnLength = _columnCount + 1;
|
||||
if (componentType != null && componentType != Object.class) { // we want a specific value type
|
||||
int typeId = _tmf.getTypeId(componentType);
|
||||
for (int x = 1; x < columnLength; ++x) {
|
||||
java.append("ret.put(").append(escapeJavaString(md.getColumnName(x).toLowerCase())).append(", ");
|
||||
extractColumnValueString(java, x, typeId);
|
||||
java.append(");\n");
|
||||
}
|
||||
} else // we want a generic object type
|
||||
for (int x = 1; x < columnLength; ++x)
|
||||
java.append("ret.put(").append(escapeJavaString(md.getColumnName(x).toLowerCase())).append(", rs.getObject(").append(x).append("));\n");
|
||||
java.append("return ret;\n");
|
||||
return;
|
||||
} catch (Throwable e) {
|
||||
throw new MapperException(e.getClass().getName() + " when trying to create a Map<String, "
|
||||
+ (componentType == null ? "java.lang.Object" : componentType.getName()) + "> from a ResultSet row" +
|
||||
", all columns must be of the map value type", e);
|
||||
}
|
||||
else if (componentType != null) // we want an array
|
||||
try {
|
||||
// todo: array initialization syntax?
|
||||
java.append("final ").append(tType).append("[] ret = new ").append(tType).append("[").append(_columnCount).append("];\n");
|
||||
final int typeId = _tmf.getTypeId(componentType);
|
||||
for (int x = 0; x < _columnCount; ) {
|
||||
java.append("ret[").append(x).append("] = ");
|
||||
extractColumnValueString(java, ++x, typeId);
|
||||
java.append(";\n");
|
||||
}
|
||||
java.append("return ret;\n");
|
||||
} catch (Throwable e) {
|
||||
throw new MapperException(e.getClass().getName() + " when trying to create a "
|
||||
+ componentType.getName() + "[] from a ResultSet row, all columns must be of that type", e);
|
||||
}
|
||||
|
||||
// if the ResultSet only contains a single column we may be able to map directly
|
||||
// to the return type -- if so we don't need to build any structures to support
|
||||
// mapping
|
||||
if (_columnCount == 1) {
|
||||
|
||||
final int typeId = _tmf.getTypeId(_returnTypeClass);
|
||||
|
||||
try {
|
||||
if (typeId != TypeMappingsFactory.TYPE_UNKNOWN) {
|
||||
java.append("return ");
|
||||
extractColumnValueString(java, 1, typeId);
|
||||
java.append(";\n");
|
||||
return;
|
||||
} else {
|
||||
// we still might want a single value (i.e. java.util.Date)
|
||||
/*
|
||||
Object val = extractColumnValue(1, typeId);
|
||||
if (_returnTypeClass.isAssignableFrom(val.getClass())) {
|
||||
return _returnTypeClass.cast(val);
|
||||
}
|
||||
*/
|
||||
// we could actually pull from first row like above and test it first and fail now, but maybe just failing during compilation is enough?
|
||||
java.append("return (").append(tType).append(") ");
|
||||
extractColumnValueString(java, 1, typeId);
|
||||
java.append(";\n");
|
||||
return;
|
||||
}
|
||||
} catch (Exception e) {
|
||||
throw new MapperException(e.getMessage(), e);
|
||||
}
|
||||
}
|
||||
|
||||
if (_fields == null) {
|
||||
try {
|
||||
super.getFieldMappings();
|
||||
} catch (SQLException e) {
|
||||
throw new MapperException(e.getMessage(), e);
|
||||
}
|
||||
}
|
||||
|
||||
java.append("final ").append(tType).append(" ret = new ").append(tType).append("();\n");
|
||||
|
||||
for (int i = 1; i < _fields.length; i++) {
|
||||
AccessibleObject f = _fields[i];
|
||||
|
||||
//_args[0] = extractColumnValue(i, _fieldTypes[i]);
|
||||
//System.out.printf("field: '%s' obj: '%s' fieldType: '%s'\n", _fields[i], _args[0], _fieldTypes[i]);
|
||||
// custom hacked-in support for enums, can do better when we scrap org.apache.beehive.controls.system.jdbc.TypeMappingsFactory
|
||||
if (_fieldTypes[i] == 0) {
|
||||
final Class<?> fieldType = f instanceof Field ? ((Field) f).getType() : ((Method) f).getParameterTypes()[0];
|
||||
if (Enum.class.isAssignableFrom(fieldType)) {
|
||||
_args[0] = Enum.valueOf((Class<? extends Enum>) fieldType, (String) _args[0]);
|
||||
if (f instanceof Field) {
|
||||
// if f not accessible (but super.getFieldMappings() sets it), throw exception during compilation is fine
|
||||
java.append("ret.").append(((Field) f).getName()).append(" = ").append(typeFromName(fieldType)).append(".valueOf(");
|
||||
extractColumnValueString(java, i, _fieldTypes[i]);
|
||||
java.append(");\n");
|
||||
} else {
|
||||
java.append("ret.").append(((Method) f).getName()).append("(").append(typeFromName(fieldType)).append(".valueOf(");
|
||||
extractColumnValueString(java, i, _fieldTypes[i]);
|
||||
java.append("));\n");
|
||||
}
|
||||
}
|
||||
}
|
||||
if (f instanceof Field) {
|
||||
// if f not accessible (but super.getFieldMappings() sets it), throw exception during compilation is fine
|
||||
java.append("ret.").append(((Field) f).getName()).append(" = ");
|
||||
extractColumnValueString(java, i, _fieldTypes[i]);
|
||||
java.append(";\n");
|
||||
} else {
|
||||
java.append("ret.").append(((Method) f).getName()).append("(");
|
||||
extractColumnValueString(java, i, _fieldTypes[i]);
|
||||
java.append(");\n");
|
||||
}
|
||||
}
|
||||
// if this resultObject is Finishable, call finish()
|
||||
if (Finishable.class.isAssignableFrom(_returnTypeClass))
|
||||
java.append("ret.finish(rs);\n");
|
||||
java.append("return ret;\n");
|
||||
}
|
||||
|
||||
/**
|
||||
* Extract a column value from the ResultSet and return it as resultType.
|
||||
*
|
||||
* @param index The column index of the value to extract from the ResultSet.
|
||||
* @param resultType The return type. Defined in TypeMappingsFactory.
|
||||
* @return The extracted value
|
||||
* @throws java.sql.SQLException on error.
|
||||
*/
|
||||
protected void extractColumnValueString(final StringBuilder java, final int index, final int resultType) {
|
||||
// todo: custom boolean
|
||||
switch (resultType) {
|
||||
case TypeMappingsFactory.TYPE_INT:
|
||||
java.append("rs.getInt(").append(index).append(")");
|
||||
return;
|
||||
case TypeMappingsFactory.TYPE_LONG:
|
||||
java.append("rs.getLong(").append(index).append(")");
|
||||
return;
|
||||
case TypeMappingsFactory.TYPE_FLOAT:
|
||||
java.append("rs.getFloat(").append(index).append(")");
|
||||
return;
|
||||
case TypeMappingsFactory.TYPE_DOUBLE:
|
||||
java.append("rs.getDouble(").append(index).append(")");
|
||||
return;
|
||||
case TypeMappingsFactory.TYPE_BYTE:
|
||||
java.append("rs.getByte(").append(index).append(")");
|
||||
return;
|
||||
case TypeMappingsFactory.TYPE_SHORT:
|
||||
java.append("rs.getInt(").append(index).append(")");
|
||||
return;
|
||||
case TypeMappingsFactory.TYPE_BOOLEAN:
|
||||
java.append("rs.getInt(").append(index).append(") ? Boolean.TRUE : Boolean.FALSE");
|
||||
return;
|
||||
case TypeMappingsFactory.TYPE_INT_OBJ:
|
||||
java.append("getObjectInt(rs, ").append(index).append(")");
|
||||
return;
|
||||
case TypeMappingsFactory.TYPE_LONG_OBJ:
|
||||
java.append("getObjectLong(rs, ").append(index).append(")");
|
||||
return;
|
||||
case TypeMappingsFactory.TYPE_FLOAT_OBJ:
|
||||
java.append("getObjectFloat(rs, ").append(index).append(")");
|
||||
return;
|
||||
case TypeMappingsFactory.TYPE_DOUBLE_OBJ:
|
||||
java.append("getObjectDouble(rs, ").append(index).append(")");
|
||||
return;
|
||||
case TypeMappingsFactory.TYPE_BYTE_OBJ:
|
||||
java.append("getObjectByte(rs, ").append(index).append(")");
|
||||
return;
|
||||
case TypeMappingsFactory.TYPE_SHORT_OBJ:
|
||||
java.append("getObjectShort(rs, ").append(index).append(")");
|
||||
return;
|
||||
case TypeMappingsFactory.TYPE_BOOLEAN_OBJ:
|
||||
java.append("getObjectBoolean(rs, ").append(index).append(")");
|
||||
return;
|
||||
case TypeMappingsFactory.TYPE_STRING:
|
||||
case TypeMappingsFactory.TYPE_XMLBEAN_ENUM:
|
||||
java.append("rs.getString(").append(index).append(")");
|
||||
return;
|
||||
case TypeMappingsFactory.TYPE_BIG_DECIMAL:
|
||||
java.append("rs.getBigDecimal(").append(index).append(")");
|
||||
return;
|
||||
case TypeMappingsFactory.TYPE_BYTES:
|
||||
java.append("rs.getBytes(").append(index).append(")");
|
||||
return;
|
||||
case TypeMappingsFactory.TYPE_TIMESTAMP:
|
||||
java.append("getTimestamp(rs, cal, ").append(index).append(")");
|
||||
return;
|
||||
case TypeMappingsFactory.TYPE_TIME:
|
||||
java.append("getTime(rs, cal, ").append(index).append(")");
|
||||
return;
|
||||
case TypeMappingsFactory.TYPE_SQLDATE:
|
||||
java.append("getSqlDate(rs, cal, ").append(index).append(")");
|
||||
return;
|
||||
case TypeMappingsFactory.TYPE_DATE:
|
||||
java.append("getUtilDate(rs, cal, ").append(index).append(")");
|
||||
return;
|
||||
case TypeMappingsFactory.TYPE_CALENDAR:
|
||||
java.append("getCalendar(rs, cal, ").append(index).append(")");
|
||||
return;
|
||||
case TypeMappingsFactory.TYPE_REF:
|
||||
java.append("rs.getRef(").append(index).append(")");
|
||||
return;
|
||||
case TypeMappingsFactory.TYPE_BLOB:
|
||||
java.append("rs.getBlob(").append(index).append(")");
|
||||
return;
|
||||
case TypeMappingsFactory.TYPE_CLOB:
|
||||
java.append("rs.getClob(").append(index).append(")");
|
||||
return;
|
||||
case TypeMappingsFactory.TYPE_ARRAY:
|
||||
java.append("rs.getArray(").append(index).append(")");
|
||||
return;
|
||||
case TypeMappingsFactory.TYPE_READER:
|
||||
case TypeMappingsFactory.TYPE_STREAM:
|
||||
throw new MapperException("streaming return types are not supported by the JdbcControl; use ResultSet instead");
|
||||
case TypeMappingsFactory.TYPE_STRUCT:
|
||||
case TypeMappingsFactory.TYPE_UNKNOWN:
|
||||
// JAVA_TYPE (could be any), or REF
|
||||
java.append("rs.getObject(").append(index).append(")");
|
||||
return;
|
||||
default:
|
||||
throw new MapperException("internal error: unknown type ID: " + Integer.toString(resultType));
|
||||
}
|
||||
}
|
||||
}
|
||||
@ -0,0 +1,88 @@
|
||||
package com.moparisthebest.jdbc.util;
|
||||
|
||||
import java.sql.ResultSet;
|
||||
import java.sql.SQLException;
|
||||
import java.sql.Time;
|
||||
import java.sql.Timestamp;
|
||||
import java.util.Calendar;
|
||||
|
||||
/**
|
||||
* Created by mopar on 5/16/17.
|
||||
*/
|
||||
public class ResultSetUtil {
|
||||
|
||||
public static Integer getObjectInt(final ResultSet rs, final int index) throws SQLException {
|
||||
final int ret = rs.getInt(index);
|
||||
return rs.wasNull() ? null : ret;
|
||||
}
|
||||
|
||||
public static Long getObjectLong(final ResultSet rs, final int index) throws SQLException {
|
||||
final long ret = rs.getLong(index);
|
||||
return rs.wasNull() ? null : ret;
|
||||
}
|
||||
|
||||
public static Float getObjectFloat(final ResultSet rs, final int index) throws SQLException {
|
||||
final float ret = rs.getFloat(index);
|
||||
return rs.wasNull() ? null : ret;
|
||||
}
|
||||
|
||||
public static Double getObjectDouble(final ResultSet rs, final int index) throws SQLException {
|
||||
final double ret = rs.getDouble(index);
|
||||
return rs.wasNull() ? null : ret;
|
||||
}
|
||||
|
||||
public static Byte getObjectByte(final ResultSet rs, final int index) throws SQLException {
|
||||
final byte ret = rs.getByte(index);
|
||||
return rs.wasNull() ? null : ret;
|
||||
}
|
||||
|
||||
public static Short getObjectShort(final ResultSet rs, final int index) throws SQLException {
|
||||
final short ret = rs.getShort(index);
|
||||
return rs.wasNull() ? null : ret;
|
||||
}
|
||||
|
||||
public static Boolean getObjectBoolean(final ResultSet rs, final int index) throws SQLException {
|
||||
final boolean ret = rs.getBoolean(index);
|
||||
return rs.wasNull() ? null : (ret ? Boolean.TRUE : Boolean.FALSE);
|
||||
}
|
||||
|
||||
public static Timestamp getTimestamp(final ResultSet _resultSet, final Calendar _cal, final int index) throws SQLException {
|
||||
if (null == _cal)
|
||||
return _resultSet.getTimestamp(index);
|
||||
else
|
||||
return _resultSet.getTimestamp(index, _cal);
|
||||
}
|
||||
|
||||
public static Time getTime(final ResultSet _resultSet, final Calendar _cal, final int index) throws SQLException {
|
||||
if (null == _cal)
|
||||
return _resultSet.getTime(index);
|
||||
else
|
||||
return _resultSet.getTime(index, _cal);
|
||||
}
|
||||
|
||||
public static java.sql.Date getSqlDate(final ResultSet _resultSet, final Calendar _cal, final int index) throws SQLException {
|
||||
if (null == _cal)
|
||||
return _resultSet.getDate(index);
|
||||
else
|
||||
return _resultSet.getDate(index, _cal);
|
||||
}
|
||||
|
||||
public static java.util.Date getUtilDate(final ResultSet _resultSet, final Calendar _cal, final int index) throws SQLException {
|
||||
// convert explicity to java.util.Date
|
||||
// 12918 | knex does not return java.sql.Date properly from web service
|
||||
java.sql.Timestamp ts = (null == _cal) ? _resultSet.getTimestamp(index) : _resultSet.getTimestamp(index, _cal);
|
||||
if (null == ts)
|
||||
return null;
|
||||
return new java.util.Date(ts.getTime());
|
||||
}
|
||||
|
||||
public static Calendar getCalendar(final ResultSet _resultSet, final Calendar _cal, final int index) throws SQLException {
|
||||
java.sql.Timestamp ts = (null == _cal) ? _resultSet.getTimestamp(index) : _resultSet.getTimestamp(index, _cal);
|
||||
if (null == ts)
|
||||
return null;
|
||||
Calendar c = (null == _cal) ? Calendar.getInstance() : (Calendar) _cal.clone();
|
||||
c.setTimeInMillis(ts.getTime());
|
||||
return c;
|
||||
}
|
||||
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user