/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.openjpa.jdbc.sql;
import java.lang.reflect.Method;
import java.sql.Connection;
import java.sql.DatabaseMetaData;
import java.sql.SQLException;
import java.sql.Types;
import java.util.Arrays;
import java.util.StringTokenizer;
import org.apache.openjpa.jdbc.kernel.JDBCFetchConfiguration;
import org.apache.openjpa.jdbc.kernel.exps.FilterValue;
import org.apache.openjpa.jdbc.kernel.exps.Lit;
import org.apache.openjpa.jdbc.kernel.exps.Param;
import org.apache.openjpa.jdbc.kernel.exps.Val;
import org.apache.openjpa.jdbc.schema.Column;
import org.apache.openjpa.jdbc.schema.Index;
import org.apache.openjpa.jdbc.schema.Schema;
import org.apache.openjpa.jdbc.schema.Sequence;
import org.apache.openjpa.jdbc.schema.Table;
import org.apache.openjpa.kernel.Filters;
import org.apache.openjpa.lib.util.Localizer;
import org.apache.openjpa.meta.JavaTypes;
import org.apache.openjpa.util.OpenJPAException;
import org.apache.openjpa.util.UnsupportedException;
import serp.util.Strings;
/**
* Dictionary for IBM DB2 database.
*/
public class DB2Dictionary
extends AbstractDB2Dictionary {
private static final Localizer _loc = Localizer.forPackage
(DB2Dictionary.class);
public String optimizeClause = "optimize for";
public String rowClause = "row";
protected int db2ServerType = 0;
public static final int db2ISeriesV5R3OrEarlier = 1;
public static final int db2UDBV81OrEarlier = 2;
public static final int db2ZOSV8xOrLater = 3;
public static final int db2UDBV82OrLater = 4;
public static final int db2ISeriesV5R4OrLater = 5;
protected static final String forUpdate = "FOR UPDATE";
protected static final String withURClause = "WITH UR";
protected static final String withCSClause = "WITH CS";
protected static final String withRSClause = "WITH RS";
protected static final String withRRClause = "WITH RR";
protected static final String useKeepShareLockClause
= "USE AND KEEP SHARE LOCKS";
protected static final String useKeepUpdateLockClause
= "USE AND KEEP UPDATE LOCKS";
protected static final String useKeepExclusiveLockClause
= "USE AND KEEP EXCLUSIVE LOCKS";
protected static final String forReadOnlyClause = "FOR READ ONLY";
protected String databaseProductName = "";
protected String databaseProductVersion = "";
protected int maj = 0;
protected int min = 0;
private int defaultBatchLimit = 100;
public DB2Dictionary() {
platform = "DB2";
validationSQL = "SELECT DISTINCT(CURRENT TIMESTAMP) FROM "
+ "SYSIBM.SYSTABLES";
supportsSelectEndIndex = true;
nextSequenceQuery = "VALUES NEXTVAL FOR {0}";
sequenceSQL = "SELECT SEQSCHEMA AS SEQUENCE_SCHEMA, "
+ "SEQNAME AS SEQUENCE_NAME FROM SYSCAT.SEQUENCES";
sequenceSchemaSQL = "SEQSCHEMA = ?";
sequenceNameSQL = "SEQNAME = ?";
characterColumnSize = 254;
binaryTypeName = "BLOB(1M)";
longVarbinaryTypeName = "BLOB(1M)";
varbinaryTypeName = "BLOB(1M)";
clobTypeName = "CLOB(1M)";
longVarcharTypeName = "LONG VARCHAR";
datePrecision = MICRO;
storeCharsAsNumbers = false;
fixedSizeTypeNameSet.addAll(Arrays.asList(new String[]{
"LONG VARCHAR FOR BIT DATA", "LONG VARCHAR", "LONG VARGRAPHIC",
}));
systemSchemas = new String(
"SYSCAT,SYSIBM,SYSSTAT,SYSIBMADM,SYSTOOLS");
maxConstraintNameLength = 18;
maxIndexNameLength = 18;
maxColumnNameLength = 30;
supportsDeferredConstraints = false;
supportsDefaultDeleteAction = false;
supportsAlterTableWithDropColumn = false;
supportsNullTableForGetColumns = false;
requiresCastForMathFunctions = true;
requiresCastForComparisons = true;
reservedWordSet.addAll(Arrays.asList(new String[]{
"AFTER", "ALIAS", "ALLOW", "APPLICATION", "ASSOCIATE", "ASUTIME",
"AUDIT", "AUX", "AUXILIARY", "BEFORE", "BINARY", "BUFFERPOOL",
"CACHE", "CALL", "CALLED", "CAPTURE", "CARDINALITY", "CCSID",
"CLUSTER", "COLLECTION", "COLLID", "COMMENT", "CONCAT",
"CONDITION", "CONTAINS", "COUNT_BIG", "CURRENT_LC_CTYPE",
"CURRENT_PATH", "CURRENT_SERVER", "CURRENT_TIMEZONE", "CYCLE",
"DATA", "DATABASE", "DAYS", "DB2GENERAL", "DB2GENRL", "DB2SQL",
"DBINFO", "DEFAULTS", "DEFINITION", "DETERMINISTIC", "DISALLOW",
"DO", "DSNHATTR", "DSSIZE", "DYNAMIC", "EACH", "EDITPROC", "ELSEIF",
"ENCODING", "END-EXEC1", "ERASE", "EXCLUDING", "EXIT", "FENCED",
"FIELDPROC", "FILE", "FINAL", "FREE", "FUNCTION", "GENERAL",
"GENERATED", "GRAPHIC", "HANDLER", "HOLD", "HOURS", "IF",
"INCLUDING", "INCREMENT", "INDEX", "INHERIT", "INOUT", "INTEGRITY",
"ISOBID", "ITERATE", "JAR", "JAVA", "LABEL", "LC_CTYPE", "LEAVE",
"LINKTYPE", "LOCALE", "LOCATOR", "LOCATORS", "LOCK", "LOCKMAX",
"LOCKSIZE", "LONG", "LOOP", "MAXVALUE", "MICROSECOND",
"MICROSECONDS", "MINUTES", "MINVALUE", "MODE", "MODIFIES", "MONTHS",
"NEW", "NEW_TABLE", "NOCACHE", "NOCYCLE", "NODENAME", "NODENUMBER",
"NOMAXVALUE", "NOMINVALUE", "NOORDER", "NULLS", "NUMPARTS", "OBID",
"OLD", "OLD_TABLE", "OPTIMIZATION", "OPTIMIZE", "OUT", "OVERRIDING",
"PACKAGE", "PARAMETER", "PART", "PARTITION", "PATH", "PIECESIZE",
"PLAN", "PRIQTY", "PROGRAM", "PSID", "QUERYNO", "READS", "RECOVERY",
"REFERENCING", "RELEASE", "RENAME", "REPEAT", "RESET", "RESIGNAL",
"RESTART", "RESULT", "RESULT_SET_LOCATOR", "RETURN", "RETURNS",
"ROUTINE", "ROW", "RRN", "RUN", "SAVEPOINT", "SCRATCHPAD",
"SECONDS", "SECQTY", "SECURITY", "SENSITIVE", "SIGNAL", "SIMPLE",
"SOURCE", "SPECIFIC", "SQLID", "STANDARD", "START", "STATIC",
"STAY", "STOGROUP", "STORES", "STYLE", "SUBPAGES", "SYNONYM",
"SYSFUN", "SYSIBM", "SYSPROC", "SYSTEM", "TABLESPACE", "TRIGGER",
"TYPE", "UNDO", "UNTIL", "VALIDPROC", "VARIABLE", "VARIANT", "VCAT",
"VOLUMES", "WHILE", "WLM", "YEARS",
}));
super.setBatchLimit(defaultBatchLimit);
selectWordSet.add("WITH");
}
public boolean supportsRandomAccessResultSet(Select sel,
boolean forUpdate) {
return !forUpdate
&& super.supportsRandomAccessResultSet(sel, forUpdate);
}
protected void appendSelectRange(SQLBuffer buf, long start, long end,
boolean subselect) {
// appends the literal range string, since DB2 is unable to handle
// a bound parameter for it
// do not generate FETCH FIRST clause for subselect
if (!subselect)
buf.append(" FETCH FIRST ").append(Long.toString(end)).
append(" ROWS ONLY");
}
protected void appendSelect(SQLBuffer selectSQL, Object alias, Select sel,
int idx) {
// if this is a literal value, add a cast...
Object val = sel.getSelects().get(idx);
if (val instanceof Lit)
selectSQL.append("CAST(");
// ... and add the select per super's behavior...
super.appendSelect(selectSQL, alias, sel, idx);
// ... and finish the cast
if (val instanceof Lit) {
Class c = ((Lit) val).getType();
int javaTypeCode = JavaTypes.getTypeCode(c);
int jdbcTypeCode = getJDBCType(javaTypeCode, false);
String typeName = getTypeName(jdbcTypeCode);
selectSQL.append(" AS " + typeName);
// if the literal is a string, use the default char col size
// in the cast statement.
if (String.class.equals(c))
selectSQL.append("(" + characterColumnSize + ")");
selectSQL.append(")");
}
}
public String[] getCreateSequenceSQL(Sequence seq) {
String[] sql = super.getCreateSequenceSQL(seq);
if (seq.getAllocate() > 1)
sql[0] += " CACHE " + seq.getAllocate();
return sql;
}
protected String getSequencesSQL(String schemaName, String sequenceName) {
StringBuffer buf = new StringBuffer();
buf.append(sequenceSQL);
if (schemaName != null || sequenceName != null)
buf.append(" WHERE ");
if (schemaName != null) {
buf.append(sequenceSchemaSQL);
if (sequenceName != null)
buf.append(" AND ");
}
if (sequenceName != null)
buf.append(sequenceNameSQL);
return buf.toString();
}
public Connection decorate(Connection conn)
throws SQLException {
// some versions of the DB2 driver seem to default to
// READ_UNCOMMITTED, which will prevent locking from working
// (multiple SELECT ... FOR UPDATE statements are allowed on
// the same instance); if we have not overridden the
// transaction isolation in the configuration, default to
// TRANSACTION_READ_COMMITTED
conn = super.decorate(conn);
if (conf.getTransactionIsolationConstant() == -1
&& conn.getTransactionIsolation() < conn.TRANSACTION_READ_COMMITTED)
conn.setTransactionIsolation(conn.TRANSACTION_READ_COMMITTED);
return conn;
}
public void connectedConfiguration(Connection conn) throws SQLException {
super.connectedConfiguration(conn);
DatabaseMetaData metaData = conn.getMetaData();
databaseProductName = nullSafe(metaData.getDatabaseProductName());
databaseProductVersion = nullSafe(metaData.getDatabaseProductVersion());
// Determine the type of DB2 database
// First check for AS/400
getProductVersionMajorMinorForISeries();
if (maj > 0) {
if (isDB2ISeriesV5R3OrEarlier())
db2ServerType = db2ISeriesV5R3OrEarlier;
else if (isDB2ISeriesV5R4OrLater())
db2ServerType = db2ISeriesV5R4OrLater;
}
if (db2ServerType == 0) {
if (isJDBC3) {
maj = metaData.getDatabaseMajorVersion();
min = metaData.getDatabaseMinorVersion();
}
else
getProductVersionMajorMinor();
// Determine the type of DB2 database for ZOS & UDB
if (isDB2UDBV81OrEarlier())
db2ServerType = db2UDBV81OrEarlier;
else if (isDB2ZOSV8xOrLater())
db2ServerType = db2ZOSV8xOrLater;
else if (isDB2UDBV82OrLater())
db2ServerType = db2UDBV82OrLater;
}
// verify that databae product is supported
if (db2ServerType == 0 || maj == 0)
throw new UnsupportedException(_loc.get("db-not-supported",
new Object[] {databaseProductName, databaseProductVersion }));
if (maj >= 9 || (maj == 8 && min >= 2)) {
supportsLockingWithMultipleTables = true;
supportsLockingWithInnerJoin = true;
supportsLockingWithOuterJoin = true;
forUpdateClause = "WITH RR USE AND KEEP UPDATE LOCKS";
if (maj >=9)
supportsXMLColumn = true;
}
// platform specific settings
switch (db2ServerType) {
case db2ZOSV8xOrLater:
// DB2 Z/OS
characterColumnSize = 255;
lastGeneratedKeyQuery = "SELECT IDENTITY_VAL_LOCAL() FROM "
+ "SYSIBM.SYSDUMMY1";
nextSequenceQuery = "SELECT NEXTVAL FOR {0} FROM "
+ "SYSIBM.SYSDUMMY1";
sequenceSQL = "SELECT SCHEMA AS SEQUENCE_SCHEMA, "
+ "NAME AS SEQUENCE_NAME FROM SYSIBM.SYSSEQUENCES";
sequenceSchemaSQL = "SCHEMA = ?";
sequenceNameSQL = "NAME = ?";
if (maj == 8) {
// DB2 Z/OS Version 8: no bigint support, hence map Java
// long to decimal
bigintTypeName = "DECIMAL(31,0)";
}
ignoreSQLExceptionOnSetQueryTimeout = true;
break;
case db2ISeriesV5R3OrEarlier:
case db2ISeriesV5R4OrLater:
lastGeneratedKeyQuery = "SELECT IDENTITY_VAL_LOCAL() FROM "
+ "SYSIBM.SYSDUMMY1";
nextSequenceQuery = "SELECT NEXTVAL FOR {0} FROM "
+ "SYSIBM.SYSDUMMY1";
validationSQL = "SELECT DISTINCT(CURRENT TIMESTAMP) FROM "
+ "QSYS2.SYSTABLES";
sequenceSQL = "SELECT SEQUENCE_SCHEMA, "
+ "SEQUENCE_NAME FROM QSYS2.SYSSEQUENCES";
sequenceSchemaSQL = "SEQUENCE_SCHEMA = ?";
sequenceNameSQL = "SEQUENCE_NAME = ?";
break;
}
}
/**
* Get the update clause for the query based on the
* updateClause and isolationLevel hints
*/
protected String getForUpdateClause(JDBCFetchConfiguration fetch,
boolean isForUpdate, Select sel) {
int isolationLevel;
// For db2UDBV81OrEarlier and db2ISeriesV5R3OrEarlier:
// "optimize for" clause appears before "for update" clause.
StringBuffer forUpdateString = new StringBuffer(
getOptimizeClause(sel));
try {
// Determine the isolationLevel; the fetch
// configuration data overrides the persistence.xml value
if (fetch != null && fetch.getIsolation() != -1)
isolationLevel = fetch.getIsolation();
else
isolationLevel = conf.getTransactionIsolationConstant();
if (isForUpdate) {
switch(db2ServerType) {
case db2ISeriesV5R3OrEarlier:
case db2UDBV81OrEarlier:
if (isolationLevel == Connection.TRANSACTION_SERIALIZABLE)
forUpdateString.append(" ").append(forUpdateClause);
else
forUpdateString.append(" ").append(forUpdate)
.append(" ").append(withRSClause);
break;
case db2ZOSV8xOrLater:
case db2UDBV82OrLater:
if (isolationLevel == Connection.TRANSACTION_SERIALIZABLE) {
forUpdateString.append(" ").append(forReadOnlyClause)
.append(" ").append(withRRClause)
.append(" ").append(useKeepUpdateLockClause);
} else {
forUpdateString.append(" ").append(forReadOnlyClause)
.append(" ").append(withRSClause)
.append(" ").append(useKeepUpdateLockClause);
}
break;
case db2ISeriesV5R4OrLater:
if (isolationLevel == Connection.TRANSACTION_SERIALIZABLE) {
forUpdateString.append(" ").append(forReadOnlyClause)
.append(" ").append(withRRClause)
.append(" ").append(useKeepExclusiveLockClause);
} else {
forUpdateString.append(" ").append(forReadOnlyClause)
.append(" ").append(withRSClause)
.append(" ").append(useKeepExclusiveLockClause);
}
break;
}
}
}
catch (Exception e) {
if (log.isTraceEnabled())
log.error(e.toString(),e);
}
return forUpdateString.toString();
}
public boolean isDB2UDBV82OrLater() {
return (databaseProductVersion.indexOf("SQL") != -1
|| databaseProductName.indexOf("DB2/") != -1)
&& ((maj == 8 && min >= 2) || (maj >= 9));
}
public boolean isDB2ZOSV8xOrLater() {
return (databaseProductVersion.indexOf("DSN") != -1
|| databaseProductName.indexOf("DB2/") == -1)
&& maj >= 8;
}
public boolean isDB2ISeriesV5R3OrEarlier() {
return (databaseProductName.indexOf("AS") != -1
&& ((maj == 5 && min <=3) || maj < 5));
}
public boolean isDB2ISeriesV5R4OrLater() {
return databaseProductName.indexOf("AS") != -1
&& (maj >=6 || (maj == 5 && min >=4));
}
public boolean isDB2UDBV81OrEarlier() {
return (databaseProductVersion.indexOf("SQL") != -1
|| databaseProductName.indexOf("DB2/") != -1)
&& ((maj == 8 && min <= 1) || maj < 8);
}
/** Get the version Major/Minor for the ISeries
*/
private void getProductVersionMajorMinorForISeries() {
// ISeries DBProdName DB2 UDB for AS/400
// (Toolbox)DBProdVersion 05.04.0000 V5R4m0
// ISeries DB2 UDB for AS/400
// (Native) V5R4M0
// new jcc DBProdVersion QSQ05040 or QSQ06010
if (databaseProductName.indexOf("AS") != -1) {
// default to V5R4
maj = 5;
min = 4;
int index = databaseProductVersion.indexOf('V');
if (index != -1) {
String s = databaseProductVersion.substring(index);
s = s.toUpperCase();
StringTokenizer stringtokenizer = new StringTokenizer(s, "VRM"
, false);
if (stringtokenizer.countTokens() == 3) {
String s1 = stringtokenizer.nextToken();
maj = Integer.parseInt(s1);
String s2 = stringtokenizer.nextToken();
min = Integer.parseInt(s2);
}
} else {
index = databaseProductVersion.indexOf('0');
if (index != -1) {
String s = databaseProductVersion.substring(index);
s = s.toUpperCase();
StringTokenizer stringtokenizer = new StringTokenizer(s, "0"
, false);
if (stringtokenizer.countTokens() == 2) {
String s1 = stringtokenizer.nextToken();
maj = Integer.parseInt(s1);
String s2 = stringtokenizer.nextToken();
min = Integer.parseInt(s2);
}
}
}
}
}
private void getProductVersionMajorMinor() {
// Incase JDBC driver version is lower than 3
// use following info to determine Major and Minor
// CLI vs JCC
// ZDBV8 DBProdName DB2 DB2
// DBProdVersion 08.01.0005 DSN08015
// ZDBV9 DB2 DB2
// 09.01.0005 DSN09015
// WinV9 DB2/NT DB2/NT
// 09.01.0000 SQL09010
// SolarisV9 DB2/SUN64
// SQL0901
// Linux DB2/LINUX DB2/LINUX
// 09.01.0000 SQL0901
if (databaseProductVersion.indexOf("09") != -1) {
maj = 9;
if (databaseProductVersion.indexOf("01") != -1) {
min = 1;
}
} else if (databaseProductVersion.indexOf("08") != -1) {
maj = 8;
min = 2;
if (databaseProductVersion.indexOf("01") != -1) {
min = 1;
}
}
}
protected String getOptimizeClause(Select sel) {
if (sel != null && sel.getExpectedResultCount() > 0) {
StringBuffer buf = new StringBuffer();
buf.append(" ").append(optimizeClause).append(" ")
.append(String.valueOf(sel.getExpectedResultCount()))
.append(" ").append(rowClause);
return buf.toString();
}
return "";
}
public OpenJPAException newStoreException(String msg, SQLException[] causes,
Object failed) {
if (causes != null && causes.length > 0)
msg = appendExtendedExceptionMsg(msg, causes[0]);
return super.newStoreException(msg, causes, failed);
}
/**
* Append exception information from SQLCA to the exsisting
* exception meassage
*/
private String appendExtendedExceptionMsg(String msg, SQLException sqle){
final String GETSQLCA ="getSqlca";
String exceptionMsg = new String();
try {
Method sqlcaM2 = sqle.getNextException().getClass()
.getMethod(GETSQLCA,null);
Object sqlca = sqlcaM2.invoke(sqle.getNextException(),
new Object[] {});
Method getSqlErrpMethd = sqlca.getClass().
getMethod("getSqlErrp", null);
Method getSqlWarnMethd = sqlca.getClass().
getMethod("getSqlWarn", null);
Method getSqlErrdMethd = sqlca.getClass().
getMethod("getSqlErrd", null);
StringBuffer errdStr = new StringBuffer();
int[] errds = (int[]) getSqlErrdMethd.invoke(sqlca, new Object[]{});
for (int i = 0; i < errds.length; i++)
errdStr.append(errdStr.length() > 0 ? ", " : "").
append(errds[i]);
exceptionMsg = exceptionMsg.concat( "SQLCA OUTPUT" +
"[Errp=" + getSqlErrpMethd.invoke(sqlca, new Object[]{})
+ ", Errd=" + errdStr);
String Warn = new String((char[]) getSqlWarnMethd.
invoke(sqlca, new Object[]{}));
if (Warn.trim().length() != 0)
exceptionMsg = exceptionMsg.concat(", Warn=" +Warn + "]" );
else
exceptionMsg = exceptionMsg.concat( "]" );
msg = msg.concat(exceptionMsg);
// for batched execution failures, SQLExceptions are nested
SQLException sqle2 = sqle.getNextException();
while (sqle2 != null) {
msg = msg.concat("\n" + sqle2.getMessage());
sqle2 = sqle2.getNextException();
}
return msg;
} catch (Throwable t) {
return sqle.getMessage();
}
}
public int getDb2ServerType() {
return db2ServerType;
}
protected void appendLength(SQLBuffer buf, int type) {
if (type == Types.VARCHAR)
buf.append("(").append(Integer.toString(characterColumnSize)).
append(")");
}
/**
* If this dictionary supports XML type,
* use this method to append xml predicate.
*
* @param buf the SQL buffer to write the comparison
* @param op the comparison operation to perform
* @param lhs the left hand side of the comparison
* @param rhs the right hand side of the comparison
* @param lhsxml indicates whether the left operand maps to xml
* @param rhsxml indicates whether the right operand maps to xml
*/
public void appendXmlComparison(SQLBuffer buf, String op, FilterValue lhs,
FilterValue rhs, boolean lhsxml, boolean rhsxml) {
super.appendXmlComparison(buf, op, lhs, rhs, lhsxml, rhsxml);
if (lhsxml && rhsxml)
appendXmlComparison2(buf, op, lhs, rhs);
else if (lhsxml)
appendXmlComparison1(buf, op, lhs, rhs);
else
appendXmlComparison1(buf, op, rhs, lhs);
}
/**
* Append an xml comparison predicate.
*
* @param buf the SQL buffer to write the comparison
* @param op the comparison operation to perform
* @param lhs the left hand side of the comparison (maps to xml column)
* @param rhs the right hand side of the comparison
*/
private void appendXmlComparison1(SQLBuffer buf, String op,
FilterValue lhs, FilterValue rhs) {
boolean castrhs = false;
Class rc = Filters.wrap(rhs.getType());
int type = 0;
if (rhs.isConstant()) {
type = getJDBCType(JavaTypes.getTypeCode(rc), false);
castrhs = true;
}
appendXmlExists(buf, lhs);
buf.append(" ").append(op).append(" ");
buf.append("$");
if (castrhs)
buf.append("Parm");
else
rhs.appendTo(buf);
buf.append("]' PASSING ");
appendXmlVar(buf, lhs);
buf.append(", ");
if (castrhs)
appendCast(buf, rhs, type);
else
rhs.appendTo(buf);
buf.append(" AS \"");
if (castrhs)
buf.append("Parm");
else
rhs.appendTo(buf);
buf.append("\")");
}
/**
* Append an xml comparison predicate. (both operands map to xml column)
*
* @param buf the SQL buffer to write the comparison
* @param op the comparison operation to perform
* @param lhs the left hand side of the comparison (maps to xml column)
* @param rhs the right hand side of the comparison (maps to xml column)
*/
private void appendXmlComparison2(SQLBuffer buf, String op,
FilterValue lhs, FilterValue rhs) {
appendXmlExists(buf, lhs);
buf.append(" ").append(op).append(" ");
buf.append("$").append(rhs.getColumnAlias(
rhs.getFieldMapping().getColumns()[0])).
append("/*/");
rhs.appendTo(buf);
buf.append("]' PASSING ");
appendXmlVar(buf, lhs);
buf.append(", ");
appendXmlVar(buf, rhs);
buf.append(")");
}
private void appendXmlVar(SQLBuffer buf, FilterValue val) {
buf.append(val.getColumnAlias(
val.getFieldMapping().getColumns()[0])).
append(" AS ").
append("\"").append(val.getColumnAlias(
val.getFieldMapping().getColumns()[0])).
append("\"");
}
private void appendXmlExists(SQLBuffer buf, FilterValue val) {
buf.append("XMLEXISTS('");
buf.append("$").append(val.getColumnAlias(
val.getFieldMapping().getColumns()[0])).
append("/*[");
val.appendTo(buf);
}
/**
* add CAST for a scalar function where operand is a param
*
* @param func original string
* @param target substring to look for
* @param asString
* @return updated string (func)
*/
private String addCastAsString(String func, String target,
String asString) {
String fstring = func;
if (func.indexOf(target) != -1)
fstring = Strings.replace(
func, target, "CAST(" + target + asString + ")");
return fstring;
}
/**
* add CAST for a function operator where operand is a param
*
* @param func function name
* @param val type
* @return updated string (func)
*/
public String addCastAsType(String func, Val val) {
String fstring = null;
String type = getTypeName(getJDBCType(JavaTypes.getTypeCode(val
.getType()), false));
if (String.class.equals(val.getType()))
type = type + "(" + characterColumnSize + ")";
fstring = "CAST(? AS " + type + ")";
return fstring;
}
/**
* Return the batch limit. If the batchLimit is -1, change it to 100 for
* best performance
*/
public int getBatchLimit() {
int limit = super.getBatchLimit();
if (limit == UNLIMITED) {
limit = defaultBatchLimit;
if (log.isTraceEnabled())
log.trace(_loc.get("batch_unlimit", String.valueOf(limit)));
}
return limit;
}
/**
* Return the correct CAST function syntax
*
* @param val operand of cast
* @param func original string
* @return a String with the correct CAST function syntax
*/
public String getCastFunction(Val val, String func) {
if (val instanceof Lit || val instanceof Param) {
if (func.indexOf("VARCHAR") == -1) {
func = addCastAsString(func, "{0}", " AS VARCHAR(" + varcharCastLength + ")");
}
}
return func;
}
/**
* Return the correct CAST function syntax
*
* @param val operand of cast
* @param func original string
* @param col database column
* @return a String with the correct CAST function syntax
*/
public String getCastFunction(Val val, String func, Column col) {
boolean doCast = false;
if (val instanceof Lit || val instanceof Param) {
doCast = true;
}
// cast anything not already a VARCHAR to VARCHAR
if (col.getType() != Types.VARCHAR) {
doCast = true;
}
if (doCast == true) {
if (func.indexOf("VARCHAR") == -1) {
func = addCastAsString(func, "{0}", " AS VARCHAR(" + varcharCastLength + ")");
}
}
return func;
}
public void indexOf(SQLBuffer buf, FilterValue str, FilterValue find,
FilterValue start) {
if (find.getValue() != null) { // non constants
buf.append("(LOCATE(CAST((");
find.appendTo(buf);
buf.append(") AS VARCHAR(1000)), ");
} else {
// this is a constant
buf.append("(LOCATE(");
find.appendTo(buf);
buf.append(", ");
}
if (str.getValue() != null) {
buf.append("CAST((");
str.appendTo(buf);
buf.append(") AS VARCHAR(1000))");
} else {
str.appendTo(buf);
}
if (start != null) {
if (start.getValue() == null) {
buf.append(", CAST((");
start.appendTo(buf);
buf.append(") AS INTEGER) + 1");
} else {
buf.append(", ");
start.appendTo(buf);
}
}
buf.append(") - 1)");
}
/**
* Cast the specified value to the specified type.
*
* @param buf the buffer to append the cast to
* @param val the value to cast
* @param type the type of the case, e.g. {@link Types#NUMERIC}
*/
public void appendCast(SQLBuffer buf, FilterValue val, int type) {
// Convert the cast function: "CAST({0} AS {1})"
int firstParam = castFunction.indexOf("{0}");
String pre = castFunction.substring(0, firstParam); // "CAST("
String mid = castFunction.substring(firstParam + 3);
int secondParam = mid.indexOf("{1}");
String post;
if (secondParam > -1) {
post = mid.substring(secondParam + 3); // ")"
mid = mid.substring(0, secondParam); // " AS "
} else
post = "";
// No need to add CAST if the value is a constant
if (val instanceof Lit || val instanceof Param) {
buf.append(pre);
val.appendTo(buf);
buf.append(mid);
buf.append(getTypeName(type));
appendLength(buf, type);
buf.append(post);
} else {
val.appendTo(buf);
String sqlString = buf.getSQL(false);
if (sqlString.endsWith("?")) {
// case "(?" - convert to "CAST(? AS type"
String typeName = getTypeName(type);
if (String.class.equals(val.getType()))
typeName = typeName + "(" + characterColumnSize + ")";
String str = "CAST(? AS " + typeName + ")";
buf.replaceSqlString(sqlString.length() - 1,
sqlString.length(), str);
}
}
}
/**
* Create an index if necessary for some database tables
*/
public void createIndexIfNecessary(Schema schema, String table,
Column pkColumn) {
if (isDB2ZOSV8xOrLater()) {
// build the index for the sequence tables
// the index name will the fully qualified table name + _IDX
Table tab = schema.getTable(table);
Index idx = tab.addIndex(tab.getFullName() + "_IDX");
idx.setUnique(true);
idx.addColumn(pkColumn);
}
}
String nullSafe(String s) {
return s == null ? "" : s;
}
}