//$Id: InformixDialect.java 15897 2009-02-04 23:14:05Z [email protected] $
package org.hibernate.dialect;
import java.sql.SQLException;
import java.sql.Types;
import org.hibernate.MappingException;
import org.hibernate.Hibernate;
import org.hibernate.dialect.function.VarArgsSQLFunction;
import org.hibernate.exception.JDBCExceptionHelper;
import org.hibernate.exception.TemplatedViolatedConstraintNameExtracter;
import org.hibernate.exception.ViolatedConstraintNameExtracter;
import org.hibernate.util.StringHelper;
/**
* Informix dialect.<br>
* <br>
* Seems to work with Informix Dynamic Server Version 7.31.UD3,
* Informix JDBC driver version 2.21JC3.
* @author Steve Molitor
*/
public class InformixDialect extends Dialect {
/**
* Creates new <code>InformixDialect</code> instance. Sets up the JDBC /
* Informix type mappings.
*/
public InformixDialect() {
super();
registerColumnType(Types.BIGINT, "int8");
registerColumnType(Types.BINARY, "byte");
registerColumnType(Types.BIT, "smallint"); // Informix doesn't have a bit type
registerColumnType(Types.CHAR, "char($l)");
registerColumnType(Types.DATE, "date");
registerColumnType(Types.DECIMAL, "decimal");
registerColumnType(Types.DOUBLE, "float");
registerColumnType(Types.FLOAT, "smallfloat");
registerColumnType(Types.INTEGER, "integer");
registerColumnType(Types.LONGVARBINARY, "blob"); // or BYTE
registerColumnType(Types.LONGVARCHAR, "clob"); // or TEXT?
registerColumnType(Types.NUMERIC, "decimal"); // or MONEY
registerColumnType(Types.REAL, "smallfloat");
registerColumnType(Types.SMALLINT, "smallint");
registerColumnType(Types.TIMESTAMP, "datetime year to fraction(5)");
registerColumnType(Types.TIME, "datetime hour to second");
registerColumnType(Types.TINYINT, "smallint");
registerColumnType(Types.VARBINARY, "byte");
registerColumnType(Types.VARCHAR, "varchar($l)");
registerColumnType(Types.VARCHAR, 255, "varchar($l)");
registerColumnType(Types.VARCHAR, 32739, "lvarchar($l)");
registerFunction( "concat", new VarArgsSQLFunction( Hibernate.STRING, "(", "||", ")" ) );
}
public String getAddColumnString() {
return "add";
}
public boolean supportsIdentityColumns() {
return true;
}
public String getIdentitySelectString(String table, String column, int type)
throws MappingException {
return type==Types.BIGINT ?
"select dbinfo('serial8') from systables where tabid=1" :
"select dbinfo('sqlca.sqlerrd1') from systables where tabid=1";
}
public String getIdentityColumnString(int type) throws MappingException {
return type==Types.BIGINT ?
"serial8 not null" :
"serial not null";
}
public boolean hasDataTypeInIdentityColumn() {
return false;
}
/**
* The syntax used to add a foreign key constraint to a table.
* Informix constraint name must be at the end.
* @return String
*/
public String getAddForeignKeyConstraintString(
String constraintName,
String[] foreignKey,
String referencedTable,
String[] primaryKey,
boolean referencesPrimaryKey) {
StringBuffer result = new StringBuffer( 30 )
.append( " add constraint " )
.append( " foreign key (" )
.append( StringHelper.join( ", ", foreignKey ) )
.append( ") references " )
.append( referencedTable );
if ( !referencesPrimaryKey ) {
result.append( " (" )
.append( StringHelper.join( ", ", primaryKey ) )
.append( ')' );
}
result.append( " constraint " ).append( constraintName );
return result.toString();
}
/**
* The syntax used to add a primary key constraint to a table.
* Informix constraint name must be at the end.
* @return String
*/
public String getAddPrimaryKeyConstraintString(String constraintName) {
return " add constraint primary key constraint " + constraintName + " ";
}
public String getCreateSequenceString(String sequenceName) {
return "create sequence " + sequenceName;
}
public String getDropSequenceString(String sequenceName) {
return "drop sequence " + sequenceName + " restrict";
}
public String getSequenceNextValString(String sequenceName) {
return "select " + getSelectSequenceNextValString( sequenceName ) + " from systables where tabid=1";
}
public String getSelectSequenceNextValString(String sequenceName) {
return sequenceName + ".nextval";
}
public boolean supportsSequences() {
return true;
}
public boolean supportsLimit() {
return true;
}
public boolean useMaxForLimit() {
return true;
}
public boolean supportsLimitOffset() {
return false;
}
public String getLimitString(String querySelect, int offset, int limit) {
if ( offset > 0 ) {
throw new UnsupportedOperationException( "query result offset is not supported" );
}
return new StringBuffer( querySelect.length() + 8 )
.append( querySelect )
.insert( querySelect.toLowerCase().indexOf( "select" ) + 6, " first " + limit )
.toString();
}
public boolean supportsVariableLimit() {
return false;
}
public ViolatedConstraintNameExtracter getViolatedConstraintNameExtracter() {
return EXTRACTER;
}
private static ViolatedConstraintNameExtracter EXTRACTER = new TemplatedViolatedConstraintNameExtracter() {
/**
* Extract the name of the violated constraint from the given SQLException.
*
* @param sqle The exception that was the result of the constraint violation.
* @return The extracted constraint name.
*/
public String extractConstraintName(SQLException sqle) {
String constraintName = null;
int errorCode = JDBCExceptionHelper.extractErrorCode(sqle);
if ( errorCode == -268 ) {
constraintName = extractUsingTemplate( "Unique constraint (", ") violated.", sqle.getMessage() );
}
else if ( errorCode == -691 ) {
constraintName = extractUsingTemplate( "Missing key in referenced table for referential constraint (", ").", sqle.getMessage() );
}
else if ( errorCode == -692 ) {
constraintName = extractUsingTemplate( "Key value for constraint (", ") is still being referenced.", sqle.getMessage() );
}
if (constraintName != null) {
// strip table-owner because Informix always returns constraint names as "<table-owner>.<constraint-name>"
int i = constraintName.indexOf('.');
if (i != -1) {
constraintName = constraintName.substring(i + 1);
}
}
return constraintName;
}
};
public boolean supportsCurrentTimestampSelection() {
return true;
}
public boolean isCurrentTimestampSelectStringCallable() {
return false;
}
public String getCurrentTimestampSelectString() {
return "select distinct current timestamp from informix.systables";
}
}
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